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"
17 #include <cfloat> /* DBL_MAX */
22 #if not defined(__APPLE__)
26 #if defined(__APPLE__)
27 # include <AvailabilityMacros.h>
28 # ifndef MAC_OS_X_VERSION_10_12
29 # define MAC_OS_X_VERSION_10_12 101200
31 # define HAVE_WORKING_MMAP (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12)
32 #elif defined(__FreeBSD__)
33 # define HAVE_WORKING_MMAP 0
35 # define HAVE_WORKING_MMAP 1
39 #include <sys/sendfile.h>
42 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
43 #include <boost/tokenizer.hpp>
44 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
47 extern "C" void for_rtl_init_ (int *, char **);
48 extern "C" void for_rtl_finish_ ();
50 extern "C" void __io_set_argc(int);
51 extern "C" void __io_set_argv(char **);
53 extern "C" void _gfortran_set_args(int, char **);
56 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
57 * See https://www.akkadia.org/drepper/dsohowto.pdf
58 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
60 #if !defined(RTLD_DEEPBIND) || HAVE_SANITIZER_ADDRESS || HAVE_SANITIZER_THREAD
61 #define WANT_RTLD_DEEPBIND 0
63 #define WANT_RTLD_DEEPBIND RTLD_DEEPBIND
68 std::string papi_default_config_name = "default";
69 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
72 using simgrid::s4u::Actor;
73 using simgrid::s4u::ActorPtr;
74 std::unordered_map<std::string, double> location2speedup;
76 static std::map</*process_id*/ ActorPtr, simgrid::smpi::ActorExt*> process_data;
77 int process_count = 0;
78 static int smpi_exit_status = 0;
79 int smpi_universe_size = 0;
80 extern double smpi_total_benched_time;
81 xbt_os_timer_t global_timer;
82 static std::vector<std::string> privatize_libs_paths;
84 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
85 * is important because the implementation of MPI_Comm checks
86 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
88 * This is basically how we only have one global variable but all processes have
89 * different communicators (the one their SMPI instance uses).
91 * See smpi_comm.cpp and the functions therein for details.
93 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
94 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
95 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
96 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
97 // No instance gets manually created; check also the smpirun.in script as
98 // this default name is used there as well (when the <actor> tag is generated).
99 static const std::string smpi_default_instance_name("smpirun");
100 static simgrid::config::Flag<double> smpi_init_sleep(
101 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
103 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
105 int smpi_process_count()
107 return process_count;
110 simgrid::smpi::ActorExt* smpi_process()
112 ActorPtr me = Actor::self();
114 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
117 return process_data.at(me);
120 simgrid::smpi::ActorExt* smpi_process_remote(ActorPtr actor)
122 return process_data.at(actor);
125 MPI_Comm smpi_process_comm_self(){
126 return smpi_process()->comm_self();
129 void smpi_process_init(int *argc, char ***argv){
130 simgrid::smpi::ActorExt::init(argc, argv);
133 void * smpi_process_get_user_data(){
134 return Actor::self()->get_impl()->get_user_data();
137 void smpi_process_set_user_data(void *data){
138 Actor::self()->get_impl()->set_user_data(data);
142 int smpi_global_size()
144 char *value = getenv("SMPI_GLOBAL_SIZE");
145 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
147 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
150 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
152 smpi_comm_copy_data_callback = callback;
155 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
157 for (auto const& block : private_blocks)
158 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
161 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
162 for (auto const& block : private_blocks)
163 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
166 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
168 simgrid::kernel::activity::CommImplPtr comm =
169 boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(synchro);
172 size_t src_offset = 0;
173 size_t dst_offset = 0;
174 std::vector<std::pair<size_t, size_t>> src_private_blocks;
175 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
176 XBT_DEBUG("Copy the data over");
177 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
178 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
179 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
182 src_private_blocks.clear();
183 src_private_blocks.push_back(std::make_pair(0, buff_size));
185 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
186 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
187 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
190 dst_private_blocks.clear();
191 dst_private_blocks.push_back(std::make_pair(0, buff_size));
193 check_blocks(src_private_blocks, buff_size);
194 check_blocks(dst_private_blocks, buff_size);
195 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
196 check_blocks(private_blocks, buff_size);
198 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
199 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
200 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
201 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
202 smpi_switch_data_segment(comm->src_proc->iface());
203 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
204 memcpy_private(tmpbuff, buff, private_blocks);
207 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) && ((char*)comm->dst_buff >= smpi_data_exe_start) &&
208 ((char*)comm->dst_buff < smpi_data_exe_start + smpi_data_exe_size)) {
209 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
210 smpi_switch_data_segment(comm->dst_proc->iface());
212 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
213 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
215 if (comm->detached) {
216 // if this is a detached send, the source buffer was duplicated by SMPI
217 // sender to make the original buffer available to the application ASAP
219 //It seems that the request is used after the call there this should be free somewhere else but where???
220 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
221 comm->src_buff = nullptr;
227 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
229 /* nothing done in this version */
232 static void smpi_check_options()
234 //check correctness of MPI parameters
236 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
237 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
239 if (simgrid::config::is_default("smpi/host-speed")) {
240 XBT_INFO("You did not set the power of the host running the simulation. "
241 "The timings will certainly not be accurate. "
242 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
243 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
246 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
247 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
248 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
252 return not process_data.empty();
255 void smpi_global_init()
257 if (not MC_is_active()) {
258 global_timer = xbt_os_timer_new();
259 xbt_os_walltimer_start(global_timer);
262 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
263 if (not filename.empty()) {
264 std::ifstream fstream(filename);
265 if (not fstream.is_open()) {
266 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
270 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
271 std::getline(fstream, line); // Skip the header line
272 while (std::getline(fstream, line)) {
274 Tokenizer::iterator it = tok.begin();
275 Tokenizer::iterator end = std::next(tok.begin());
277 std::string location = *it;
278 boost::trim(location);
279 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
284 // This map holds for each computation unit (such as "default" or "process1" etc.)
285 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
286 // and the (computed) event_set.
288 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
289 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
290 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
291 " Expected version is %u", PAPI_VER_CURRENT);
293 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
294 boost::char_separator<char> separator_units(";");
295 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
296 Tokenizer tokens(str, separator_units);
298 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
299 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
300 for (auto const& unit_it : tokens) {
301 boost::char_separator<char> separator_events(":");
302 Tokenizer event_tokens(unit_it, separator_events);
304 int event_set = PAPI_NULL;
305 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
306 // TODO: Should this let the whole simulation die?
307 XBT_CRITICAL("Could not create PAPI event set during init.");
310 // NOTE: We cannot use a map here, as we must obey the order of the counters
311 // This is important for PAPI: We need to map the values of counters back
312 // to the event_names (so, when PAPI_read() has finished)!
313 papi_counter_t counters2values;
315 // Iterate over all counters that were specified for this specific
317 // Note that we need to remove the name of the unit
318 // (that could also be the "default" value), which always comes first.
319 // Hence, we start at ++(events.begin())!
320 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
322 int event_code = PAPI_NULL;
323 char* event_name = const_cast<char*>((*events_it).c_str());
324 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
325 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
326 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
329 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
332 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
336 counters2values.push_back(
337 // We cannot just pass *events_it, as this is of type const basic_string
338 std::make_pair<std::string, long long>(std::string(*events_it), 0));
341 std::string unit_name = *(event_tokens.begin());
342 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
344 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
350 void smpi_global_destroy()
352 smpi_bench_destroy();
353 smpi_shared_destroy();
354 smpi_deployment_cleanup_instances();
356 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
357 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
359 MPI_COMM_WORLD = MPI_COMM_NULL;
361 if (not MC_is_active()) {
362 xbt_os_timer_free(global_timer);
365 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
366 smpi_destroy_global_memory_segments();
368 if(simgrid::smpi::F2C::lookup() != nullptr)
369 simgrid::smpi::F2C::delete_lookup();
372 static void smpi_init_options(){
373 // return if already called
374 if (smpi_cpu_threshold > -1)
376 simgrid::smpi::Colls::set_collectives();
377 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
378 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
379 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
380 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);
381 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
382 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
383 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
384 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
385 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
386 else if (smpi_privatize_option == "mmap")
387 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
388 else if (smpi_privatize_option == "dlopen")
389 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
391 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
393 if (not SMPI_switch_data_segment) {
394 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
395 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
397 #if !HAVE_WORKING_MMAP
398 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
399 XBT_INFO("mmap privatization is broken on this platform, switching to dlopen privatization instead.");
400 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
404 if (smpi_cpu_threshold < 0)
405 smpi_cpu_threshold = DBL_MAX;
407 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
408 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
409 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
410 } else if (val == "local") {
411 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
412 } else if ((val == "no") || (val == "0") || (val == "off")) {
413 smpi_cfg_shared_malloc = SharedMallocType::NONE;
415 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
420 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
421 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
422 typedef void (*smpi_fortran_entry_point_type)();
424 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
426 // copy C strings, we need them writable
427 std::vector<char*>* args4argv = new std::vector<char*>(args.size());
428 std::transform(begin(args), end(args), begin(*args4argv), [](const std::string& s) { return xbt_strdup(s.c_str()); });
431 // take a copy of args4argv to keep reference of the allocated strings
432 const std::vector<char*> args2str(*args4argv);
434 int argc = args4argv->size();
435 args4argv->push_back(nullptr);
436 char** argv = args4argv->data();
438 simgrid::smpi::ActorExt::init(&argc, &argv);
440 for_rtl_init_ (&argc, argv);
445 _gfortran_set_args(argc, argv);
447 int res = entry_point(argc, argv);
452 for (char* s : args2str)
458 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
459 if (smpi_exit_status == 0)
460 smpi_exit_status = res;
466 // TODO, remove the number of functions involved here
467 static smpi_entry_point_type smpi_resolve_function(void* handle)
469 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
470 if (entry_point_fortran != nullptr) {
471 return [entry_point_fortran](int argc, char** argv) {
472 entry_point_fortran();
477 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
478 if (entry_point != nullptr) {
482 return smpi_entry_point_type();
485 static void smpi_copy_file(std::string src, std::string target, off_t fdin_size)
487 int fdin = open(src.c_str(), O_RDONLY);
488 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
489 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
490 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
492 XBT_DEBUG("Copy %ld bytes into %s", static_cast<long>(fdin_size), target.c_str());
494 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
495 xbt_assert(sent_size == fdin_size, "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
496 target.c_str(), sent_size, fdin_size, errno, strerror(errno));
498 const int bufsize = 1024 * 1024 * 4;
500 while (int got = read(fdin, buf, bufsize)) {
502 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
506 while (int done = write(fdout, p, todo)) {
508 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
521 #if not defined(__APPLE__)
522 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
524 char* libname = (char*)(data);
525 const char *path = info->dlpi_name;
526 if(strstr(path, libname)){
527 strncpy(libname, path, 512);
535 static void smpi_init_privatization_dlopen(std::string executable)
537 // Prepare the copy of the binary (get its size)
538 struct stat fdin_stat;
539 stat(executable.c_str(), &fdin_stat);
540 off_t fdin_size = fdin_stat.st_size;
541 static std::size_t rank = 0;
543 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
544 if (not libnames.empty()) {
546 std::vector<std::string> privatize_libs;
547 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
549 for (auto const& libname : privatize_libs) {
550 // load the library once to add it to the local libs, to get the absolute path
551 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
552 // get library name from path
553 char fullpath[512] = {'\0'};
554 strcpy(fullpath, libname.c_str());
555 #if not defined(__APPLE__)
556 int ret = dl_iterate_phdr(visit_libs, fullpath);
558 xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-libs", fullpath);
560 XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
562 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX");
564 privatize_libs_paths.push_back(fullpath);
569 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
570 return std::function<void()>([executable, fdin_size, args] {
572 // Copy the dynamic library:
573 std::string target_executable =
574 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
576 smpi_copy_file(executable, target_executable, fdin_size);
577 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
578 std::vector<std::string> target_libs;
579 for (auto const& libpath : privatize_libs_paths) {
580 // if we were given a full path, strip it
581 size_t index = libpath.find_last_of("/\\");
583 if (index != std::string::npos)
584 libname = libpath.substr(index + 1);
586 if (not libname.empty()) {
587 // load the library to add it to the local libs, to get the absolute path
588 struct stat fdin_stat2;
589 stat(libpath.c_str(), &fdin_stat2);
590 off_t fdin_size2 = fdin_stat2.st_size;
592 // Copy the dynamic library, the new name must be the same length as the old one
593 // just replace the name with 7 digits for the rank and the rest of the name.
594 unsigned int pad = 7;
595 if (libname.length() < pad)
596 pad = libname.length();
597 std::string target_lib =
598 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
599 target_libs.push_back(target_lib);
600 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
601 smpi_copy_file(libpath, target_lib, fdin_size2);
603 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
604 int ret = system(sedcommand.c_str());
606 xbt_die("error while applying sed command %s \n", sedcommand.c_str());
611 // Load the copy and resolve the entry point:
612 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | WANT_RTLD_DEEPBIND);
613 int saved_errno = errno;
614 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
615 unlink(target_executable.c_str());
616 for (const std::string& target_lib : target_libs)
617 unlink(target_lib.c_str());
619 if (handle == nullptr)
620 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
621 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
623 xbt_die("Could not resolve entry point");
624 smpi_run_entry_point(entry_point, args);
629 static void smpi_init_privatization_no_dlopen(std::string executable)
631 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
632 smpi_prepare_global_memory_segment();
633 // Load the dynamic library and resolve the entry point:
634 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
635 if (handle == nullptr)
636 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno, strerror(errno));
637 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
639 xbt_die("main not found in %s", executable.c_str());
640 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
641 smpi_backup_global_memory_segment();
643 // Execute the same entry point for each simulated process:
644 simix_global->default_function = [entry_point](std::vector<std::string> args) {
645 return std::function<void()>([entry_point, args] { smpi_run_entry_point(entry_point, args); });
649 int smpi_main(const char* executable, int argc, char* argv[])
651 srand(SMPI_RAND_SEED);
653 if (getenv("SMPI_PRETEND_CC") != nullptr) {
654 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
655 * configuration tools */
660 SIMIX_global_init(&argc, argv);
662 SMPI_switch_data_segment = &smpi_switch_data_segment;
664 // TODO This will not be executed in the case where smpi_main is not called,
665 // e.g., not for smpi_msg_masterslave. This should be moved to another location
666 // that is always called -- maybe close to Actor::on_creation?
667 simgrid::s4u::Host::on_creation.connect(
668 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
670 // parse the platform file: get the host list
671 simgrid::s4u::Engine::get_instance()->load_platform(argv[1]);
672 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
675 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
676 smpi_init_privatization_dlopen(executable);
678 smpi_init_privatization_no_dlopen(executable);
681 simgrid::s4u::Engine::get_instance()->load_deployment(argv[2]);
682 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
683 process_data.size()); // This call has a side effect on process_count...
684 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
685 smpi_universe_size = process_count;
688 /* Clean IO before the run */
692 if (MC_is_active()) {
698 xbt_os_walltimer_stop(global_timer);
699 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
700 double global_time = xbt_os_timer_elapsed(global_timer);
701 XBT_INFO("Simulated time: %g seconds. \n\n"
702 "The simulation took %g seconds (after parsing and platform setup)\n"
703 "%g seconds were actual computation of the application",
704 SIMIX_get_clock(), global_time , smpi_total_benched_time);
706 if (smpi_total_benched_time/global_time>=0.75)
707 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
708 "You may want to use sampling functions or trace replay to reduce this.");
711 smpi_global_destroy();
713 return smpi_exit_status;
716 // Called either directly from the user code, or from the code called by smpirun
718 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::ActorPtr actor) {
719 if (not actor->is_daemon()) {
720 process_data.insert({actor, new simgrid::smpi::ActorExt(actor, nullptr)});
723 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::ActorPtr actor) {
724 auto it = process_data.find(actor);
725 if (it != process_data.end()) {
727 process_data.erase(it);
733 smpi_check_options();
736 void SMPI_finalize(){
737 smpi_global_destroy();
740 void smpi_mpi_init() {
741 smpi_init_fortran_types();
742 if(smpi_init_sleep > 0)
743 simcall_process_sleep(smpi_init_sleep);