+SimGrid (3.27.1) NOT RELEASED YET (v3.28 expected June 21. 2021, 03:32 UTC)
+
+S4U:
+ - Fixed a bug where Activity::wait_for() killed the activity on timeout.
+ Explicitly cancel the activity to get back to previous behavior.
+
+SMPI:
+ - The default SMPI compiler flags are no more taken from the environment.
+ They can be explicitly set through cmake parameters SMPI_C_FLAGS,
+ SMPI_CXX_FLAGS, or SMPI_Fortran_FLAGS.
+
+LUA:
+ - Lua platform files are deprecated. Their support will be dropped after v3.31.
+
+XBT:
+ - xbt_assert is not disabled anymore, even when built with enable_debug=off.
+
+Documentation:
+ - New tutorial: Model-checking and formal assessment
+
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
+ - FG#47: Complete and fix tests from teshuite/s4u/activity-lifecycle
+ - FG#64: Configuring smpi/IB-penalty-factors
+ - FG#67: Running computation concurrently with MPI_Iallreduce
+ - GH#322: Issue when an actor kills his host vm
+
+----------------------------------------------------------------------------
+
+SimGrid (3.27) March 29. 2021
+
+The Ragnar Release (anniversary of the siege of Paris by Vikings in 845)
+
+Main user-visible changes:
+ - All functions marked as deprecated for one year were removed.
+ - Removed all that was related to the "Storage" type in all APIs and bindings.
+ "Disks" have been introduced more than a year ago to replace them for the better.
+ It's time to finish this replacement.
+ - SMPI ABI breaks from previous version: MPI global handles (predefined datatypes,
+ ops, COMM_WORLD) are now defined differently, and can be used in initializers,
+ avoiding "initializer element is not constant" errors with some codes. Please be
+ careful to recompile your MPI codes if switching to this new SimGrid version.
+ - Network model ns-3 now requires version ns-3.28 or higher.
+ - Removed some option aliases that were deprecated since v3.23 (June 2019)
+ - 'verbose-exit' is now 'debug/verbose-exit'
+ - 'simix/breakpoint' is now 'debug/breakpoint'
+ - 'clean-atexit' is now 'debug/clean-atexit'
+
+S4U:
+ - New functions: Comm::sendto_{init,async} to initiate a communication
+ on between two (possibly remote) hosts.
+ - Define new template functions Mailbox::get_unique(), returning a std::unique_ptr.
+ - Functions Mailbox::get() and Mailbox::get_async() are now templated with the
+ type of the pointee. Untyped functions are deprecated. Use Mailbox::get<void>()
+ or Mailbox::get_async<void>() if you really want to play with void*.
+ - Unify the interface of Activity::on_{start/activity}
+ - New function: Comm::get_dst_data()
+ - New function: Comm::set_payload_size() to set the amount of bytes to simulate.
+
+Models:
+ - ptask should now work better with multicore hosts (FG#37).
+ - Internal cleanups and refactoring around activities, to prepare for SimDAG++.
+ - Internal cleanups and refactoring around models, to prepare for programmatic
+ platform creation.
+ - Modernize our tests of the performance models
+
+Documentation:
+ - User manual:
+ - New section: Configuring the logs from the command line.
+ - New section: Programming API of logs.
+ - New section: Getting realistic results
+ - New section: Examples of SMPI Usage
+ - New part: SimGrid's Internals, with a section on Design goals
+ - Move back to the classical Breathe tool chain, and fix many small glitches.
+
+SMPI:
+ - Handle leak checking: SMPI will now display a message if MPI handles are still
+ present at the end of a simulation. Option smpi/list-leaks:n will display the n
+ first leaked pointers and their types.
+ - smpi/display-allocs option : Display Memory allocations analysis, with hints
+ about the largest allocations. This only works for allocations with malloc/calloc
+ and not compiled with SMPI_NO_OVERRIDE_MALLOC
+ - "-analyze" option in smpirun will activate smpi/display-allocs and smpi/display-timing
+ - New implemented MPI calls: MPI_File_set_size, MPI_Aint_add, MPI_Aint_diff,
+ MPI_Type_get_extent_x, MPI_Type_get_true_extent_x, MPI_Status_set_elements_x
+ - Support for MPI C++ datatypes (MPI_CXX_BOOL, MPI_CXX_FLOAT_COMPLEX,
+ MPI_CXX_DOUBLE_COMPLEX, MPI_CXX_LONG_DOUBLE_COMPLEX)
+ - Replay now opens and parses the trace file only once for all ranks when possible.
+ - Misc fixes:
+ - better handling of MPI_PROC_NULL
+ - MPI_Group_incl was broken in some cases
+ - PAPI tracing now fixed
+ - MPI_Errhandlers are properly handled for MPI_COMM_WORLD
+ - SMPI will now fail properly when receive size < sent size, instead of
+ just setting MPI_ERR_TRUNCATE and keep going.
+ - Proxy Apps ( https://framagit.org/simgrid/SMPI-proxy-apps ):
+ - Remove useless build patches and split build/run patches on the page
+ - Build in parallel when possible
+ - Test on yum-based systems
+ - New nightly tested Proxy-apps:
+ - OpenMPI mpi-test-suite
+ - Coral MCB, LSMS, Qbox, CLOMP
+ - ECP/Mantevo Cloverleaf3D, Ember
+ - Codevault bhtree_mpi
+
+Model checker:
+ - Only initialize the Dwarf parser when needed, saving 10 seconds in most cases.
+ - Start to overhaul the implementation to modernize it (still ongoing).
+
+XBT:
+ - Drop simgrid::xbt::demangle(). Please use boost::core::demangle() instead.
+ - Drop xbt_dynar_cursor_rm(), xbt_dynar_search_or_negative(),
+ xbt_str_split_quoted(), xbt_str_split_quoted_in_place().
+ - Deprecate xbt_dynar_to_array().
+ - When an exception occurs in kernel mode, display both the actor and kernel stacks.
+
+C binding and interface:
+ - Rename (lowercase) functions sg_actor_get_PID, sg_actor_get_PPID, sg_actor_by_PID.
+ - Constness requirement has been lowered for parameter argv of sg_actor_start()
+ and sg_actor_create() It's now (char* const*). The previous version is still
+ available as sg_actor_start_() and sg_actor_create_().
+
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
+ - FG#37: Parallel tasks are limited to 1 core per host
+ - FG#62: Running "smpirun -replay" on large networks
+ - FG!46: Fix a few potential memory leaks in SMPI colls
+ - GH#343: Wrong consumed energy when an exec timeouts
+
+----------------------------------------------------------------------------
+
+SimGrid (3.26) December 15. 2020
+
+The Release release (the French lockdown was eased today).
+
+Important user-visible changes:
+ - SimGrid now requires a compiler with C++14 support.
+ Sibling projects should upgrade their FindSimgrid.cmake
+ - Surf precision default value is now 1e-9, instead of 1e-5. This was changed as
+ several users had difficulties to understand issues when using high bandwidth or
+ small latency events. The new value was already the default for SMPI and
+ should not cause too much performance hit. It can change some simulation
+ timings if simulation was skipping a lot of small events (which was actually
+ an issue per see). The old value can be restored with --cfg=surf/precision:1e-5.
+ - On some network models (L07, CM02, LV08), an implicit loopback link is created
+ for local communication. Default bandwidth was 500MBps and latency was 15µs,
+ which was rather bad. Default values have been changed to 10GBps and 0 latency.
+ Options network/loopback-lat and network/loopback-bw have been added to adapt
+ these values if needed. Network and routing models already providing separate
+ loopbacks (clusters and such) are not impacted by this change.
+ - SMPI now adds 16 bytes of header to each message sent, in order to simulate
+ metadata that are added to each MPI message by MPI libraries (tag,
+ src/dest, and communicator information). This may change simulation times
+ for very small message sizes, but should be more realistic.
+
+New features:
+ - New routing 'WiFi' that makes it easier to specify a wifi network zone.
+ - New plugins: wifi_energy and link_load. See the associated examples.
+ - New examples: wifi networks, and communication suspend.
+
+General:
+ - LTO is now enabled for Intel/clang compilers.
+ - LTO behavior on GCC can be parameterized using LTO_EXTRA_FLAG in cmake.
+ Setting it to "auto" will use all available cores, while setting it to n will
+ use n cores to speedup link step (usage: cmake -DLTO_EXTRA_FLAG=4).
+ - Remove obsolete runtime option 'contexts/parallel-threshold'.
+ - Runtime option 'tracing/msg/process' renamed to 'tracing/actor'. The old name
+ has been kept for compatibility.
+ - Finally remove obsolete snake_case() aliases for runtime options.
+ - Further improve the documentation.
+
+S4U:
+ - the on_exit() of each actor is also executed when the simulation deadlocks.
+ - New functions: s4u::Activity:: suspend(), resume() and is_suspended()
+ An example is provided for s4u::Comm but it should work with Exec and Io.
+
+SMPI:
+ - Update proxy apps coverage of new ECP apps: 60+ apps now tested nightly on
+ https://framagit.org/simgrid/SMPI-proxy-apps
+ - MPI/IO: supports names starting with "./"
+ - Fortran: many MPI/IO bindings, support for MPI_UB/LB, C MPI_INT/FLOAT/DOUBLE
+ datatypes.
+ - smpicc/cxx/ff/f90 now will actually perform definition checks at link time. When
+ building shared libraries, this may cause issues, so environment variable
+ SMPI_NO_UNDEFINED_CHECK can be added to disable this.
+ - most temporary files should now be created in /tmp dir (or equivalent).
+ If this one does not allow execution of code (noexec flag), this may cause issues.
+ Please use another tmp directory (using TMPDIR or equivalent system variable)
+ in this case.
+
+Model-Checker:
+ - A large refactoring is ongoing, but this should be transparent for users so far.
+
+XBT:
+ - Drop xbt_str_split().
+
+C binding and interface:
+ - The return type of the sg_actor_on_exit() callbacks is now 'void'
+ (int value was previously ignored)
+ - Many C functions were renamed to follow a common naming style
+ (sg_object_get_something and sg_object_set_something). As usual, the deprecated
+ names are kept until version 3.30.
+ - Many MSG tests were converted to the new S4U's interface in C, that
+ was extended for that.
+
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
+ - FG#41: Add sg_actor_create C interface
+ - FG#43: xbt::random needs some care
+ - FG#48: The Impossible Did Happen (yet again)
+ - FG#50: Suspending an actor executed at the current timestamp fails
+ - FG#52: Zero-seconds timeout : "That's in the past already"
+ - FG#53: Crash while using ns-3 network model
+ - FG#54: How to suspend a comm?
+ - FG!22: Stochastic Profiles
+ - FG!24: Documentation and fix for xbt/random
+ - FG!35: Add a modeling hint for parallel links in doc
+ - FG!36: [xbt/random] Read/Write the state of the RNG
+ - FG!42: Link cumulated load plugin
+ - FG!44: Test condition variable wait_until+notify_all
+ - GF#18137: Allow different stack sizes?
+ - GH#128: Parallelization of simulation with --cfg=contexts/nthreads
+ - GH#139: Allow pthread creation in SMPI
+ - GH#336: Packet-level simulation using SMPI?
+ - GH#345: Error in the LMM while migrating a VM
+ - GH#346: [SMPI] error while loading shared libraries: libsimgrid.so
+ - GH#352: pip install / python setup.py install fail to find pybind11
+ - GH!337: Fix link_energy plugin for wifi platforms
+ - GH!339: Add Mailbox set_receiver method to python binding
+ - GH!344: Cast hugepages macros parameters to int64
+
+----------------------------------------------------------------------------
+
+SimGrid (3.25) February 2. 2020 (aka 02 02 2020)
+
+The Palindrom Day Release.
+
+Important user-visible changes:
+ - Improve the Python usability (stability and documentation).
+ - A nasty synchronization bug was ironed out, see also below.
+ - Python's doc was organized as a separate tree, now integrated with C++.
+ - C bindings of S4U were not part of the doc.
+ - The C++ doc was also improved as methods are now split by theme.
+ - Further deprecate MSG: you now have to pass -Denable_msg=ON to cmake.
+ - This is mandatory to use the Java bindings.
+ - OFF by default; The plan is to completely remove MSG by 2020Q4 or 2021Q1.
+ - SimDAG++: Automatic dependencies on S4U activities (experimental)
+ - Some features are already implemented but not all of them
+ - Cannot block an activity until it's scheduled on a resource
+ - No heterogeneous wait_any() that would mix Exec/Comm/Io activities.
+ - See examples/s4u/{io,exec,comm}-dependent for what's already there.
+
+General:
+ - Upgrade documented Java dependency to Java 8 (earlier versions don't work).
+ - Drop support for Viva/Triva (old visualization tools), hence removed
+ TRACE_get_node_types() and TRACE_get_edge_types() functions.
+
+Python:
+ - Require pybind11 version 2.4.
+ - Greatly improve locking during context switches with Python.
+ - Declaring Python callbacks to this_actor::on_exit is now working.
+ - No more tests are failing currently, even on win32.
+
+S4U:
+ - Actor: Merge signals on_migration_start/end into on_host_change
+ - Actor: Rename migrate() into set_host()
+ - Disk: Allow users to get the read and write nominal bandwidth values
+ - Exec: Implement wait_for(timeout)
+ - Io: Implement wait_for(timeout)
+
+XML:
+ - Parse errors now raise a simgrid::ParseError that you may want to catch.
+
+Kernel:
+ - In simgrid::kernel::resource::Model, the methods next_occuring_event*() have
+ been renamed to fix a spelling error. As usual, the previous definitions are
+ kept with a deprecation warning. However, to avoid runtime errors, it is now
+ forbidden to override these deprecated methods in a derived class. Please use
+ the new names immediately if you need to override them.
+
+XBT:
+ - Remove unused parameter 'free_ctn' for xbt_dict_set() and xbt_dict_set_ext().
+ - Drop unused functions for dicts and dynars: xbt_dict_cursor_get_elm,
+ xbt_dict_get, xbt_dict_get_elm, xbt_dict_get_ext, xbt_dict_get_key,
+ xbt_dict_remove, xbt_dict_reset, xbt_dynar_compare, xbt_dynar_dump,
+ xbt_dynar_foreach_ptr, xbt_dynar_free_data, xbt_dynar_free_voidp,
+ xbt_dynar_init, xbt_dynar_insert_at_as, xbt_dynar_merge,
+ xbt_dynar_remove_n_at, xbt_dynar_replace, xbt_dynar_search, xbt_dynar_set.
+ - New module: random, providing classical random numbers generators.
+
+SMPI:
+ - New option : "smpi/auto-shared-malloc-thresh" which sets a value for
+ allocations' size above which they are considered "shared" by default (as if
+ they were performed through SMPI_SHARED_MALLOC macros).
+ Default = 0 = disabled feature.
+ Note : malloc, calloc and free are now overridden by smpicc/cxx by default.
+ This can cause some troubles if codes are already overriding these. If this
+ is the case, defining SMPI_NO_OVERRIDE_MALLOC in the compilation flags can
+ help, but will make this feature unusable.
+ - Input check is now performed much more consistently and outputs precise
+ warnings for each error found
+ - New supported calls : MPI_File_set_view, MPI_File_get_view
+ - MPI I/O now only supports disks, as storage is discontinued.
+ - MPI I/O allows opening files without specifying absolute path
+ - Note : SMPI configuration options are now initialized by smpi_init_options()
+ call, which should be called if SMPI is not being used through smpirun.
+
+Fixed bugs (FG#.. -> framagit bugs; FG!.. -> framagit merge requests):
+ - FG#9: Python bindings crashing
+ - FG#39: Missing s4u::Comm::wait_any_for example
+ - FG#42: Add support for ThreadSanitizer (TSan)
+ - FG!19: Removing RngStream
+ - FG!20: A module for RNG calls
+ - FG!21: Choice between ad-hoc and standard distributions implementations
+ - FG!23: Master
+ - FG!25: Fix link in Mutex doc
+ - FG!26: Fix links in SMPI interface doc
+ - GH#31: [MC] please provide an option to make MPI_Send asynchronous
+ - GH#305: Unscheduled tasks are still excuted
+ - GH#313: smpirun: manual outdated w.r.t. --help
+ - GH#321: [S4U] Get task remaining work ratio
+ - GH#323: Crash when an actor turn off his physical host
+ - GH#335: Missing links on dragonfly example svg
+ - https://lists.gforge.inria.fr/pipermail/simgrid-user/2019-November/004653.html:
+ MPI_Cart_sub was not working properly. Kudos to Jonathan Borne for the report.
+
+----------------------------------------------------------------------------