1 /* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "simgrid/s4u/Engine.hpp"
8 #include "smpi_coll.hpp"
9 #include "smpi_f2c.hpp"
10 #include "smpi_host.hpp"
11 #include "src/kernel/activity/CommImpl.hpp"
12 #include "src/simix/smx_private.hpp"
13 #include "src/smpi/include/smpi_actor.hpp"
14 #include "xbt/config.hpp"
16 #include <cfloat> /* DBL_MAX */
21 #if not defined(__APPLE__)
25 #if defined(__APPLE__)
26 # include <AvailabilityMacros.h>
27 # ifndef MAC_OS_X_VERSION_10_12
28 # define MAC_OS_X_VERSION_10_12 101200
30 # define HAVE_WORKING_MMAP (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12)
31 #elif defined(__FreeBSD__)
32 # define HAVE_WORKING_MMAP 0
34 # define HAVE_WORKING_MMAP 1
38 #include <sys/sendfile.h>
41 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
42 #include <boost/tokenizer.hpp>
43 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
45 #if defined(__INTEL_COMPILER) || defined(__ICC)
46 extern "C" void for_rtl_init_ (int *, char **);
47 #elif defined(__GNUC__)
48 extern "C" void _gfortran_set_args(int, char **);
49 #elif defined(__FLANG)
50 extern "C" void __io_set_argc(int);
51 extern "C" void __io_set_argv(char **);
55 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
56 * See https://www.akkadia.org/drepper/dsohowto.pdf
57 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
59 #define RTLD_DEEPBIND 0
64 std::string papi_default_config_name = "default";
65 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
68 using simgrid::s4u::Actor;
69 using simgrid::s4u::ActorPtr;
70 std::unordered_map<std::string, double> location2speedup;
72 static std::map</*process_id*/ ActorPtr, simgrid::smpi::ActorExt*> process_data;
73 int process_count = 0;
74 static int smpi_exit_status = 0;
75 int smpi_universe_size = 0;
76 extern double smpi_total_benched_time;
77 xbt_os_timer_t global_timer;
78 static std::vector<std::string> privatize_libs_paths;
80 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
81 * is important because the implementation of MPI_Comm checks
82 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
84 * This is basically how we only have one global variable but all processes have
85 * different communicators (the one their SMPI instance uses).
87 * See smpi_comm.cpp and the functions therein for details.
89 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
90 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
91 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
92 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
93 // No instance gets manually created; check also the smpirun.in script as
94 // this default name is used there as well (when the <actor> tag is generated).
95 static const std::string smpi_default_instance_name("smpirun");
96 static simgrid::config::Flag<double> smpi_wtime_sleep(
97 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
98 static simgrid::config::Flag<double> smpi_init_sleep(
99 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
101 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
103 int smpi_process_count()
105 return process_count;
108 simgrid::smpi::ActorExt* smpi_process()
110 ActorPtr me = Actor::self();
112 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
115 return process_data.at(me);
118 simgrid::smpi::ActorExt* smpi_process_remote(ActorPtr actor)
120 return process_data.at(actor);
123 MPI_Comm smpi_process_comm_self(){
124 return smpi_process()->comm_self();
127 void smpi_process_init(int *argc, char ***argv){
128 simgrid::smpi::ActorExt::init(argc, argv);
131 int smpi_process_index(){
132 return simgrid::s4u::this_actor::get_pid();
135 void * smpi_process_get_user_data(){
136 return Actor::self()->get_impl()->get_user_data();
139 void smpi_process_set_user_data(void *data){
140 Actor::self()->get_impl()->set_user_data(data);
144 int smpi_global_size()
146 char *value = getenv("SMPI_GLOBAL_SIZE");
147 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
149 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
152 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
154 smpi_comm_copy_data_callback = callback;
157 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
159 for (auto const& block : private_blocks)
160 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
163 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
164 for (auto const& block : private_blocks)
165 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
168 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
170 simgrid::kernel::activity::CommImplPtr comm =
171 boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(synchro);
174 size_t src_offset = 0;
175 size_t dst_offset = 0;
176 std::vector<std::pair<size_t, size_t>> src_private_blocks;
177 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
178 XBT_DEBUG("Copy the data over");
179 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
180 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
181 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
184 src_private_blocks.clear();
185 src_private_blocks.push_back(std::make_pair(0, buff_size));
187 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
188 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
189 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
192 dst_private_blocks.clear();
193 dst_private_blocks.push_back(std::make_pair(0, buff_size));
195 check_blocks(src_private_blocks, buff_size);
196 check_blocks(dst_private_blocks, buff_size);
197 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
198 check_blocks(private_blocks, buff_size);
200 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
201 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
202 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
203 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
204 smpi_switch_data_segment(comm->src_proc->iface());
205 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
206 memcpy_private(tmpbuff, buff, private_blocks);
209 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) && ((char*)comm->dst_buff >= smpi_data_exe_start) &&
210 ((char*)comm->dst_buff < smpi_data_exe_start + smpi_data_exe_size)) {
211 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
212 smpi_switch_data_segment(comm->dst_proc->iface());
214 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
215 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
217 if (comm->detached) {
218 // if this is a detached send, the source buffer was duplicated by SMPI
219 // sender to make the original buffer available to the application ASAP
221 //It seems that the request is used after the call there this should be free somewhere else but where???
222 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
223 comm->src_buff = nullptr;
229 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
231 /* nothing done in this version */
234 static void smpi_check_options()
236 //check correctness of MPI parameters
238 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
239 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
241 if (simgrid::config::is_default("smpi/host-speed")) {
242 XBT_INFO("You did not set the power of the host running the simulation. "
243 "The timings will certainly not be accurate. "
244 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
245 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
248 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
249 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
250 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
254 return not process_data.empty();
257 void smpi_global_init()
259 if (not MC_is_active()) {
260 global_timer = xbt_os_timer_new();
261 xbt_os_walltimer_start(global_timer);
264 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
265 if (not filename.empty()) {
266 std::ifstream fstream(filename);
267 if (not fstream.is_open()) {
268 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
272 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
273 std::getline(fstream, line); // Skip the header line
274 while (std::getline(fstream, line)) {
276 Tokenizer::iterator it = tok.begin();
277 Tokenizer::iterator end = std::next(tok.begin());
279 std::string location = *it;
280 boost::trim(location);
281 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
286 // This map holds for each computation unit (such as "default" or "process1" etc.)
287 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
288 // and the (computed) event_set.
290 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
291 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
292 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
293 " Expected version is %u", PAPI_VER_CURRENT);
295 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
296 boost::char_separator<char> separator_units(";");
297 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
298 Tokenizer tokens(str, separator_units);
300 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
301 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
302 for (auto const& unit_it : tokens) {
303 boost::char_separator<char> separator_events(":");
304 Tokenizer event_tokens(unit_it, separator_events);
306 int event_set = PAPI_NULL;
307 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
308 // TODO: Should this let the whole simulation die?
309 XBT_CRITICAL("Could not create PAPI event set during init.");
312 // NOTE: We cannot use a map here, as we must obey the order of the counters
313 // This is important for PAPI: We need to map the values of counters back
314 // to the event_names (so, when PAPI_read() has finished)!
315 papi_counter_t counters2values;
317 // Iterate over all counters that were specified for this specific
319 // Note that we need to remove the name of the unit
320 // (that could also be the "default" value), which always comes first.
321 // Hence, we start at ++(events.begin())!
322 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
324 int event_code = PAPI_NULL;
325 char* event_name = const_cast<char*>((*events_it).c_str());
326 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
327 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
328 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
331 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
334 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
338 counters2values.push_back(
339 // We cannot just pass *events_it, as this is of type const basic_string
340 std::make_pair<std::string, long long>(std::string(*events_it), 0));
343 std::string unit_name = *(event_tokens.begin());
344 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
346 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
352 void smpi_global_destroy()
354 smpi_bench_destroy();
355 smpi_shared_destroy();
356 smpi_deployment_cleanup_instances();
358 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
359 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
361 MPI_COMM_WORLD = MPI_COMM_NULL;
363 if (not MC_is_active()) {
364 xbt_os_timer_free(global_timer);
367 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
368 smpi_destroy_global_memory_segments();
370 if(simgrid::smpi::F2C::lookup() != nullptr)
371 simgrid::smpi::F2C::delete_lookup();
374 static void smpi_init_options(){
375 // return if already called
376 if (smpi_cpu_threshold > -1)
378 simgrid::smpi::Colls::set_collectives();
379 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
380 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
381 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
382 xbt_assert(smpi_host_speed > 0.0, "You're trying to set the host_speed to a non-positive value (given: %f)", smpi_host_speed);
383 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
384 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
385 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
386 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
387 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
388 else if (smpi_privatize_option == "mmap")
389 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
390 else if (smpi_privatize_option == "dlopen")
391 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
393 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
395 if (not SMPI_switch_data_segment) {
396 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
397 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
399 #if !HAVE_WORKING_MMAP
400 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
401 XBT_INFO("mmap privatization is broken on this platform, switching to dlopen privatization instead.");
402 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
406 if (smpi_cpu_threshold < 0)
407 smpi_cpu_threshold = DBL_MAX;
409 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
410 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
411 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
412 } else if (val == "local") {
413 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
414 } else if ((val == "no") || (val == "0") || (val == "off")) {
415 smpi_cfg_shared_malloc = SharedMallocType::NONE;
417 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
422 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
423 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
424 typedef void (*smpi_fortran_entry_point_type)();
426 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
428 char noarg[] = {'\0'};
429 int argc = args.size();
430 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
431 for (int i = 0; i != argc; ++i)
432 argv[i] = args[i].empty() ? noarg : &args[i].front();
433 argv[argc] = nullptr;
434 char ** argvptr=argv.get();
435 simgrid::smpi::ActorExt::init(&argc, &argvptr);
436 #if defined(__INTEL_COMPILER) || defined(__ICC)
437 for_rtl_init_ (&argc, argvptr);
438 #elif defined(__GNUC__)
439 _gfortran_set_args(argc, argvptr);
440 #elif defined(__FLANG)
442 __io_set_argv(argvptr);
444 int res = entry_point(argc, argvptr);
446 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
447 if (smpi_exit_status == 0)
448 smpi_exit_status = res;
454 // TODO, remove the number of functions involved here
455 static smpi_entry_point_type smpi_resolve_function(void* handle)
457 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
458 if (entry_point_fortran != nullptr) {
459 return [entry_point_fortran](int argc, char** argv) {
460 entry_point_fortran();
465 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
466 if (entry_point != nullptr) {
470 return smpi_entry_point_type();
473 static void smpi_copy_file(std::string src, std::string target, off_t fdin_size)
475 int fdin = open(src.c_str(), O_RDONLY);
476 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
477 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
478 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
480 XBT_DEBUG("Copy %ld bytes into %s", static_cast<long>(fdin_size), target.c_str());
482 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
483 xbt_assert(sent_size == fdin_size, "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
484 target.c_str(), sent_size, fdin_size, errno, strerror(errno));
486 const int bufsize = 1024 * 1024 * 4;
488 while (int got = read(fdin, buf, bufsize)) {
490 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
494 while (int done = write(fdout, p, todo)) {
496 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
509 #if not defined(__APPLE__)
510 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
512 char* libname = (char*)(data);
513 const char *path = info->dlpi_name;
514 if(strstr(path, libname)){
515 strncpy(libname, path, 512);
523 static void smpi_init_privatization_dlopen(std::string executable)
525 // Prepare the copy of the binary (get its size)
526 struct stat fdin_stat;
527 stat(executable.c_str(), &fdin_stat);
528 off_t fdin_size = fdin_stat.st_size;
529 static std::size_t rank = 0;
531 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
532 if (not libnames.empty()) {
534 std::vector<std::string> privatize_libs;
535 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
537 for (auto const& libname : privatize_libs) {
538 // load the library once to add it to the local libs, to get the absolute path
539 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
540 // get library name from path
541 char fullpath[512] = {'\0'};
542 strcpy(fullpath, libname.c_str());
543 #if not defined(__APPLE__)
544 int ret = dl_iterate_phdr(visit_libs, fullpath);
546 xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-libs", fullpath);
548 XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
550 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX");
552 privatize_libs_paths.push_back(fullpath);
557 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
558 return std::function<void()>([executable, fdin_size, args] {
560 // Copy the dynamic library:
561 std::string target_executable =
562 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
564 smpi_copy_file(executable, target_executable, fdin_size);
565 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
566 std::string target_lib;
567 for (auto const& libpath : privatize_libs_paths) {
568 // if we were given a full path, strip it
569 size_t index = libpath.find_last_of("/\\");
571 if (index != std::string::npos)
572 libname = libpath.substr(index + 1);
574 if (not libname.empty()) {
575 // load the library to add it to the local libs, to get the absolute path
576 struct stat fdin_stat2;
577 stat(libpath.c_str(), &fdin_stat2);
578 off_t fdin_size2 = fdin_stat2.st_size;
580 // Copy the dynamic library, the new name must be the same length as the old one
581 // just replace the name with 7 digits for the rank and the rest of the name.
582 unsigned int pad = 7;
583 if (libname.length() < pad)
584 pad = libname.length();
586 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
587 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
588 smpi_copy_file(libpath, target_lib, fdin_size2);
590 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
591 int ret = system(sedcommand.c_str());
593 xbt_die("error while applying sed command %s \n", sedcommand.c_str());
598 // Load the copy and resolve the entry point:
599 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
600 int saved_errno = errno;
601 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
602 unlink(target_executable.c_str());
603 if (not target_lib.empty())
604 unlink(target_lib.c_str());
606 if (handle == nullptr)
607 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
608 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
610 xbt_die("Could not resolve entry point");
611 smpi_run_entry_point(entry_point, args);
616 static void smpi_init_privatization_no_dlopen(std::string executable)
618 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
619 smpi_prepare_global_memory_segment();
620 // Load the dynamic library and resolve the entry point:
621 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
622 if (handle == nullptr)
623 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno, strerror(errno));
624 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
626 xbt_die("main not found in %s", executable.c_str());
627 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
628 smpi_backup_global_memory_segment();
630 // Execute the same entry point for each simulated process:
631 simix_global->default_function = [entry_point](std::vector<std::string> args) {
632 return std::function<void()>([entry_point, args] { smpi_run_entry_point(entry_point, args); });
636 int smpi_main(const char* executable, int argc, char* argv[])
638 srand(SMPI_RAND_SEED);
640 if (getenv("SMPI_PRETEND_CC") != nullptr) {
641 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
642 * configuration tools */
647 SIMIX_global_init(&argc, argv);
649 SMPI_switch_data_segment = &smpi_switch_data_segment;
651 // TODO This will not be executed in the case where smpi_main is not called,
652 // e.g., not for smpi_msg_masterslave. This should be moved to another location
653 // that is always called -- maybe close to Actor::on_creation?
654 simgrid::s4u::Host::on_creation.connect(
655 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
657 // parse the platform file: get the host list
658 simgrid::s4u::Engine::get_instance()->load_platform(argv[1]);
659 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
662 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
663 smpi_init_privatization_dlopen(executable);
665 smpi_init_privatization_no_dlopen(executable);
668 simgrid::s4u::Engine::get_instance()->load_deployment(argv[2]);
669 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
670 process_data.size()); // This call has a side effect on process_count...
671 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
672 smpi_universe_size = process_count;
675 /* Clean IO before the run */
679 if (MC_is_active()) {
685 xbt_os_walltimer_stop(global_timer);
686 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
687 double global_time = xbt_os_timer_elapsed(global_timer);
688 XBT_INFO("Simulated time: %g seconds. \n\n"
689 "The simulation took %g seconds (after parsing and platform setup)\n"
690 "%g seconds were actual computation of the application",
691 SIMIX_get_clock(), global_time , smpi_total_benched_time);
693 if (smpi_total_benched_time/global_time>=0.75)
694 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
695 "You may want to use sampling functions or trace replay to reduce this.");
698 smpi_global_destroy();
700 return smpi_exit_status;
703 // Called either directly from the user code, or from the code called by smpirun
705 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::ActorPtr actor) {
706 if (not actor->is_daemon()) {
707 process_data.insert({actor, new simgrid::smpi::ActorExt(actor, nullptr)});
710 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::ActorPtr actor) {
711 auto it = process_data.find(actor);
712 if (it != process_data.end()) {
714 process_data.erase(it);
720 smpi_check_options();
723 void SMPI_finalize(){
724 smpi_global_destroy();
727 void smpi_mpi_init() {
728 smpi_init_fortran_types();
729 if(smpi_init_sleep > 0)
730 simcall_process_sleep(smpi_init_sleep);
733 double smpi_mpi_wtime(){
735 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
737 time = SIMIX_get_clock();
738 // to avoid deadlocks if used as a break condition, such as
739 // while (MPI_Wtime(...) < time_limit) {
742 // because the time will not normally advance when only calls to MPI_Wtime
743 // are made -> deadlock (MPI_Wtime never reaches the time limit)
744 if(smpi_wtime_sleep > 0)
745 simcall_process_sleep(smpi_wtime_sleep);
748 time = SIMIX_get_clock();