1 SimGrid (3.5) unstable; urgency=low
4 * New data container: setset (set of sets of elements)
5 * New module: mmalloc (mapped malloc)
6 * New function: xbt_dict_cursor_set_data()
7 * New function: xbt_fifo_get_last_item()
8 * Bug fix in xbt_dynar_shrink(): use the right element size
10 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr>
12 SimGrid (3.4.1) stable; urgency=low
14 The "Polishing easter eggs is probably a good idea" release.
15 This is a bug fixes release only.
19 * Fix a bug preventing the tasks from begin garbage collected.
22 * Fix a bug occuring when a host involved in a communication fails.
23 This was not detected properly by the other peer involved in the
24 communication. Now, it's reported as a network error.
27 * Warn the user about loop dependencies in data flow of DAX files
28 * Obey the control-flow dependencies of DAX files
31 * Add option "enable_smpi" allowing to not compile SMPI.
32 Probably useful for the (Mac) users experiencing a build error here
33 * Improve the detection of lua5.1 and ruby1.8
35 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Tus, 04 May 2010 28 16:11:16 +0100
37 SimGrid (3.4) stable; urgency=low
39 The "Easter in Cargese" release. Also known as (major changes):
41 * the "se habla Java, Ruby 話せます, fala-se Lua (and deaf-friendly)"
42 ~> bindings were greatly improved
43 ~> new tracing infrastructure for better visualization introduced
45 * the "Welcome to configury modernity" release.
46 ~> we switched from autotools to cmake, and improved our cdash
49 A more detailled list of changes follow (full detail in svn log).
51 Java Bindings: Various Cleanups
52 * (install java-gcj-compat-dev on debian-like to use them)
53 * Remove put/get: no need to export deprecated interface in Java
54 Use send/receive instead.
55 * Cleanup the examples and add a README per directory
56 * Remove example autoDestination (that's the only way to go now)
57 * Remove example explicitDestination (was a plain copy of basic)
58 * Make JniException a runtime exception, so that there is no need to
59 declare the fact that you may encounter such a beast. I guess that
60 nobody will ever want to survive such error.
61 * Create specific errors for each MSG case of failure:
62 host failure, transfer failure, timeout, task cancelled
63 * Cleanup the exceptions that may get thrown by each function
64 * Other internal cleanups in Java bindings. Performance still bad :/
65 Ruby and Lua Bindings: create them
66 * (install ruby1.8-dev/liblua5.1-0-dev on debian-like to use them)
67 * That's new and great, you should try them out.
68 Same functionalities than Java bindings, only even less polished
70 * Kill the useless "rate" argument of SD_task_get_execution_time()
71 Everyone used to provide -1 as a value, it was not used, and the
72 semantic of a possible use wasn't even clear.
73 * SD_SCHED_NO_COST: Constant to use as cost in SD_task_schedule()
74 either as comm costs or compute costs to mean that there is no
75 such thing for that specific task.
76 * Add a SD_task_set_name() function
77 * Fix SD_task_unschedule() on typed tasks
78 * Fix SD_task_get_execution_time() to return seconds, not flop*sec
79 * In DAX loader, accept useless 'level' attributes to <job> since
80 LIGO DAGs have them (seem to be to ease graphical representation).
82 * Add an example masterslave_mailbox.c using send/receive and not
83 the deprecated put/get interface.
84 * Kill the MSG_paje_output() function. It's a noop since 2 years.
85 * Kill MSG_WARNING and MSG_FATAL return codes: they were not used
87 * Rename MSG_TIMEOUT_FAILURE into MSG_TIMEOUT for sake of logic
88 (declare MSG_USE_DEPRECATED to still have the old name)
89 * Add a MSG_task_set_data() function
90 * About trace replay (see examples/msg/actions):
92 - Allow to work with splitted trace files for each process
93 Give the specific trace file as argument of each process,
94 and call MSG_action_trace_run(NULL)
95 You can still have one merged file for all processes.
96 - Fix implementation of collective operations
97 * Allow task_execute() on 0-sized tasks (closes #10063)
99 * This is the first release of SimGrid where SMPI is not considered
100 beta anymore (even if some corners should still be improved)
101 * Port over the new SIMIX_network submodule (internal refactoring)
102 * Basic support to log events as with SMPE (use --cfg=SMPE:1)
103 * Implement more missing elements of the standard:
105 - MPI_MAXLOC MPI_MINLOC + all associated datatype MPI_DOUBLE_INT,
107 - MPI_Address() MPI_Get_count() MPI_Type_free() MPI_Type_extent()
108 MPI_Scan() MPI_Get_processor_name()
109 - Added implementation of missing case for Alltoall (warning: it's
110 *not* the bruck variant from OpenMPI; based on Alltoallv instead)
111 - SMPI_MPI_Gather() SMPI_MPI_Gatherv() SMPI_MPI_Scatterv()
112 SMPI_MPI_Reduce_scatter() SMPI_MPI_Allgather()
113 SMPI_MPI_Allgatherv()
115 - MPI_Waitsome() was broken
116 - Allow relative includes in smpicc
117 - Command line cfg argument 'reference_speed' was ignored...
118 - Some functions did not properly lead to auto-benching of user code
119 - smpicc passes -O2 by default (just like openmpi one)
121 * add SIMIX_action_suspend() and SIMIX_action_resume() functions
122 * Bug fixes about timeouts during communications
123 * add SIMIX_message_sizes_output() as a pimple to write to file the
124 amount of messages per size. Use gnuplot to get histogram.
125 Pimple because that's the only user-visible function of simix,
126 defined directly in xbt.h (irk, sorry)
128 - Add a SIMIX_sem_get_capacity() function
129 - Fix interactions with processe resume/suspende
130 - release_forever() was stupidly broken
131 - Fix SIMIX_display_process_status() for processes in a semaphore
132 - Make SIMIX_sem_block_onto() user-visible
133 * Refactoring context stuff:
134 - Use pseudo-OOP for better modularity
135 - reimplement SIMIX_process_kill() without process_schedule() so
136 that the latter can take as invariant that it is called from
138 - Merge context_start into context_new for sake of simplicity
140 * Add a Vivaldi network model, coded live during SUD'10 ;)
141 * Rename configuration variables to start a hierarchy:
142 o cpu_model -> cpu/model
143 o network_model -> network/model
144 o workstation_model -> workstation/model
145 * New configuration variables:
146 o network/bandwidth_factor: correction to bandwith
147 o network/latency_factor: correction to latency
148 o netwotk/weight_S: correction to the weight of competing streams
149 * Add a long description to the models, that users can see with such
150 argument on the command line: --cfg=cpu/model:help
151 * --help-models display the long description of all known models
153 * config: add the ability to set a default value after registration
154 Does not override any previously set value (e.g. from cmd line)
155 * dict: allow to have integer key and data.
156 When so, you need to use the following functions
157 void xbt_dicti_set(xbt_dict_t dict, uintptr_t key, uintptr_t data);
158 uintptr_t xbt_dicti_get(xbt_dict_t dict, uintptr_t key);
159 void xbt_dicti_remove(xbt_dict_t dict, uintptr_t key);
160 In contrary to regular dicts, the key is not malloced before copy.
161 Mixing scalar and regular elements in the same dict is not tested
163 * Allow to use xbt_dynar_shrink() to expend the dynar instead
164 Tracing for Visualization:
165 * SimGrid is now instrumented in order to generate a trace file for
166 visualization analysis: to use it, need to compile SimGrid with the
167 "tracing" option enabled, and instrument the program using SimGrid with
168 TRACE_start, TRACE_category, TRACE_msg_set_task_category and TRACE_end
169 (among other functions).
170 * The instrumentation only traces the platform utilization for now
171 * Documentation to use the tracing functions and how to analyze the
172 traces with the Triva tool is written.
173 * More information about: SimGrid FAQ (in the section Tracing Simulations
176 * We moved to cmake as default build system. Autotools support will
177 be dropped soon. Check the FAQ for more info about how to use it.
178 * Greatly improved our cdash/ctest interactions
179 Check http://cdash.inria.fr/CDash/index.php?project=Simgrid
180 * Added memory checking tests with valgrind; lot of memleak fixing.
181 This may be the first release of simgrid with so few memory issues
182 * Added code coverage tests.
183 Our coverage is still improvable, but at least we see it on cdash.
185 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Wed, 28 Apr 2010 28 17:11:16 +0100
187 SimGrid (3.3.4) stable; urgency=low
189 The "Desktop Grid needs love too" release (also called Xmas release).
192 * Major speedup in the maxmin system solving by using lazy evaluation
193 Instead of solving completely the maxmin system at each iteration,
194 only invalidate (and recompute) the modified parts.
195 This new feature is enabled in default models but you can try to
196 turn it on with "--cfg:maxmin-selective-update=1" for other models.
197 * Cas01 IMproved as default CPU model
198 This CPU model is the same Cas01 model, but it uses the
199 maxmin-selective-update flag and a heap structure to manage
200 actions on SURF kernel.
201 It reduces the complexity to find the next action to finish and,
202 consequently, it's faster than the old Cas01.
203 This is the new default CPU model (Cas01).
204 * Rename the old Cas01 model to Cas01_fullupdate
205 Keep the old cpu model Cas01 with the new name of Cas01_fullupdate.
206 Use "--cfg=cpu_model:Cas01_fullupdate" to use the old default CPU model.
207 * CpuTI (CPU Trace Integration)
208 A new CPU model whose objective is simulate faster when using
209 availability trace files.
210 Instead of using a full featured, over engineered maxmin system for
211 CPU modeling, this model does the pre-integration of traces files
212 to calculate the amount of CPU power available, and so, executes
213 faster than the old CPU models.
214 Use "--cfg=cpu_model:CpuTI" to change to this CPU model.
215 * Use LV08 as default network model since it gives better accuracy
216 for small messages and shouldn't change things for big ones.
217 Use --cfg=network_model:CM02 to get the previous behavior.
220 ******************************************
221 *DO NOT MIX 3.3.4 RESULTS WITH OLDER ONES*
222 ******************************************
223 * The new CPU model may changes simulations!
224 The point is that events occurring at the exact same timestamp
225 are not scheduled in the same order with the old and new
226 version. This may be enough to completely change the execution
227 of simulations in some cases.
228 * The new network model will change simulations!
229 This new model is more realistic than the previous one, so you
230 should consider redoing your old experiments with this model.
231 Sorry for the inconvenience.
234 * Introduce the supernovae compilation mode
235 When compiled that way, the whole SimGrid (or almost) is put in a
236 single compilation unit and compiled in one shoot.
237 This is to help gcc which has difficulties to inline stuff from one
239 The speedup seem to be above 15%, althrough more tests are needed on
240 amd64 to confirm that gain.
243 * Port of MSG's mailbox on top of SIMIX network
244 The put/get mechanism was greatly simplified on the way.
247 * New SIMIX network module. Provides:
248 - Mailbox: rendez-vous mecanism to find with who you want to speak
249 - Synchronous send/recv: easier and hopefully faster since the
250 logic is handled in the maestro process directly now
251 - Asynchronous send/recv: you dreamt of it? It's here now
252 Too bad that nobody cared enough to propagate the change to MSG.
253 * Add semaphores as SIMIX synchronization mechanism.
256 * new function SD_daxload(char*) to load a DAX file
257 (see http://vtcpc.isi.edu/pegasus/index.php/WorkflowGenerator)
258 * Introduce typed tasks. Specify its kind and cost at creation.
259 At scheduling, just give where it should be placed, and the cost
260 for each involved resource is automatically computed.
261 Existing constructors so far (more to come of course):
262 - SD_task_create_comm_e2e() for end-to-end communication
263 - SD_task_create_comp_seq() for sequential computation
264 Use SD_task_schedulev() / SD_task_schedulel() to schedule them.
265 * new function SD_task_dump() for debuging display
266 * new function SD_task_dotty(task,FILE*) writing to file the info
267 about the task in dotty format
268 * SD_task_dependency_exists() can now cope with having one of its
269 arguments NULL. If so, it tests whether the other argument has any
271 * Add getters on list of preceding/following tasks:
272 SD_task_get_parents(task) and SD_task_get_children(task)
273 * Add getters on amount of workstations and list:
274 SD_task_get_workstation_count(t) and SD_task_get_workstation_list(t)
275 * Add getter on task kind: SD_task_get_kind(task)
276 * Update the start_time and finish_time of tasks on completion/failure
277 * Bugfix: Remove task from state swags when destroyed
280 * New function: void gras_cpu_burn(double flops) -- a simple CPU burner
283 * New function: xbt_dynar_dopar(dynar,fun) to map a function over the
284 dynar with one separate thread per value of the dynar.
285 * Change the prototype of xbt_thread_create(), sorry.
286 Added a boolean parameter indicating whether we want to join this
287 thread (used in SG only for now)
288 * Implement xbt_thread_join and xbt_thread_yield in SG also.
291 * GTNetS wrappers should now be usable again (and betterly tested too)
292 * Fix a major regression from 3.2 where the timeout provided to
293 MSG_task_put_with_timeout() was used as absolute time before which
294 the comm should be done.
295 * Start to fix the <cluster> tag.
296 - Internal links should be good now (beside of the loopback, which
297 use the private link instead)
298 - paths to the external world is still rather broken
299 - the <route:multi> tag is just broken. Actually that's brain-dead.
300 We need sth like <route:multi src="myCluster" dst="$*-${myCluster}">
301 to make it less stupid
302 ** Check your platform with teshsuite/simdag/platforms/flatifier **
303 * Fix a source-level compatibility glitch from 3.2: after defining
304 MSG_USE_DEPRECATED, you can use the old name
305 MSG_task_put_with_time_out() for MSG_task_put_with_timeout()
306 * Allow to compile from the SVN with automake 1.11
307 * Fix some problems when using the "start_time" tag in deployment XMLs.
308 * Fix #8569: XBT/synchro.h has redundant declarations
309 * Fix #8563: MSG return values and exceptions
310 Introduce a MSG_TIMEOUT_FAILURE return code and use it consistently.
311 * Integrate patch #8636: Obey DESTDIR when installing documentation.
312 Thanks to Robson Peixoto.
313 * Fix a vicious bug in dictionaries inducing that some elements were
314 not freed on xbt_dict_free()
316 Portability report of this version:
317 * Main portability targets:
318 - linux (ubuntu (804/810/910) /debian (4/5/testing) /fedora (core11))
320 - mac leopard on i386
321 Known problems: http://cdash.inria.fr/CDash/index.php?project=Simgrid
322 but nothing critical.
323 * Other platforms: windows, AIX and others were not tested for this release
325 Timing report of this version:
326 * Lazy evaluation brings arbitrary speedup (ie, speedup depending on
327 scenario parameters). From 8h to a few seconds in desktop grid settings.
328 * Supernovae brings about 25% speedup on i386.
330 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Thu, 24 Dec 2009 19:07:39 +0100
332 SimGrid (3.3.3) stable; urgency=low
334 The "Need for Speed" release.
336 The timings done to validate the 3.3.2 were faulty.
337 Instead of being 5% faster, it was 15% slower (compared to 3.3.1).
339 The problem was a conversion from a manually handled vector to
340 xbt_dynar_t on the critical path.
341 xbt_dynar_foreach calls functions, inducing stack management crap.
343 We inlined these functions and xbt_dynar_foreach is now breath taking.
344 We also inlined xbt_swag_belong on the way.
346 Here are some approximate speedup measurements (on master/slaves
347 simulations lasting between 10s and 20s each):
348 3.3.1 -> 3.3.2: about same performance
349 3.3.2 -> 3.3.3: 40% speedup
350 3.3.1 -> 3.3.3: 40% speedup
351 3.3.1 with inline patch -> 3.3.3: 30% speedup
353 Our reading is that the refactoring which occurred in 3.3.2 made us
354 suffer much more from the xbt_dynar_foreach low performance, but
355 once we solved this, this refactoring proved to be very performance
356 effective. From the 40% speedup, somehow, 10% are due to the
357 inlining and 30% to the refactoring.
359 That's a pitty that gcc cannot inline functions placed in other files
360 alone. We have to choose between:
361 - break the encapsulation (by putting private data structures and
362 accessors in headers files to help gcc)
363 - live with low performance
364 - switch to a decent compiler such as icc (not quite possible).
366 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Thu, 20 Aug 2009 21:21:33 +0200
368 SimGrid (3.3.2) stable; urgency=low
370 The "Simplicity does not preceed complexity, but follows it" release.
372 The main contributors of this release were (lexical order):
373 Silas De Munck, Stéphane Genaud, Martin Quinson, Cristian Rosa.
376 * Extract the routing logic into its own object.
377 (was dupplicated in network.c and workstation_LV07.c;
378 Allows to implement other ways of storing that info)
379 => kill now useless network_card concept
380 - Use dynar to represent routes (instead of void** + int*)
381 - kill link_set (use surf_network_model->resource_set instead)
382 - Add a command-line option to choose the routing schema to use
383 - Add three new models:
384 * Floyd (shortest path computed at initialization)
385 * Dijikstra (shortest path recomputed all the time)
386 * Cached Dijikstra (shortest path computed on need)
387 All these models where contributed by Silas De Munck, and are
388 described in his ICCS09 paper.
390 * Simplify model declaration
391 (less redirections, less function to write when defining a model)
392 - Factorize stuff between models:
395 surf_model_resource_set(model)
396 surf_model_resource_by_name(model, name)
397 - Unify the types of models in s_surf_model_t (using an union)
398 - Embeed fields of common_public directly into s_surf_model_t
399 - Rename model methods:
400 action_free ~> action_unref
401 action_change_state ~> action_state_set
402 action_get_state ~> action_state_get
403 - Change model methods into functions :
404 (model)->common_public->action_use ~> surf_action_ref
406 * Implement a generic resource; use it as ancestor to specific ones
407 (allows to kill duplicated code in models)
408 Drawback: timer command don't need no name nor properties;
409 workstation_CLM03 don't need no properties
410 (but I guess we can live with those few bytes wasted)
412 * Improve the action object model
413 - implement a constructor avoiding dupplicated code about field
414 initialization in generic_action part.
416 * Kill the SDP model: it has an external dependency, is deprecated
417 in flavor of modern lmm models, and didn't compile since a while
420 * Relocation of the context module from XBT to SIMIX.
421 (the context were decoupled from the simix processes, duplicating a lot of code)
422 => a lot of code was factorized
423 - less overhead is introduced during scheduling
424 - simpler API for the context factory
425 - the logic for process creation,destruction and manipulation was simplified
426 * Simplification of the s_smx_process_t data structure.
427 => accesing the simix level data associated to a process is faster now,
428 and the code is a lot more readable.
431 * Implement some more MPI primitives:
432 MPI_Bcast, MPI_Waitany, MPI_Waitall, MPI_Reduce, MPI_Allreduce, MPI_Scatter, MPI_Sendrecv, MPI_Alltoall
433 -implementation: Bcast: flat or 2-ary tree (default),
436 Allreduce: Reduce then Bcast
437 Alltoall: "basic_linear" if data per proc < 3Kb, "otherwise pairwise".
438 Not yet implemented: "Bruck" for data per proc < 200b and comm size > 12
439 Alltoallv: flat tree, like ompi
441 * Add support for optimized collectives (Bcast is now binomial by default)
442 * Port smpirun and smpicc to OS X
445 * Kill SD_link_get_properties: hard to maintain and makes very little sense
446 Shout out if you used it.
449 * Display the list of still queued messages in SG mode when existing
453 * Add xbt_set_get_by_name_or_null() [Silas De Munck]
454 * Add xbt_graph_node_get_outedges() [Silas De Munck]
455 * Add xbt_str_from_file(FILE*)
456 * Add xbt_dict_get_key achieving a linear reverse search
457 * Remove the context module
459 Portability report of this version:
460 * Main portability targets:
461 - Linux(debian)/x86/context
462 - Linux(debian)/x86/pthreads
463 - Linux(debian)/amd64/context
464 - Linux(debian)/amd64/pthreads
465 On these, we still have the eratic breakages of gras/pmm and
466 amok/saturate_sg reported in previous version. We still think
467 that the tests are the cause of the fault, not the tested code.
469 - Mac OSX Leopard/x86/context
470 Still false negative in tesh autotesting.
471 Smpi still fails, but this time because readlink does not accept -f
472 Everything seems to work properly beside of that.
475 - AIX version 5.3 (only tested contexts this time)
476 Smpi still fails there because mktemp is not installed.
477 Everything seems to work properly beside of that.
479 I managed to compile it for the first time, but several breakages.
480 Won't delay the release for this exotic platform.
482 * Windows: it's still lagging behind. If you want to help, please
485 Timing report of this version:
486 This version seem to be more than 5% faster than 3.3.1 (on linux
487 64bits with contextes). The gain is less than expected, we are
488 investigating this for next release.
490 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Wed, 19 Aug 2009 17:07:12 +0200
492 SimGrid (3.3.1) stable; urgency=low
495 * Implement a --cfg-help to show existing configuration variables
496 * Build chain do not require doxygen in maintainer mode
499 * fix a bug on struct sizeof computation, which prevented the
500 exchange of arrays of structs in some conditions
501 - added a regression test about this in datadesc_usage
502 * Allow the exchange of 0-long dynamic vectors.
503 - for that, use -1 as indicator of dynamic size instead of 0
504 - This implied to change any size from unsigned long to long,
505 reducing a bit communication abilities, but I guess that with
506 64bits being quite common, this is more than enough.
507 - This also induce a protocol change, thus bumping network protocol
508 version from 0 to 1 (if we have external users, we have to get
509 clean on that point too ;)
510 - added two regression tests about this in datadesc_usage
511 * Be more verbose when propagating local exceptions
512 This helps debugging.
513 * Display the status of simulated processes when receiving SIGINT in
517 * Allow to control the simulation from a trace file.
518 New functions MSG_action_register() and MSG_action_trace_run()
519 The first one allows to associate a function execution to each
520 kind of action while the second one parses a trace file and
521 triggers the corresponding actions within the system.
522 For now, only a toy example is provided in examples/msg/actions
523 * Add an exemple of process migration in examples/msg/migration
524 * Fix a bug in task exchange which broke MSG_task_get_sender()
525 Add a teshsuite regression test for that.
526 [Bug: if MSG_task_get_sender() is called after sender exit,
528 * Fix a bug which prevented suspend/resume to work properly
529 * Display the status of simulated processes when receiving SIGINT
530 This fixes a regression of v3.3. due to the introduction of SIMIX
531 * Bug fixing in failure management:
532 - trace could not start by a failure at time 0
533 - failure during communications were not working
536 * Add SIMIX_process_set_name() to change the name of the current
537 process in the log messages.
538 * Store smx_hosts in a dict since we only retrieve them by name
539 * Move the configuration infrastructure to surf
542 * Move the configuration infrastructure to surf
545 * Massive internal cleanups:
546 - Store internal structures on processes instead of hosts (allows
547 to have more than one process per host, in addition of being more
549 - Cleanup the initialization/finalization process
550 - Kill a whole bunch of unneeded synchronization:
551 processes run in exclusive manner within the simulator
552 - Move queues from global tables to process data fields
554 - now accept -platform and -hostfile arguments
555 - Pass the right rank value to processes according to the hostfile
556 * Compile the examples by default, and use them as regression tests
557 * Implement MPI_Wtime()
558 * Change the reference speed to a command line option
561 * TCP_gamma can now be specified as command line option using
562 --cfg=TCP_gamma:10000000.0
563 * Change the --surf-path cmd line option into --cfg=path:
566 * Also include strbuff from xbt.h public header
567 * xbt_ex_display(): do not free the exception after displaying
568 This allows to do more with the given exception afterward.
569 Users should call xbt_ex_free() themselves.
573 Portability report of this version:
574 * Main portability targets:
575 - Linux(debian)/x86/context
576 - Linux(debian)/x86/pthreads
577 - Linux(debian)/amd64/context
578 - Linux(debian)/amd64/pthreads
579 These targets fail about 1/10 of times on gras/pmm, but we believe
580 that this is because of the test, not because of simgrid.
581 amok/saturate_sg fails even more rarely, and the test may not be
584 - Mac OSX Leopard/x86/context
585 The test suite still spits tons of errors because some obscure
586 force prevents us from removing the temporary directories
587 arguing that they still contain some metadata I've never heard of.
588 Smpi fails because seq is not installed.
589 Everything seems to work properly beside of that.
592 - AIX version 5.3 (both contexts and pthread)
593 Smpi still fails there because mktemp is not installed.
594 XML inclusions seems rosty on AIX.
596 * Windows: it's still lagging behind. If you want to help, please
599 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Sat, 27 Jun 2009 00:14:30 +0200
601 SimGrid (3.3) stable; urgency=high
605 * JAVA BINDINGS for MSG (you dreamt of them? We made them)
608 * Introduce the SIMIX module: factorize code between MSG and GRAS.
611 Until now, GRAS were using MSG as an interface to SURF. It was
612 quite difficult because both interface have several differences
613 (MSG channels vs GRAS sockets were the most notable point).
615 This also opens the gate to SMPI (which should occur soon) and speed
616 up simulations by to 40% (even if it were not the main goal).
618 **************************************
619 *DO NOT MIX 3.2 RESULTS WITH 3.3 ONES* Simix may changes simulations!
620 **************************************
621 The point is that events occuring at the exact same timestamp are
622 not scheduled in the same order with the old and new version. This
623 may be enough to completely change the execution of simulations in
624 some cases. Sorry for the inconvenience.
626 * Cleanup and upgrade the XML format to push further scalability
627 issues (check http://hal.inria.fr/inria-00256883/ for more info)
629 * Improve the testing infrastructure with tesh. Now a very large part of
630 the code is tested not only by being run but also by checking that the
631 output match an expected output [Mt].
633 * Move on to FleXML v1.7 for the embeeded XML parsers. This version
634 is really less memory-demanding, which should allow you to use
635 larger files in SimGrid [AL].
637 * Inform valgrind about our contextes, so that it becomes usable
638 with the default (and more effecient) version of SimGrid
639 [contributed by Sékou Diakite, many thanks]
642 * Introduce a listener thread in charge of receiving incomming
643 messages from the network. It allows to overlap communication and
644 computation but most notably, it removes some stupid deadlocks due
645 to the fact that so far, a process could not send and receive at
646 the same time. This made most non trivial communication schema
648 * Convert the PIDs from long int to int to match the MSG ones (and
650 * New function: gras_agent_spawn() to launch a new process on
651 current host. Only working in simulation for now. [Mt]
652 * New function: gras_os_hostport() returning a constant form (ie,
653 not needing to be freed) of "gras_os_hostname():gras_os_myport()"
656 * Make the backtrace of exceptions more human readable [Mt]
657 * New module: xbt/str [Mt]
658 a ton of string utility functions (split, join, printf to a newly
659 allocated buffer, trim, etc)
660 * New module: xbt/hash [Mt]
661 SHA1 hashing algorithm (more to come if needed)
662 * New module: xbt/synchro [Mt]
663 synchronization tools (mutex and conditions) working the same way
664 in simulation and in real life (mainly useful for GRAS, but not
666 * New module: xbt/queue [Mt]
667 classical producer/consumer synchronization scheme
668 * xbt_dynar_new_sync() creates a synchronized dynar. All access
669 (using the classical functions will get serialized) [Mt]
670 * Make dictionary internal table dynamic. No need to specify its size
671 anymore; functions xbt_dict_new_ext() and xbt_dict_hashsize_set()
673 * Make sure the log channels are organized as a tree under windows
674 (because of ANSI C compatibility issue, any channel were child of
678 * Cleaned many thing in surf and fixed a few bugs [AL].
679 * Add a nice command line configuration mechanism to compose models [AL].
680 * Add a new model for parallel tasks (ptask_L07) that is less buggy than
681 the previous one (KCCFLN05). It relies on something that looks like
682 a max-min sharing mechanism but cannot be written as such. A new solver
683 was thus designed [AL].
684 * Add a new solver to lmm. Based on Lagrange optimization and
685 gradient-based descent, it enables to efficiently maximise systems s.a
687 sum f_i(x_i) s.t Ax<= b with A_{i,j}>=0 and f_i a concave function.
689 This solver enables to propose two new network models for TCP Reno and
690 TCP Vegas based on Low's work. These models still need to be fully
691 tested though [Pedro Velho].
694 * Bug fix in SD_simulate. Now the time bound given as argument is
696 * Use the new parallel task model (ptask_L07) as default.
697 * Use the SURF command line configuration mechanism.
698 * 0-size tasks (for synchronization) should now work.
700 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Sun Apr 12 05:20:36 CEST 2009
702 SimGrid (3.2) stable; urgency=high
706 We still experience issues on this platform, but we believe that at
709 GRAS API BREAKAGE (for simplification purpose, sorry):
710 * the gras_msgtype_by_name is not used anymore. Instead of
711 gras_msg_send(toserver, gras_msgtype_by_name("request"), &request);
712 you can write (and must)
713 gras_msg_send(toserver, "request", &request);
714 - If you still want to pass a gras_msgtype_t to the function (to cache
715 the type and avoid the lookup time), use the gras_msg_send_() variant.
716 - Impacted functions:
717 gras_cb_register, gras_cb_unregister, gras_msg_send, gras_msg_wait,
718 gras_msg_rpccall, gras_msg_rpc_async_call, gras_msg_wait_ext
719 * The callbacks are now expected to return 0 when everything went well
720 (just like the main() function)
722 GRAS new features and improvements:
723 * New module mecanism where user code can use per process globals [Mt]
724 This is similar to gras_userdata_*() functions, but for libraries. It
725 factorize some code developped over and over in the examples and AMOK.
726 It has still to be documented and used (only amok/peermanagement is
728 * Fix a vicious bug in the TCP buffering mecanism which leaded to message
729 loss when they were small enough to fit into the buffer and sent quickly
730 enough so that they can all get received in one shoot.
731 * gras_datadesc_by_name and gras_msgtype_by_name: now raise an exception
732 if not found. Use the *_or_null() variant for the old semantic.
733 * In gras_msg_handle, do not discard messages without callback.
734 They are probably messages to be explicitly awaited later (ie, proofs of
735 mis-synchronization in userland since they are sent before being awaited)
737 * gras_socket_meas_send/recv: semantic changed!
738 The numerical arguments used to be (1) the total amount of data to send
739 and (2) msg_size. This was changed to (1) msg_size and (2) amount of
740 messages. This was need for the fool willing to send more than MAXINT
741 bytes on quite fat pipes.
744 * Do really rename the hostmanagement module to peermanagement. [Mt]
745 Ie, rename functions from amok_hm_* to amok_pm_*. This breaks the API,
746 but this is rather new and this was documented in the module
747 documentation (poor excuses, I admit)
748 * Bandwidth measurement semantic changed! This follows the changes to
749 gras_socket_meas_send/recv explained above.
752 * A sequential mode has been added to the workstations. When a workstation
753 is in sequential mode, it can execute only one task, and the other tasks
754 are waiting in a FIFO. [Christophe Thiery]
757 * The KCCFLN05 workstation model now handles parallel tasks. It is the
758 model for SIMDAG. [Christophe Thiery]
759 * Bug fix in the maxmin solver: Some values were close to 0 instead of
760 equal to 0, which caused some bad behaviors in
761 saturated_constraint_set_update. I now use a threshold mechanism like in
765 * When running manually src/testall, you select specific units [Mt]
766 testall is the result of our cunit mecanism, and should replace all
767 the scripty thingy around since bash don't run easily on billware.
769 * A mallocator system has been added. [Christophe Thiery]
770 Mallocators allow you to recycle your unused objects instead of freeing them
771 and allocating new ones.
773 Documentation update:
774 * FAQ reworking + New FAQs:
775 - "Valgrind spits tons of errors!" [Mt]
776 - "How to repport bugs" [Mt]
777 - "Cross-compiling a Windows DLL of SimGrid from Linux" [Mt]
778 - "What is the difference between MSG, SimDag, and GRAS?" [Mt]
779 - Communication time measurement within MSG [AL]
780 - I experience weird communication times when I change the latency [AL]
783 - an introduction to the framework and to the used communication model
784 - an initiatic tour introducing the most proheminent features:
786 . Lesson 0: Installing GRAS
787 . Lesson 1: Setting up your own project
788 o Part 2: Message passing
789 . Lesson 2: Exchanging simple messages
790 . Lesson 3: Passing arguments to the processes (in SG)
791 . Lesson 4: Attaching callbacks to messages
792 . Lesson 5: Using globals in processes
793 . Lesson 6: Logging informations properly
794 . Lesson 7: Using internal timers
795 . Lesson 8: Handling errors through exceptions
796 . Lesson 9: Exchanging simple data
797 . Lesson 10: Remote Procedure Calling (RPC)
798 . Lesson 11: Explicitely waiting for messages
799 . Recapping of message passing features in GRAS
800 - A HOWTO section containing:
801 o HOWTO design a GRAS application
802 More are due, of course. They will come latter. In the meanwhile, you can
803 check the examples which are still here.
805 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Fri Mar 16 21:11:46 CET 2007
807 SimGrid (3.1) stable; urgency=high
811 There was a stack corruption somewhere, visible only when optimizing
812 with these versions. [Vince]
815 * This is a NEW module! SimDAG (SD for short) is a revival of the old SG
816 module that enabled to play with Directed Acyclic Graphs. It is built
817 directly on top of SURF and provides an API rather close to the old
818 SG. Some old codes using SG are currently under rewrite to check that
819 all needful functions are provided. [Christophe Thiery]
822 * Complete rewrite of the KCCFLN05 workstation model. It is now an
823 extension of the classical CLM03 model that gracefully handles
824 failures. This is now the default model for MSG and GRAS. It doesn't
825 handle parallel tasks yet though. [AL]
826 * Bug fix: Weights were not correctly set in the network part.
827 WARNING: This may have resulted in incorrect results with simulations
828 where there are more than one flow on a given link. [AL]
831 * After a (long ?) discussion on simgrid-devel, we have decided that the
832 convention we had on units was stupid. That is why it has been decided
833 to move from (MBits, MFlops, seconds) to (Bits, Flops, seconds).
834 WARNING : This means that all previous platform files will not work as
835 such with this version! A warning is issued to ask users to update
837 A conversion script can be found in the contrib module of the CVS, under
838 the name contrib/platform_generation/surfxml_update.pl [MQ]
841 * Bug fix: Processes were started in reverse order, wrt deployment file.
842 WARNING: if your code relies on this bug, please fix it. [AL]
843 * Bug fix: Add a test in MSG_task_execute to stop whenever a task is
844 being executed on two different locations. [AL]
845 * Bug fix: Failures are now better supported thanks to Derrick's tests
846 (there was many failure situations I hadn't thought of and that weren't
847 correctly handled). [AL]
848 * New function: MSG_host_is_avail indicates you whether a given m_host_t
852 * New! a real RPC mecanism, as it ought to be since too long. [MQ]
853 Exception occurring on server-side are propagated back to client (!).
855 API CHANGE: the callback changed their prototype. Change:
856 int my_handler(gras_socket_t expeditor, void *payload_data) {
858 int my_handler(gras_msg_cb_ctx_t ctx , void *payload_data) {
859 gras_socket_t expeditor=gras_msg_cb_ctx_from(ctx);
861 * New! function: gras_msg_handleall to deal with all messages arriving
862 within a given period.
863 * New! function: gras_socket_server_range to get a server socket in a
864 range of port numbers (ease to avoid port number conflicts) [MQ]
865 * New! gras processes display their backtrace when they get a SIGUSR1
866 or when Ctrl-C is pressed. Use Ctrl-C Ctrl-C to exit.
867 Sweet to debug RL processes [MQ]
871 - Do not force experiment sizes to be expressed in kb, or it becomes
872 impossible to measure the latency this way (needs one byte-long tests)
873 WARNING: this changes the amok_bw_* function semantic. [MQ]
874 - Implements the link saturation stuff. [MQ]
875 * Peer management module:
876 New! module factorizing code that we wrote over and over [MQ].
879 * New module: cunit (my jUnit implementation in ansi C) [MQ]
880 - Test units are placed directly into the library code, they get extracted
881 automatically and placed into the src/testall binary.
882 - Convert most of the XBT tests to this system.
883 * New functions: xbt_dynar_getfirst_as() and xbt_dynar_getlast_as() [MQ]
884 * XML parsing: rewrote parts of flexml to enable multiple xml parsers to
885 live in the same C code. This required to change a little bit the API
886 of surfxml parsing but shouldn't be an issue for end-users. [AL]
887 * New module: sparse graph structure with basic algorithms (this is work
888 in progress and the API is not considered to be frozen yet). [AL]
889 * Display more information on backtraces: source line & function names are
890 now displayed just like valgrind does (rely on addr2line tool) [MQ]
891 * New function: xbt_backtrace_display(). Sweet while debuging [MQ]
892 * Reworked a little bit some #include statements to load only required
893 headers. Some user code that relied on SimGrid to include stdlib or
894 stdio may need to include it by themselves. [AL]
895 * Fixed xbt/log.h. A missing SG_BEGIN_DECL prevented compilation with
897 * Renamed xbt_host_t into xbt_peer_t since it betterly describes what I
898 meant. This breaks the API of AMOK and of xbt/config. Sorry about this,
899 but I guess that almost nobody used those parts. [MQ]
901 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Fri, 14 Jul 2006 01:32:27 +0200
903 SimGrid (3.0.1) stable; urgency=low
906 * Unfortunately, I had missed 5 misnamed functions:
907 xbt_fifo_item_t xbt_fifo_newitem(void);
908 void xbt_fifo_freeitem(xbt_fifo_item_t);
909 xbt_fifo_item_t xbt_fifo_getFirstItem(xbt_fifo_t l);
910 xbt_fifo_item_t xbt_fifo_getNextItem(xbt_fifo_item_t i);
911 xbt_fifo_item_t xbt_fifo_getPrevItem(xbt_fifo_item_t i);
912 They're now deprecated. Please use their new versions:
913 xbt_fifo_item_t xbt_fifo_new_item(void);
914 void xbt_fifo_free_item(xbt_fifo_item_t);
915 xbt_fifo_item_t xbt_fifo_get_first_item(xbt_fifo_t l);
916 xbt_fifo_item_t xbt_fifo_get_next_item(xbt_fifo_item_t i);
917 xbt_fifo_item_t xbt_fifo_get_prev_item(xbt_fifo_item_t i);
919 * Bugfix: really disconnect fifo items which are remove_item()ed [AL]
920 * Documentation: xbt_log module unmercifully reworked [MQ]
921 * Bugfix: there was a problem with the ending of contexts with
922 the pthread backend. It caused some weird deadlock or behavior
923 depending on the pthread implementation. [AL]
924 * Bugfix: get the exceptions raised in the simulator repport where
925 and why they come from when they are not catched in time [AL, MQ]
928 * Bugfix: Do repport the error when two non-connected hosts try to
929 exchange data (Thanks to Flavien for stumbling into this one) [AL]
932 * Add additionnal checkings on communications. Assert that two
933 communicating hosts are connected by a set of links... [AL]
936 * Add additionnal checkings on channel values in communication [AL]
937 * New: MSG_task_get_source to see on which host a task was generated [HC]
938 * New: int MSG_task_probe_from_host(int channel, m_host_t host): returns
939 the number of tasks waiting to be received on channel and sent
941 * New: MSG_error_t MSG_task_get_from_host(m_task_t * task, int channel, m_host_t host);
942 waits for the first task coming from a given host.. [AL]
944 GRAS new functionnalities: [MQ]
945 * Enhance the parsing macro to allow the size of multidimentional objects
946 to be given thru annotations.
947 * New example (and documentation): Matrix Multiplication a la RPC
948 (as when I was young!) and fix a bunch of bugs found on the way.
950 GRAS performance improvements: [MQ]
952 * Reduce the amount of cbps creation/destruction by making it static to
953 datadesc_send/recv() and using a (newly created) cbps_reset (based on
956 * Change libdata to a set so that we can search for stuff by ID (and thus
957 reduce the insane amount of dict lookups)
960 * Actually implement gras_datadesc_copy() so that we don't have to mimick
961 RL communication on top of SG since it's so uneffective.
962 It may also be used for inter-thread communication in RL, one day.
963 * Use gras_datadesc_copy() to exchange messages on top of SG
965 - improve message exchange performance on top of SG
966 - deprecate transport_plugin_sg.c:gras_trp_sg_chunk_send() & recv()
967 * Don't exchange on the network the size of the used part of buffer,
968 instead, specify the possible buffer size to read().
970 - reduces the amount of read/write calls (one pair per exchange)
971 - reduces the amount of exchanged data (the size)
972 - allows to retrieve all arrived data on receiver side, if we don't need
973 it right now (subsequent read will peek the buffer)
974 - allows the receiver to proceed with the begining of the stream before
975 everything is arrived
976 - make it possible to build an iov transport (using readv/writev)
978 - take care of the data with non-stable storage (like stacked data),
980 * If possible, TCP send uses vector I/O (when writev() is here)
981 - Don't use it for receive since we send data sizes and data on the
982 same stream, so we wouldn't be able to chain large amount of chunks
983 before having to flush the stuff to read the size.
984 * Rework the transport plugin mecanism to simplify it and reduce the
985 amount of pointer dereferencement when searching for the right function
988 * I guess that now, we do almost as few system calls as possible while
989 doing as few data copy as possible.
991 To improve it further, we could try to send all the sizes first and then
992 all the data (to use iov on receiving size), but it's only a partial
993 solution: when you have 2 dimensional data, the sizes of the second
994 dimension is data of the first dimension, so you need 3 streams.
996 I'm not sure the potential performance gains justify the coding burden.
998 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Fri, 21 Oct 2005 14:42:20 +0200
1000 SimGrid (3.00) stable; urgency=high
1003 * New! Give the possibility to hijack the surf parser and thus bypass
1004 MSG_create_environment and MSG_launch_application. Have a look at
1005 examples/msg/msg_test_surfxml_bypassed.c to see how it can be done.
1007 -- Arnaud Legrand <simgrid-devel@lists.gforge.inria.fr> Sat, 20 Aug 2005 23:25:25 -0700
1009 SimGrid (2.96) unstable; urgency=low
1014 * New! Exception handling with setjmp or such (code from OSSP ex) [MQ]
1015 This deprecates the xbt_error_t mecanisms.
1016 It modifies (simplifies) all XBT and GRAS API.
1017 MSG API keeps unchanged (exceptions raised by XBT are catched from
1018 within MSG and masked with existing error handling facilities)
1021 * New! Add a FATPIPE model. [AL]
1022 * New! Add a parallel task model. [AL]
1023 * New! Add automatically a loopback interface (in the default
1024 network model) if none was precised.
1027 * Bugfix: MSG_process_resume now works with the current running process.
1029 * New! Add MSG_parallel_task_create and MSG_parallel_task_execute. [AL]
1030 * Modification of MSG_task_get_compute_duration. Once a task has been
1031 processed, the value returned by this function is now equal to 0. [AL]
1032 * New! Add double MSG_task_get_remaining_computation(m_task_t task) and
1033 MSG_error_t MSG_task_cancel(m_task_t task). Add a state
1034 (MSG_TASK_CANCELLED) to MSG_error_t corresponding to the cancelation
1035 of a m_task. For now, MSG_task_cancel only works with computation
1037 * New! Add double MSG_get_host_speed(m_host_t h) that returns the speed
1038 of the processor (in Mflop/s) regardless of the current load on the
1040 * API Change: use proper naming convention for MSG_getClock and
1041 MSG_process_isSuspended: MSG_get_clock and MSG_process_is_suspended.
1043 * New! Add void MSG_task_set_priority(m_task_t task, double priority).
1044 This function changes the priority of a computation task. This priority
1045 doesn't affect the transfer rate. A priority of 2 will make a task
1046 receive two times more cpu power than the other ones. This function
1047 has been added to suit the needs of Nguyen The Loc and hasn't been that
1048 much tested yet. So if it fails, please report it and send me your code.
1050 * API Change: removed all functions and types that were marked "deprecated"
1051 since many months. Renamed MSG_global_init_args to MSG_global_init.
1053 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Mon, 8 Aug 2005 17:58:47 -0700
1055 SimGrid (2.95) unstable; urgency=low
1058 * Steal some nice code to GNU pth to fix context detection and usage [AL]
1059 * Cleanup in the xbt_config API; add configuration callbacks. [MQ]
1060 * Cleanup in the initialization API: the unused "defaultlog" is dead. [MQ]
1063 * Bugfix: Allow absolute paths for platform description files [MQ]
1064 * Bugfix: do free the variables after use. Leads to drastic performance
1066 * Implement max_duration (ie, timeouts) on resources [AL]
1069 * Implement MSG_config to configure MSG at runtime. xbt_cfg test on a real
1071 * Implement MSG_channel_select_from() to help GRAS now that SURF provide
1072 the needed support (timeouts) [AL]
1075 * Implement measurement sockets. You can now get the bandwidth between two
1076 hosts thanks to AMOK (see below). [MQ]
1077 * gras_datadesc_dynar() builds a dynar type descriptor, allowing to send
1078 dynar over the network (yeah) [MQ]
1079 * Real (even if simplistic) implementation of gras_os_myname() on RL [MQ]
1080 * simple/static token-ring example. [Alexandre Colucci and MQ]
1081 * Use MSG_channel_select_from() and remove the *slow* hack we had to put
1082 in place before [MQ]
1085 * Differentiate the types "char[22]" and "unsigned char[22]" in automatic
1086 type parsing. "short" and "long" modifiers were also ignored; other
1087 modifier (such as reference level) are still ignored. [MQ]
1088 * Embeed the buffer size within the buffer itself on SG. [MQ]
1089 That way, send() are atomic and cannot get intermixed anymore (at least
1090 the ones which are less than 100k; bigger messages still have the issue)
1091 * Array size pushed by the field, not by the field type (or each
1092 and every long int will push stuff to the cbps) [MQ]
1093 * use select() to sleep since it allows to portably sleep less than one
1096 GRAS (minor cleanups)
1097 * <project>.Makefile.local (generated from gras_stub_generator) |MQ]:
1100 * Type Callbacks now receive the gras_datadesc_type_t they work on as argument.
1101 * type category 'ignored' killed as it was never used and were difficult
1103 * whether a type can cycle or not is now a flag, leaving room for more
1104 flags (as "ignored", if we feel the need one day ;)
1105 * Rename raw sockets to measurement sockets since "raw" has another
1106 meaning in networking community.
1109 * Advanced Metacomputing Overlay Kit introduction. It is based over GRAS
1110 and offers features not belonging to GRAS but that most applications
1111 need. One day, it may be a set of plugins loadable at runtime.
1112 * New module: bandwidth
1113 bandwidth measurement between arbitrary nodes running this module. [MQ]
1115 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Thu, 30 Jun 2005 16:29:20 -0700
1117 SimGrid (2.94) unstable; urgency=low
1119 The first beta release of SimGrid 3 !
1123 * Update the main page and the FAQ. Adding references to gforge.
1126 * Add a gras_os_getpid function.
1129 * Add MSG_task_get_compute_duration() and MSG_task_get_data_size()
1130 * Extend the logs so that they also print PID, hostname, date, ... if
1132 * Convert the MSG example to the use of xbt_logs instead of PRINT_MESSAGE,
1133 and kill the old version which were in testsuite/
1134 * Rewrite tools/MSG_visualization/colorize.pl for using with logs instead
1138 * Add xbt_os_time(). As the rest of xbt/portability, this is not public
1139 for users. Instead, each programming environment (GRAS, MSG,...) use it
1140 when needed to provide such a feature to users.
1141 Don't shortcut the mecanism or you will also shortcut the virtualization
1142 you need on the simulator.
1146 * Cleanups in configury with regard to compile optimization/warning flags.
1147 Also add -fno-loop-optimize to any powerpc since it's the optimization
1148 killing gcc (< 3.4.0).
1149 * Doxygen cleanups: move MSG examples, kill the second Doxygen phase
1150 needed by MSG examples complications
1151 * Borrow configury beautifications from PHP
1154 * Bugfix: XBT_LOG_NEW_DEFAULT_CATEGORY now compiles without compiler
1155 warning (thanks loris for stumbling into this one).
1156 * Bugfix: stop loading private headers (gras_config.h) from the public
1160 * Change SIMGRID_INSTALL_PATH to GRAS_ROOT in Makefiles generated for user.
1161 * Rename gras_get_my_fqdn to gras_os_myname and implement it in the simulator
1162 RL would imply a DNS resolver, which is *hard* to do in a portable way
1163 (and therefore delayed).
1164 * Implement a real timer mecanism and use it in timing macros. This allows
1165 to avoid rounding errors and get a 0.000005 sec precision in timing
1166 macros. While I was at it, various cleanups:
1167 - allow to declare more than one timed section per file (fix a stupid bug)
1168 - move some private declaration to the right place
1169 - merge conditional execution and timing macros into emulation module
1170 - document the module
1171 - make sure the module cleanups its mess on gras_exit
1172 * Documentation improvements:
1173 - (new) how to compile applications using GRAS
1174 - (new) emulation support (timing macros)
1176 -- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr> Fri, 13 May 2005 10:49:31 +0200
1178 SimGrid (2.93) unstable; urgency=low
1180 Alpha 4 on the path to SimGrid 3 (aka the "neuf-trois" version)
1183 - Use Paje properly where used. Still to be sanitized properly.
1184 - Portability fix: Add an implementation of the contexts using pthread
1188 - Add xbt_procname(): returns the name of the current process.
1189 Use it to show the current process's name in all logging.
1191 - fix detection of older flex version and the reaction, since we do
1192 depend on modern ones (we use lex_destroy)
1193 - Better separation of SG and RL in the libs: remove all simulation code
1194 from libgras. As a result, this lib is now only 200k when stripped.
1195 Some of the xbt modules may also be duplicated (two sets and such) and
1196 should be cleaned/killed before SG3.
1197 - Insist on using xlC on AIX because of weird problems involving gcc there.
1198 - Cleanup the make remote stuff. This is now done by scripts
1199 tools/graspe-{master,slave} (GRAS Platform Expender). This is still
1200 mainly for our private use, but we're working on changing them to user
1203 - Bugfix: flush the socket on close only if there is some *output*.
1204 - Bugfix: flush idempotent when there's nothing to send (don't send size=0)
1206 - Add MSG_task_get_name. The task names are mainly for debugging purpose,
1209 -- SimGrid team <simgrid2-users@listes.ens-lyon.fr> Fri, 4 Mar 2005 14:32:37 -0800
1211 SimGrid (2.92) unstable; urgency=low
1213 Alpha 3 on the path to SimGrid 3
1217 - New! First try of benchmarking macros.
1218 - New! First try so that gras_stub_generator generate deployment and
1219 remote compilation helpers.
1221 - Bugfix: Initialization fix in msg_test.
1225 - Bugfix: applied patch to lexer so that it doesn't need a huge heap.
1227 - Bugfix: let dicts work with NULL content (_foreach didn't) and cleanups
1229 - API Change: gras_os_sleep to take the amount of seconds as a double.
1230 Accepting an int was error prone since it was the only location where
1231 seconds were coded as such. It leaded to damn rounding errors.
1232 - Bugfix: Hard to belive that timers ever worked before this.
1234 -- SimGrid team <simgrid2-users@listes.ens-lyon.fr> Wed, 23 Feb 2005 22:09:21 +0100
1236 SimGrid (2.91) unstable; urgency=low
1238 Alpha 2 on the path to SimGrid 3
1242 - Bug fix in the lmm_solver.
1244 - New! Interface to Paje (see http://www-id.imag.fr/Logiciels/paje/)
1245 through the function MSG_paje_output.
1246 - New! Introducing two new functions MSG_process_kill() and MSG_process_killall().
1247 - It is possible to bound the rate of a communication in MSG with
1248 MSG_task_put_bounded() (was already in the previous version but I had forgotten
1249 to write it in the changelog).
1250 - Bug fix to let GRAS run on top of MSG until we move it directly on top
1255 - Various cleanups to the autotools stuff
1256 - Begin to move Gras examples to examples/gras/
1257 - Let make distcheck work again (yeah!)
1259 - documentation overhauled using doxygen.
1260 gtk-doc-tools is dead in SimGrid now.
1261 - Automatically extract all existing logging categories, and add the list
1262 to the documentation (long standing one, to say the less)
1264 - Cleanup the known architecture table. Reorder the entries to group what
1265 should be, and use a more consistent naming scheme.
1266 (some of the test dataset are still to be regenerated)
1267 - New! Allow library to register globals on each process just as userdata
1269 This is implemented using a xbt_dict and not a xbt_set, so we loose the
1270 lookup time (for now).
1271 Use it in msg and trp.
1272 This cleans a lot the internals and helps enforcing privacy of the
1273 headers between the gras components.
1274 - New! Add a timer mechanism, not unlike cron(8) and at(1).
1275 - Bugfix: gras_os_time was delirious in RL.
1276 - Bugfix: gras_trp_select/RL don't run into the wall when asked to select
1278 - Reenable GRAS now that it works.
1280 -- Arnaud Legrand <Arnaud.Legrand@imag.fr> Mon, 14 Feb 2005 14:02:13 -0800
1282 SimGrid (2.90) unstable; urgency=low
1284 Alpha 1 on the path to SimGrid 3
1286 * It is a long time since the last release of SimGrid. I'm sorry about
1287 that but as I had told you, I was rewriting a lot of things. I apologize
1288 to those who had been reporting bugs to me and that I had not answered.
1289 If your bug is still in the new version, please tell me. Here is a
1290 summary of the main changes.
1292 * REVOLUTION 1: The SimGrid project has merged with the GRAS project
1293 lead by Martin Quinson. As a consequence SimGrid gains a lot in
1294 portability, speed, and a lot more but you'll figure it out later.
1295 SimGrid now comprises 3 different projects : MSG, GRAS and SMPI.
1296 I wanted to release the new MSG as soon as possible and I have
1297 broken GRAS, which is the reason why, for now, only MSG is fully
1298 functional. A laconic description of these projects is available
1299 in the documentation.
1301 * REVOLUTION 2: I have removed SG and I am now using a new simulation
1302 kernel optimized for our needs (called SURF but only the developers
1303 should use it). Hence, MSG is now roughly 30 times faster and I think
1304 that by rewriting a little bit MSG, I could event speed it up a little
1305 bit more. Beside the gain in speed, it is also much easier to encode a
1306 new platform model with SURF than it was with SG. More to come...
1308 * REVOLUTION 3: I have tried to change a little as possible the API of
1309 MSG but a few things really had to disappear. The main differences
1310 with the previous version are :
1311 1) no more m_links_t and the corresponding functions. Platforms are
1312 directly read from a XML description and cannot be hard-coded
1313 anymore. The same format is used for application deployment
1314 description. The new format is described in the documentation.
1315 Have a look in tools/platform_generation. There is a tiny script
1316 that converts from the old platform format to the new one. Concerning
1317 the application deployment format, parsing the old one is tricky.
1318 I think most of you should however be able to convert your files. If
1319 it is really an issue, I can write a C code that does the conversion.
1321 2) the toolbox tbx does not exist anymore. We now have a library
1322 with much more data-structures but without the hash-tables (we have
1323 dictionaries that are much faster).
1325 -- Arnaud Legrand <Arnaud.Legrand@imag.fr> Mon, 31 Jan 2005 10:45:53 -0800
1327 *****************************************************************************
1328 * Follows the old GRAS changelog. It does not follow the same syntax, but I *
1329 * don't feel like converting the oldies. (Mt) *
1330 *****************************************************************************
1333 Version 2.90: "the long awaited one"
1334 - Finished rewriting and debugging MSG. Rewrote the documentation.
1335 - disable GRAS for now since it needs to be ported to the newest SG
1338 - Finish the port to windows (using mingw32 for cross-compile)
1341 - Main loop and datastructures of SURF. A cpu resource object is
1342 functional. Surf can thus be used to create cpu's with variable
1343 performance on which you can execute some actions.
1345 2004-11-15 Martin Quinson
1346 - Port to ARM. Simply added the alignment and size descriptions. Should
1347 work, but the ARM machines are so slow that I didn't had the opportunity
1348 to 'make check' over there yet.
1350 2004-11-15 Arnaud Legrand
1351 - Trace manager now written. It uses a heap structure and is therefore
1352 expected to be efficient. It may however be speeded up (particularly
1353 when many events occur at the same date) by using red and black
1354 trees. One day maybe...
1355 - Max-min linear system solver written. It uses a sparse matrix
1356 structure taking advantage of its expected use. Most operations are
1357 O(1) and free/calloc are called as few as possible. The computation of
1358 the minimum could however be improved by using a red and black tree
1361 2004-11-03 Arnaud Legrand
1362 - Rename every gras_* function that was in xbt/ to its xbt_
1364 - Add a heap and a doubly-linked list to xbt
1365 - Added a dichotomy to the dictionaries. make check works as well before
1366 so I assume that the patch is correct. I do not know however if things
1367 run effectively faster than before now. :)
1369 Inclusion of the SimGrid tree in the GRAS one. The archive is renamed to
1370 SimGrid, and the version number is bumped to 2.x
1372 2004-10-29 Martin Quinson
1373 - Introduction of the remote errors.
1374 They are the result of a RMI/RPC on the remote machine.
1375 ErrCodes being scalar values, you can't get the host on which those
1376 errors did happen. Extending the error mechanism as in Gnome is possible.
1377 No idea yet whether it is a good idea.
1379 2004-10-28 Martin Quinson
1380 - Interface revolution: the Starred Structure Eradication.
1381 I used to do typedef struct {} toto_t; and then handle *toto_t.
1382 Arnaud (and Oli) didn't like it, and I surrendered. Now, you have:
1383 - ???_t is a valid type (builded with typedef)
1384 - s_toto_t is a structure (access to fields with .)
1385 - s_toto is a structure needing 'struct' keyword to be used
1386 - e_toto_t is an enum
1387 - toto_t is an 'object' (struct*)
1389 typedef struct s_toto {} s_toto_t, *toto_t;
1390 typedef enum {} e_toto_t;
1391 Moreover, only toto_t (and e_toto_t) are public. The rest (mainly
1392 s_toto_t) is private.
1394 - While I was at it, all gras_<obj>_free() functions want a gras_<obj>_t*
1395 so that it can set the variable to NULL. It was so for dicts and sets,
1396 it changed for dynars.
1398 - Fix a bunch of memleaks in dict_remove
1399 - Fix a bug in sg/server_socket opening: it failed all the time.
1401 2004-10-07 Martin Quinson
1402 - Speed up dynar lookup operation a bit.
1404 gras_dynar_get is dead.
1406 Now, you can choose between gras_dynar_get_cpy (the old gras_dynar_get
1407 but should be avoided for efficiency reasons) and gras_dynar_get_ptr
1408 (which gives you the address of the stored data).
1410 gras_dynar_get_as is an helpful macro which allows you to retrieve a
1411 copy of the data using an affectation to do the job and not a memcpy.
1413 int toto = gras_dynar_get_as(dyn,0,int); rewrites itself to
1414 int toto = *(int*)gras_dynar_get_ptr(dyn,0);
1416 It does not really speedup the dynar test because they are
1417 setting elements all the time (and look them seldom). But the dict does
1418 far more lookup than setting.
1420 So, this brings the dict_crash test from ~33s to ~25s (200000 elms).
1422 2004-10-05 Martin Quinson
1423 - Allow to (en/dis)able the cycle detection at run time.
1425 Whether we should check for cycle or not is now a property of each
1426 datatype. When you think there may be some cycle, use datadesc_cycle_set.
1427 datadesc_cycle_unset allow to remove this property when previously set.
1429 Note that the cycle detection is off by default since it impacts the
1430 performance. Watch the data you feed GRAS with ;)
1432 This property is hereditary. Any element embedded in a structure having it
1433 set have it set for the time of this data exchange.
1435 You should set it both on sender and receiver side. If you don't set it on
1436 sender side, it will enter an endless loop. If you forget on receiver
1437 side, the cycles won't be recreated after communication.
1439 - Header reorganization.
1440 Kill gras_private.h, each submodule must load the headers it needs.
1442 2004-10-04 Martin Quinson
1443 - Interface revolution: do not try to survive to malloc failure.
1445 Now, gras_malloc and friends call gras_abort() on failure.
1446 As a conclusion, malloc_error is not a valid error anymore, and all
1447 functions for which it was the only gras_error_t return value are
1448 changed. They now return void, or there result directly.
1449 This simplify the API a lot.
1451 2004-09-29 Martin Quinson
1452 - Re-enable raw sockets.
1453 Created by gras_socket_{client,server}_ext;
1454 Used with gras_raw_{send,recv}
1457 It should allow to kill the last bits of gras first version soon.
1459 This is not completely satisfactory yet (duplicate code with
1460 chunk_{send,recv}; a bit out of the plugin mechanism), but it should
1463 - Simplify transport plugin (internal) interface by not passing any
1464 argument to _server and _client, but embedding them in the socket
1467 2004-09-28 Martin Quinson
1468 - Finish the port to AIX.
1469 autoconf was my problem (segfault within the malloc replacement
1470 function. No idea why)
1472 2004-09-16 Martin Quinson
1473 - Fix some size_t madness on 64bit architectures.
1475 2004-09-08 Martin Quinson
1476 - Reduce the number of system headers loaded, overload some more system
1477 calls (such as malloc to cast the result of the system one, and work
1479 - Fix and reintroduce the config support
1481 2004-09-07 Martin Quinson
1482 - Source code reorganization to allow Arnaud to surf all over there.
1483 - Allow to document the logging categories.
1484 - Remove all uppercase from logging categories and useless cleanup in names.
1486 2004-08-18 Martin Quinson
1487 Version 0.6.2 (protocol not changed; API changed)
1488 - Interface cleanup: gras_msgtype_by_name returns the type (instead of a
1489 gras_error_t), and NULL when not found. Functions expecting a msgtype
1490 as argument (msg_wait; msg_send) deal with NULL argument by providing a
1491 hopefully usefull message.
1492 - Portability to prehistoric sparcs again
1494 2004-08-17 Martin Quinson
1495 Version 0.6.1 (protocol not changed; ABI not changed)
1496 - prealloc some buffers to speed things up
1498 2004-08-11 Martin Quinson
1499 Version 0.6 (protocol not changed; ABI expended)
1500 - The parsing macro can deal with the references, provided that you add
1501 the relevant annotations (using GRAS_ANNOTE(size,field_name))
1503 2004-08-09 Martin Quinson
1504 Version 0.5 (protocol not changed; ABI changed)
1505 - Allow to off turn the cycle detection code in data exchange at
1506 compilation time. It should be at run time, but I'm short of time (and
1507 the config stuff is still broken). That way, we keep dict out of the
1508 critical path, which is good because the performance is poor:
1509 - search not dichotomial yet
1510 - dynar give no way to access their content and memcpy everytime
1511 - In composed data description (struct, ref and so on), stop foolness of
1512 keeping the subtype's ID, but store the type itself. This keeps sets out
1513 of the critical path, which is good since they rely on dynar and
1514 dictionnaries. The only loose of that is that we cannot detect the
1515 redeclaration of a structure/union with another content (but I'm not sure
1516 the code detected well this error before anyway). We still can detect
1517 the redefinition discrepancy for the other types.
1518 - Use a whole bunch of optimisation flags (plus -fno-strict-aliasing since
1519 it breaks the code because of type-punning used all over the place).
1520 This breaks on all non-gcc architectures (for now).
1522 All those changes (plus the buffer of last time) allow me to gain 2 order
1523 of magnitude on cruel tests consisting of 800000 array of integers on two
1524 level of a hierarchical structure (200 secondes -> 4 secondes)
1527 - the selector of reference must now return the type it points to, not
1528 the ID of this type.
1530 2004-08-06 Martin Quinson
1531 Version 0.4 (protocol changed; ABI not changed)
1532 - Allow to pass --gras-log argument to processes in simulation mode. Really.
1533 - New debugging level: trace (under debug) to see effect of GRAS_IN/OUT
1534 - Implement a buffer transport, and use it by default (it relies on tcp in
1535 real life and on sg in simulation).
1536 That's a bit hackish since I had a new field to the structure to store
1537 its data without interfering with the subtype ones. Inheritance
1538 is tricky in C. And that's a kind of reverse inheritance with one class
1539 derivating two classes. Or maybe a game with java interfaces. Anyway,
1540 that's damn hard in C (at least).
1541 Moreover, I got tired while trying to ensure plugin separation and
1542 genericity in SG mode. MSG wants me to do weird things, so let's go for
1543 cruel hacks (temporarily of course ;).
1544 See comment in transport_private.h:71
1545 - do not include all the _interface headers in private but in the files
1546 which really need them (to cut the compilation time when they are
1549 2004-07-26 Martin Quinson
1550 Version 0.3 (protocol not changed; ABI changed)
1551 - Major overhault of the datadesc interface to simplify it:
1552 - shorted the function names:
1553 s/gras_datadesc_declare_struct/gras_datadesc_struct/ and so on
1554 - add a trivial way to push/pop integers into the cbps without malloc.
1555 This allows to make really generic sub_type description, which simply
1556 pop their size of the stack.
1557 - add a function gras_datadesc_ref_pop_arr() which does what users want
1558 most of the time: Declare a dynamic array (which pops its size of the
1559 stack) and declare a reference to it. Poor name, but anyway.
1560 - kill the post-send callback, add a post-receive one
1562 2004-07-23 Martin Quinson
1563 Version 0.2 (protocol changed; ABI changed)
1564 - add some testing for cpbs in the test cases, and fix some more bugs.
1565 This invalidate again the little64 data file, since I cannot regenerate
1567 - remove an awfull optimization in the logging stuff, allowing me to:
1568 - understand it again
1569 - learn gcc how to check that the argument match the provided format
1570 - fix all errors revealed by gcc after that
1571 - internal keys of dict are not \0 terminated. Deal with it properly in
1572 loggings instead of segfaulting when the user want to see the logs :-/
1574 2004-07-22 Martin Quinson
1575 - Fix some stupid bug preventing cbps (callback postit) from working
1577 2004-07-21 Martin Quinson
1578 - Some documentation cleanups
1579 - remove the useless last argument of msgtype_declare
1580 - rename the Virtu functions to fit into the 'os' namespace
1581 - move headers src/include -> src/include/gras/ and stop fooling with
1582 gras -> . symbolic link
1583 - make distcheck is now successful
1585 2004-07-19 Martin Quinson
1587 - Build shared library also
1588 - Install html doc to the right location
1589 - stop removing maintainer files in make clean
1590 - build tests only on make check
1592 2004-07-13 Martin Quinson
1594 - No major issue in previous version => change versionning schema
1595 - Re-enable little64 convertion test now that Abdou kindly regenerated the
1596 corresponding dataset.
1598 2004-07-11 Martin Quinson
1600 - Get it working with any kind of structure (we can compute the padding
1601 bytes remotely for all the architectures I have access to)
1602 - Implement the structure parsing macro (still not quite robust/complete)
1603 - Improvement to the remote testing toysuite
1605 2004-07-10 Martin Quinson
1606 [autoconf mechanism]
1607 - get ride of a bunch of deprecated macros
1608 - actually run the test for two-compliment, not only compile it :-/
1609 - test whether the structures get packed (and bail out if yes. Damn.
1610 Alignment is a serious matter)
1611 - test whether the structures get compacted (but respecting the alignment
1612 constraints of each types)
1613 - test whether the array fields of structures can straddle alignment boundaries
1615 - Damnit, double are bigger than float (typo in creation of 'double' datadesc)
1616 (took me 2 hours to find that bug, looking at the wrong place)
1617 - Add gras_datadesc_declare_{union,struct}_close(). They must be used
1618 before sending/receiving and are used to compute the offsets of fields
1619 - Given that padding size depend even on compiler options, keep track of
1620 alignment and aligned_size only for the current architecture. Not a big
1621 deal since we send structure fields one after the other (seems
1623 - Add the datastructure used for IEEE paper by the PBIO guys to the test
1624 program, let it work on linux/gcc/little32. portability todo.
1626 2004-07-08 Martin Quinson
1627 - import and improve remote compilation support from FAST
1628 - make sure make check works on half a dozen of machines out there
1630 2004-07-07 Martin Quinson
1631 Let's say it's version 0.0.3 ;)
1632 - Implement conversions (yuhu!)
1633 - Let it work on solaris (beside conversion, of course)
1634 - Stupid me, using rand() to generate the conversion datatests in not wise.
1636 2004-07-06 Martin Quinson
1637 - Let make dist work, since I'm gonna need it to compile on remote hosts
1638 - Let Tests/datadesc_usage write the architecture on which the file was
1639 generated as first byte.
1640 - Add PowerPC (being also IRIX64), SPARC (also power4) and ALPHA
1641 architecture descriptions.
1642 - Add datadesc_usage.{i386,ppc,sparc} files being the result of execution
1643 on those architectures.
1644 - Optimization: send/recv array of scalar in one shoot
1646 2004-07-05 Martin Quinson
1647 - YEAH! GRAS/SG and GRAS/RL are both able to run the ping example !
1649 - Plug a whole bunch of memleaks
1650 - each process now have to call gras_{init,exit}. One day, their log
1651 settings will be separated
1652 - Continue the code factorisation between SG, RL and common in Transport.
1654 2004-07-04 Martin Quinson
1656 - Redistribution between SG and RL.
1657 We wanna have to accept in SG, so move accepted related parts of RL in
1658 the common part. (more precisely, the dynar of all known sockets is no
1659 more a static in transport.c, but part of the process_data)
1661 [gras_stub_generator]
1662 - Bug fix: Do call gras_process_init from gras_init (wasnt called in RL).
1664 2004-07-03 Martin Quinson
1665 - Create a new log channel tbx containing dict, set, log, dynar (to shut
1666 them all up in one shot)
1668 - Fix the ugly case of reference to dynamic array.
1669 - New (semi-public) function gras_datadesc_size to allow the messaging
1670 layer to malloc the needed space for the buffer.
1672 - gras_socket_close now expect the socket to close (and not its address to
1673 put NULL in it after it). This is because the socket passed to handlers
1674 is one of their argument (=> not writable).
1676 - propagate the interface cleanup from last week in datadesc, ie remove a
1677 superfluous level of indirection. User pass adress of variable
1678 containing data (both when sending and receiving), and not of a variable
1679 being a pointer to the data. Let's say that I like it better ;)
1680 The price for that is constructs like "int msg=*(int*)payload" in
1681 handlers, but it's a fine price, IMHO.
1683 - Let it work in RL (yuhu)
1685 2004-06-21 Martin Quinson
1687 - porting SG plugin and SG select to new standards (works almost).
1688 - plug memleaks and fix bugs around.
1691 - cleanup the prototype of data recv and force users to specify when they
1692 want to handle references to objects. Test case working even for cycles.
1693 - plug memleaks. Valgrind is perfectly ok with this.
1695 2004-06-12 Martin Quinson
1697 - cleanup the separation between plugin and main code in plugin creation
1699 2004-06-11 Martin Quinson
1701 - Reput hook for raw sockets, needed for BW experiments
1702 - kill a few lines of dead code
1703 [Data description] Interface cleanup
1704 - gras_datadesc_by_name returns the searched type or NULL.
1705 That way, no variable is needed to use a type desc once, which makes
1707 - gras_datadesc_declare_[struct|union]_append_name is removed. The last
1708 two parameters were strings (field name, type name), leading to
1710 [Dicos] Interface cleanup
1711 - gras_dico_retrieve -> gras_dico_get ; gras_dico_insert -> gras_dico_set
1712 This is consistant with the dynar API.
1714 2004-04-21 Martin Quinson
1716 - Porting to new standards.
1718 - interface cleanup.
1719 There is no bag anymore, no need to take extra provision to mask the
1720 pointers behind "ID".
1721 Better splitup of functions between files create/exchange/convert.
1722 This is still a bit artificial since convert and receive are so
1723 interleaved, but anyway.
1725 - add a queued message list to procdata (the ones not matching criteria
1727 - factorize some more code between SG and RL wrt procdata
1729 - use gras_exit in example to track memleaks
1730 - get rid of gs_example now that GS is properly integrated into gras
1731 - update run_test to integrate the lastest tests (datadesc)
1733 - rename WARNINGn macros to WARNn since it prooved error-prone
1735 2004-04-19 Martin Quinson
1737 - register init/exit functions within gras module mechanism
1738 - send/receive function.
1739 Convertion is not implemented, but short-cutted if not needed.
1740 struct/array elements are sent one by one (instead of block-wise), but
1741 nobody really cares (yet). Get a prototype before optimizing.
1742 - tests (using a file socket) for DD send/receive on:
1743 - base types: int, float
1744 - array: fixed size, string (ie ref to dynamic string)
1745 - structure: homogeneous, heterogeneous
1746 - chained list, graph with cycle
1747 Believe it or not, valgrind is not too unhappy with the results. The
1748 cycle happily segfaults, but the others are ok. And I'm sick of pointers
1752 - Bugfix when using a filename explicitely (instead of '-')
1754 2004-04-09 Martin Quinson
1756 - factorize more code between RL and SG in socket creation
1757 - Complete the implementation and tests of:
1759 o file (only in RL, and mainly for debugging)
1761 I lost 3 days to design a portable address resolver, and then decided
1762 that the prototype mainly have to run on my box.
1763 Addressing portability too early may be like optimizing too early :-/
1765 - use gras_init in the Tests instead of the crappy parse_log_opt
1766 (the latter function is removed)
1767 [Conditional execution]
1768 - New functions: gras_if_RL/gras_if_SG (basic support for this)
1769 [Code reorganisation]
1770 - Get rid of libgrasutils.a since it makes more trouble than it solves.
1771 Build examples against the RL library, since there is no way to disable
1772 its creation for now.
1774 For information, the beginning of coding on GRAS was back in june
1775 2003. I guess that every line has been rewritten at least twice since