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. */
6 #include "smpi_host.hpp"
8 #include "simgrid/s4u/Engine.hpp"
9 #include "smpi_coll.hpp"
10 #include "smpi_process.hpp"
11 #include "src/msg/msg_private.hpp"
12 #include "src/simix/smx_private.hpp"
13 #include "xbt/config.hpp"
15 #include <cfloat> /* DBL_MAX */
20 #if not defined(__APPLE__)
24 #if defined(__APPLE__)
25 # include <AvailabilityMacros.h>
26 # ifndef MAC_OS_X_VERSION_10_12
27 # define MAC_OS_X_VERSION_10_12 101200
29 # define HAVE_WORKING_MMAP (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12)
30 #elif defined(__FreeBSD__)
31 # define HAVE_WORKING_MMAP 0
33 # define HAVE_WORKING_MMAP 1
37 #include <sys/sendfile.h>
40 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
41 #include <boost/tokenizer.hpp>
42 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
45 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
46 * See https://www.akkadia.org/drepper/dsohowto.pdf
47 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
49 #define RTLD_DEEPBIND 0
54 std::string papi_default_config_name = "default";
55 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
58 using simgrid::s4u::Actor;
59 using simgrid::s4u::ActorPtr;
60 std::unordered_map<std::string, double> location2speedup;
62 static std::map</*process_id*/ ActorPtr, simgrid::smpi::Process*> process_data;
63 int process_count = 0;
64 static int smpi_exit_status = 0;
65 int smpi_universe_size = 0;
66 extern double smpi_total_benched_time;
67 xbt_os_timer_t global_timer;
68 static std::vector<std::string> privatize_libs_paths;
70 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
71 * is important because the implementation of MPI_Comm checks
72 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
74 * This is basically how we only have one global variable but all processes have
75 * different communicators (the one their SMPI instance uses).
77 * See smpi_comm.cpp and the functions therein for details.
79 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
80 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
81 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
82 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
83 // No instance gets manually created; check also the smpirun.in script as
84 // this default name is used there as well (when the <actor> tag is generated).
85 static const std::string smpi_default_instance_name("smpirun");
86 static simgrid::config::Flag<double> smpi_wtime_sleep(
87 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
88 static simgrid::config::Flag<double> smpi_init_sleep(
89 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
91 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
93 int smpi_process_count()
98 simgrid::smpi::Process* smpi_process()
100 ActorPtr me = Actor::self();
101 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
103 simgrid::msg::ActorExt* msgExt = static_cast<simgrid::msg::ActorExt*>(me->get_impl()->get_user_data());
104 return static_cast<simgrid::smpi::Process*>(msgExt->data);
107 simgrid::smpi::Process* smpi_process_remote(ActorPtr actor)
109 return process_data.at(actor);
112 MPI_Comm smpi_process_comm_self(){
113 return smpi_process()->comm_self();
116 void smpi_process_init(int *argc, char ***argv){
117 simgrid::smpi::Process::init(argc, argv);
120 int smpi_process_index(){
121 return simgrid::s4u::this_actor::get_pid();
124 void * smpi_process_get_user_data(){
125 return smpi_process()->get_user_data();
128 void smpi_process_set_user_data(void *data){
129 return smpi_process()->set_user_data(data);
133 int smpi_global_size()
135 char *value = getenv("SMPI_GLOBAL_SIZE");
136 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
138 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
141 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
143 smpi_comm_copy_data_callback = callback;
146 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
148 for (auto const& block : private_blocks)
149 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
152 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
153 for (auto const& block : private_blocks)
154 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
157 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
159 simgrid::kernel::activity::CommImplPtr comm =
160 boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(synchro);
163 size_t src_offset = 0;
164 size_t dst_offset = 0;
165 std::vector<std::pair<size_t, size_t>> src_private_blocks;
166 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
167 XBT_DEBUG("Copy the data over");
168 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
169 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
170 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
173 src_private_blocks.clear();
174 src_private_blocks.push_back(std::make_pair(0, buff_size));
176 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
177 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
178 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
181 dst_private_blocks.clear();
182 dst_private_blocks.push_back(std::make_pair(0, buff_size));
184 check_blocks(src_private_blocks, buff_size);
185 check_blocks(dst_private_blocks, buff_size);
186 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
187 check_blocks(private_blocks, buff_size);
189 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
190 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
191 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
192 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
193 smpi_switch_data_segment(comm->src_proc->iface());
194 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
195 memcpy_private(tmpbuff, buff, private_blocks);
198 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) && ((char*)comm->dst_buff >= smpi_data_exe_start) &&
199 ((char*)comm->dst_buff < smpi_data_exe_start + smpi_data_exe_size)) {
200 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
201 smpi_switch_data_segment(comm->dst_proc->iface());
203 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
204 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
206 if (comm->detached) {
207 // if this is a detached send, the source buffer was duplicated by SMPI
208 // sender to make the original buffer available to the application ASAP
210 //It seems that the request is used after the call there this should be free somewhere else but where???
211 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
212 comm->src_buff = nullptr;
218 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
220 /* nothing done in this version */
223 static void smpi_check_options()
225 //check correctness of MPI parameters
227 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
228 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
230 if (simgrid::config::is_default("smpi/host-speed")) {
231 XBT_INFO("You did not set the power of the host running the simulation. "
232 "The timings will certainly not be accurate. "
233 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
234 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
237 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
238 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
239 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
243 return not process_data.empty();
246 void smpi_global_init()
248 if (not MC_is_active()) {
249 global_timer = xbt_os_timer_new();
250 xbt_os_walltimer_start(global_timer);
253 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
254 if (not filename.empty()) {
255 std::ifstream fstream(filename);
256 if (not fstream.is_open()) {
257 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
261 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
262 std::getline(fstream, line); // Skip the header line
263 while (std::getline(fstream, line)) {
265 Tokenizer::iterator it = tok.begin();
266 Tokenizer::iterator end = std::next(tok.begin());
268 std::string location = *it;
269 boost::trim(location);
270 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
275 // This map holds for each computation unit (such as "default" or "process1" etc.)
276 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
277 // and the (computed) event_set.
279 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
280 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
281 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
282 " Expected version is %u", PAPI_VER_CURRENT);
284 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
285 boost::char_separator<char> separator_units(";");
286 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
287 Tokenizer tokens(str, separator_units);
289 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
290 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
291 for (auto const& unit_it : tokens) {
292 boost::char_separator<char> separator_events(":");
293 Tokenizer event_tokens(unit_it, separator_events);
295 int event_set = PAPI_NULL;
296 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
297 // TODO: Should this let the whole simulation die?
298 XBT_CRITICAL("Could not create PAPI event set during init.");
301 // NOTE: We cannot use a map here, as we must obey the order of the counters
302 // This is important for PAPI: We need to map the values of counters back
303 // to the event_names (so, when PAPI_read() has finished)!
304 papi_counter_t counters2values;
306 // Iterate over all counters that were specified for this specific
308 // Note that we need to remove the name of the unit
309 // (that could also be the "default" value), which always comes first.
310 // Hence, we start at ++(events.begin())!
311 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
313 int event_code = PAPI_NULL;
314 char* event_name = const_cast<char*>((*events_it).c_str());
315 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
316 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
317 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
320 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
323 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
327 counters2values.push_back(
328 // We cannot just pass *events_it, as this is of type const basic_string
329 std::make_pair<std::string, long long>(std::string(*events_it), 0));
332 std::string unit_name = *(event_tokens.begin());
333 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
335 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
341 void smpi_global_destroy()
343 smpi_bench_destroy();
344 smpi_shared_destroy();
345 smpi_deployment_cleanup_instances();
347 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
348 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
350 MPI_COMM_WORLD = MPI_COMM_NULL;
352 if (not MC_is_active()) {
353 xbt_os_timer_free(global_timer);
356 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
357 smpi_destroy_global_memory_segments();
361 static void smpi_init_options(){
362 // return if already called
363 if (smpi_cpu_threshold > -1)
365 simgrid::smpi::Colls::set_collectives();
366 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
367 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
368 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
369 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);
370 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
371 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
372 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
373 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
374 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
375 else if (smpi_privatize_option == "mmap")
376 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
377 else if (smpi_privatize_option == "dlopen")
378 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
380 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
382 if (not SMPI_switch_data_segment) {
383 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
384 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
386 #if !HAVE_WORKING_MMAP
387 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
388 XBT_INFO("mmap privatization is broken on this platform, switching to dlopen privatization instead.");
389 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
393 if (smpi_cpu_threshold < 0)
394 smpi_cpu_threshold = DBL_MAX;
396 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
397 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
398 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
399 } else if (val == "local") {
400 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
401 } else if ((val == "no") || (val == "0") || (val == "off")) {
402 smpi_cfg_shared_malloc = SharedMallocType::NONE;
404 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
409 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
410 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
411 typedef void (*smpi_fortran_entry_point_type)();
413 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
415 char noarg[] = {'\0'};
416 const int argc = args.size();
417 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
418 for (int i = 0; i != argc; ++i)
419 argv[i] = args[i].empty() ? noarg : &args[i].front();
420 argv[argc] = nullptr;
422 int res = entry_point(argc, argv.get());
424 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
425 if (smpi_exit_status == 0)
426 smpi_exit_status = res;
432 // TODO, remove the number of functions involved here
433 static smpi_entry_point_type smpi_resolve_function(void* handle)
435 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
436 if (entry_point_fortran != nullptr) {
437 return [entry_point_fortran](int argc, char** argv) {
438 smpi_process_init(&argc, &argv);
439 entry_point_fortran();
444 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
445 if (entry_point != nullptr) {
449 return smpi_entry_point_type();
452 static void smpi_copy_file(std::string src, std::string target, off_t fdin_size)
454 int fdin = open(src.c_str(), O_RDONLY);
455 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
456 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
457 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
459 XBT_DEBUG("Copy %ld bytes into %s", static_cast<long>(fdin_size), target.c_str());
461 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
462 xbt_assert(sent_size == fdin_size, "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
463 target.c_str(), sent_size, fdin_size, errno, strerror(errno));
465 const int bufsize = 1024 * 1024 * 4;
467 while (int got = read(fdin, buf, bufsize)) {
469 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
473 while (int done = write(fdout, p, todo)) {
475 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
488 #if not defined(__APPLE__)
489 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
491 char* libname = (char*)(data);
492 const char *path = info->dlpi_name;
493 if(strstr(path, libname)){
494 strncpy(libname, path, 512);
502 static void smpi_init_privatization_dlopen(std::string executable)
504 // Prepare the copy of the binary (get its size)
505 struct stat fdin_stat;
506 stat(executable.c_str(), &fdin_stat);
507 off_t fdin_size = fdin_stat.st_size;
508 static std::size_t rank = 0;
510 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
511 if (not libnames.empty()) {
513 std::vector<std::string> privatize_libs;
514 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
516 for (auto const& libname : privatize_libs) {
517 // load the library once to add it to the local libs, to get the absolute path
518 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
519 // get library name from path
520 char fullpath[512] = {'\0'};
521 strcpy(fullpath, libname.c_str());
522 #if not defined(__APPLE__)
523 int ret = dl_iterate_phdr(visit_libs, fullpath);
525 xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-libs", fullpath);
527 XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
529 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX");
531 privatize_libs_paths.push_back(fullpath);
536 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
537 return std::function<void()>([executable, fdin_size, args] {
539 // Copy the dynamic library:
540 std::string target_executable =
541 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
543 smpi_copy_file(executable, target_executable, fdin_size);
544 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
545 std::string target_lib;
546 for (auto const& libpath : privatize_libs_paths) {
547 // if we were given a full path, strip it
548 size_t index = libpath.find_last_of("/\\");
550 if (index != std::string::npos)
551 libname = libpath.substr(index + 1);
553 if (not libname.empty()) {
554 // load the library to add it to the local libs, to get the absolute path
555 struct stat fdin_stat2;
556 stat(libpath.c_str(), &fdin_stat2);
557 off_t fdin_size2 = fdin_stat2.st_size;
559 // Copy the dynamic library, the new name must be the same length as the old one
560 // just replace the name with 7 digits for the rank and the rest of the name.
561 unsigned int pad = 7;
562 if (libname.length() < pad)
563 pad = libname.length();
565 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
566 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
567 smpi_copy_file(libpath, target_lib, fdin_size2);
569 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
570 int ret = system(sedcommand.c_str());
572 xbt_die("error while applying sed command %s \n", sedcommand.c_str());
577 // Load the copy and resolve the entry point:
578 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
579 int saved_errno = errno;
580 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
581 unlink(target_executable.c_str());
582 if (not target_lib.empty())
583 unlink(target_lib.c_str());
585 if (handle == nullptr)
586 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
587 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
589 xbt_die("Could not resolve entry point");
590 smpi_run_entry_point(entry_point, args);
595 static void smpi_init_privatization_no_dlopen(std::string executable)
597 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
598 smpi_prepare_global_memory_segment();
599 // Load the dynamic library and resolve the entry point:
600 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
601 if (handle == nullptr)
602 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno, strerror(errno));
603 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
605 xbt_die("main not found in %s", executable.c_str());
606 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
607 smpi_backup_global_memory_segment();
609 // Execute the same entry point for each simulated process:
610 simix_global->default_function = [entry_point](std::vector<std::string> args) {
611 return std::function<void()>([entry_point, args] { smpi_run_entry_point(entry_point, args); });
615 int smpi_main(const char* executable, int argc, char* argv[])
617 srand(SMPI_RAND_SEED);
619 if (getenv("SMPI_PRETEND_CC") != nullptr) {
620 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
621 * configuration tools */
627 SIMIX_global_init(&argc, argv);
628 MSG_init(&argc, argv); // FIXME Remove this MSG call. Once it's removed, we can remove the msg header include as well
630 SMPI_switch_data_segment = &smpi_switch_data_segment;
632 // TODO This will not be executed in the case where smpi_main is not called,
633 // e.g., not for smpi_msg_masterslave. This should be moved to another location
634 // that is always called -- maybe close to Actor::onCreation?
635 simgrid::s4u::Host::on_creation.connect(
636 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
638 // parse the platform file: get the host list
639 SIMIX_create_environment(argv[1]);
640 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
643 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
644 smpi_init_privatization_dlopen(executable);
646 smpi_init_privatization_no_dlopen(executable);
649 SIMIX_launch_application(argv[2]);
650 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
651 process_data.size()); // This call has a side effect on process_count...
652 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
653 smpi_universe_size = process_count;
656 /* Clean IO before the run */
660 if (MC_is_active()) {
666 xbt_os_walltimer_stop(global_timer);
667 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
668 double global_time = xbt_os_timer_elapsed(global_timer);
669 XBT_INFO("Simulated time: %g seconds. \n\n"
670 "The simulation took %g seconds (after parsing and platform setup)\n"
671 "%g seconds were actual computation of the application",
672 SIMIX_get_clock(), global_time , smpi_total_benched_time);
674 if (smpi_total_benched_time/global_time>=0.75)
675 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
676 "You may want to use sampling functions or trace replay to reduce this.");
679 smpi_global_destroy();
681 return smpi_exit_status;
684 // Called either directly from the user code, or from the code called by smpirun
686 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::ActorPtr actor) {
687 if (not actor->is_daemon()) {
688 process_data.insert({actor, new simgrid::smpi::Process(actor, nullptr)});
691 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::ActorPtr actor) {
692 auto it = process_data.find(actor);
693 if (it != process_data.end()) {
695 process_data.erase(it);
701 smpi_check_options();
702 simgrid::s4u::on_simulation_end.connect(TRACE_smpi_release);
705 void SMPI_finalize(){
706 smpi_global_destroy();
709 void smpi_mpi_init() {
710 if(smpi_init_sleep > 0)
711 simcall_process_sleep(smpi_init_sleep);
714 double smpi_mpi_wtime(){
716 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
718 time = SIMIX_get_clock();
719 // to avoid deadlocks if used as a break condition, such as
720 // while (MPI_Wtime(...) < time_limit) {
723 // because the time will not normally advance when only calls to MPI_Wtime
724 // are made -> deadlock (MPI_Wtime never reaches the time limit)
725 if(smpi_wtime_sleep > 0)
726 simcall_process_sleep(smpi_wtime_sleep);
729 time = SIMIX_get_clock();