1 /* Copyright (c) 2007-2019. 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 "simgrid/plugins/file_system.h"
9 #include "smpi_coll.hpp"
10 #include "smpi_f2c.hpp"
11 #include "smpi_host.hpp"
12 #include "src/kernel/activity/CommImpl.hpp"
13 #include "src/simix/smx_private.hpp"
14 #include "src/smpi/include/smpi_actor.hpp"
15 #include "xbt/config.hpp"
18 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
19 #include <boost/tokenizer.hpp>
20 #include <cfloat> /* DBL_MAX */
22 #include <cstdint> /* intmax_t */
29 #include <sys/sendfile.h>
36 #if not defined(__APPLE__) && not defined(__HAIKU__)
40 #if defined(__APPLE__)
41 # include <AvailabilityMacros.h>
42 # ifndef MAC_OS_X_VERSION_10_12
43 # define MAC_OS_X_VERSION_10_12 101200
45 constexpr bool HAVE_WORKING_MMAP = (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12);
46 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__sun) || defined(__HAIKU__)
47 constexpr bool HAVE_WORKING_MMAP = false;
49 constexpr bool HAVE_WORKING_MMAP = true;
52 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
55 extern "C" void for_rtl_init_ (int *, char **);
56 extern "C" void for_rtl_finish_ ();
58 extern "C" void __io_set_argc(int);
59 extern "C" void __io_set_argv(char **);
61 extern "C" void _gfortran_set_args(int, char **);
64 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
65 * See https://www.akkadia.org/drepper/dsohowto.pdf
66 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
68 #if !RTLD_DEEPBIND || HAVE_SANITIZER_ADDRESS || HAVE_SANITIZER_THREAD
69 #define WANT_RTLD_DEEPBIND 0
71 #define WANT_RTLD_DEEPBIND RTLD_DEEPBIND
75 std::string papi_default_config_name = "default";
76 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
79 std::unordered_map<std::string, double> location2speedup;
81 static std::map</*process_id*/ simgrid::s4u::Actor const*, simgrid::smpi::ActorExt*> process_data;
82 static int smpi_exit_status = 0;
83 extern double smpi_total_benched_time;
84 xbt_os_timer_t global_timer;
85 static std::vector<std::string> privatize_libs_paths;
87 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
88 * is important because the implementation of MPI_Comm checks
89 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
91 * This is basically how we only have one global variable but all processes have
92 * different communicators (the one their SMPI instance uses).
94 * See smpi_comm.cpp and the functions therein for details.
96 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
97 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
98 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
99 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
100 // No instance gets manually created; check also the smpirun.in script as
101 // this default name is used there as well (when the <actor> tag is generated).
102 static const std::string smpi_default_instance_name("smpirun");
103 static simgrid::config::Flag<double> smpi_init_sleep(
104 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
106 void (*smpi_comm_copy_data_callback)(simgrid::kernel::activity::CommImpl*, void*,
107 size_t) = &smpi_comm_copy_buffer_callback;
109 simgrid::smpi::ActorExt* smpi_process()
111 simgrid::s4u::ActorPtr me = simgrid::s4u::Actor::self();
113 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
116 return process_data.at(me.get());
119 simgrid::smpi::ActorExt* smpi_process_remote(simgrid::s4u::ActorPtr actor)
121 return process_data.at(actor.get());
124 MPI_Comm smpi_process_comm_self(){
125 return smpi_process()->comm_self();
128 MPI_Info smpi_process_info_env(){
129 return smpi_process()->info_env();
132 void * smpi_process_get_user_data(){
133 return simgrid::s4u::Actor::self()->get_impl()->get_user_data();
136 void smpi_process_set_user_data(void *data){
137 simgrid::s4u::Actor::self()->get_impl()->set_user_data(data);
140 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
142 static void (*saved_callback)(smx_activity_t, void*, size_t);
143 saved_callback = callback;
144 smpi_comm_copy_data_callback = [](simgrid::kernel::activity::CommImpl* comm, void* buff, size_t size) {
145 saved_callback(smx_activity_t(comm), buff, size);
149 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
151 for (auto const& block : private_blocks)
152 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
155 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
156 for (auto const& block : private_blocks)
157 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
160 void smpi_comm_copy_buffer_callback(simgrid::kernel::activity::CommImpl* comm, void* buff, size_t buff_size)
162 size_t src_offset = 0;
163 size_t dst_offset = 0;
164 std::vector<std::pair<size_t, size_t>> src_private_blocks;
165 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
166 XBT_DEBUG("Copy the data over");
167 if(smpi_is_shared(buff, src_private_blocks, &src_offset)) {
168 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
169 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
172 src_private_blocks.clear();
173 src_private_blocks.push_back(std::make_pair(0, buff_size));
175 if (smpi_is_shared((char*)comm->dst_buff_, dst_private_blocks, &dst_offset)) {
176 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff_);
177 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
180 dst_private_blocks.clear();
181 dst_private_blocks.push_back(std::make_pair(0, buff_size));
183 check_blocks(src_private_blocks, buff_size);
184 check_blocks(dst_private_blocks, buff_size);
185 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
186 check_blocks(private_blocks, buff_size);
188 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
189 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
190 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
191 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
192 smpi_switch_data_segment(comm->src_actor_->iface());
193 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
194 memcpy_private(tmpbuff, buff, private_blocks);
197 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
198 ((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_actor_->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(simgrid::kernel::activity::CommImpl*, void*, size_t)
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") && not MC_is_active()) {
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. "
235 "https://simgrid.org/doc/latest/Configuring_SimGrid.html#automatic-benchmarking-of-smpi-code for more "
239 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
240 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
241 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
245 return MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED;
248 void smpi_global_init()
250 if (not MC_is_active()) {
251 global_timer = xbt_os_timer_new();
252 xbt_os_walltimer_start(global_timer);
255 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
256 if (not filename.empty()) {
257 std::ifstream fstream(filename);
258 xbt_assert(fstream.is_open(), "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 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
319 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
320 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
323 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
325 counters2values.push_back(
326 // We cannot just pass *events_it, as this is of type const basic_string
327 std::make_pair<std::string, long long>(std::string(*events_it), 0));
330 std::string unit_name = *(event_tokens.begin());
331 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
333 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
339 void smpi_global_destroy()
341 smpi_bench_destroy();
342 smpi_shared_destroy();
343 smpi_deployment_cleanup_instances();
345 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
346 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
348 MPI_COMM_WORLD = MPI_COMM_NULL;
350 if (not MC_is_active()) {
351 xbt_os_timer_free(global_timer);
354 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
355 smpi_destroy_global_memory_segments();
356 if(simgrid::smpi::F2C::lookup() != nullptr)
357 simgrid::smpi::F2C::delete_lookup();
360 static void smpi_init_options(){
361 // return if already called
362 if (smpi_cpu_threshold > -1)
364 simgrid::smpi::Colls::set_collectives();
365 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
366 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
367 if (smpi_cpu_threshold < 0)
368 smpi_cpu_threshold = DBL_MAX;
370 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
371 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
372 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
373 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
374 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
375 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
376 else if (smpi_privatize_option == "mmap")
377 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
378 else if (smpi_privatize_option == "dlopen")
379 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
381 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
383 if (not SMPI_switch_data_segment) {
384 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
385 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
387 if (not HAVE_WORKING_MMAP && 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;
392 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
393 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
394 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
395 } else if (val == "local") {
396 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
397 } else if ((val == "no") || (val == "0") || (val == "off")) {
398 smpi_cfg_shared_malloc = SharedMallocType::NONE;
400 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
405 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
406 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
407 typedef void (*smpi_fortran_entry_point_type)();
409 template <typename F>
410 static int smpi_run_entry_point(const F& entry_point, const std::string& executable_path, std::vector<std::string> args)
412 // copy C strings, we need them writable
413 std::vector<char*>* args4argv = new std::vector<char*>(args.size());
414 std::transform(begin(args), end(args), begin(*args4argv), [](const std::string& s) { return xbt_strdup(s.c_str()); });
416 // set argv[0] to executable_path
417 xbt_free((*args4argv)[0]);
418 (*args4argv)[0] = xbt_strdup(executable_path.c_str());
421 // take a copy of args4argv to keep reference of the allocated strings
422 const std::vector<char*> args2str(*args4argv);
424 int argc = args4argv->size();
425 args4argv->push_back(nullptr);
426 char** argv = args4argv->data();
428 simgrid::smpi::ActorExt::init();
430 for_rtl_init_ (&argc, argv);
435 _gfortran_set_args(argc, argv);
437 int res = entry_point(argc, argv);
442 for (char* s : args2str)
448 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
449 if (smpi_exit_status == 0)
450 smpi_exit_status = res;
456 // TODO, remove the number of functions involved here
457 static smpi_entry_point_type smpi_resolve_function(void* handle)
459 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
460 if (entry_point_fortran != nullptr) {
461 return [entry_point_fortran](int, char**) {
462 entry_point_fortran();
467 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
468 if (entry_point != nullptr) {
472 return smpi_entry_point_type();
475 static void smpi_copy_file(const std::string& src, const std::string& target, off_t fdin_size)
477 int fdin = open(src.c_str(), O_RDONLY);
478 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
479 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
480 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
482 XBT_DEBUG("Copy %" PRIdMAX " bytes into %s", static_cast<intmax_t>(fdin_size), target.c_str());
484 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
485 if (sent_size == fdin_size) {
489 } else if (sent_size != -1 || errno != ENOSYS) {
490 xbt_die("Error while copying %s: only %zd bytes copied instead of %" PRIdMAX " (errno: %d -- %s)", target.c_str(),
491 sent_size, static_cast<intmax_t>(fdin_size), errno, strerror(errno));
494 // If this point is reached, sendfile() actually is not available. Copy file by hand.
495 const int bufsize = 1024 * 1024 * 4;
496 char* buf = new char[bufsize];
497 while (int got = read(fdin, buf, bufsize)) {
499 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
503 while (int done = write(fdout, p, todo)) {
505 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
518 #if not defined(__APPLE__) && not defined(__HAIKU__)
519 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
521 char* libname = (char*)(data);
522 const char *path = info->dlpi_name;
523 if(strstr(path, libname)){
524 strncpy(libname, path, 512);
532 static void smpi_init_privatization_dlopen(const std::string& executable)
534 // Prepare the copy of the binary (get its size)
535 struct stat fdin_stat;
536 stat(executable.c_str(), &fdin_stat);
537 off_t fdin_size = fdin_stat.st_size;
539 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
540 if (not libnames.empty()) {
542 std::vector<std::string> privatize_libs;
543 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
545 for (auto const& libname : privatize_libs) {
546 // load the library once to add it to the local libs, to get the absolute path
547 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
548 // get library name from path
549 char fullpath[512] = {'\0'};
550 strncpy(fullpath, libname.c_str(), 511);
551 #if not defined(__APPLE__) && not defined(__HAIKU__)
552 xbt_assert(0 != dl_iterate_phdr(visit_libs, fullpath),
553 "Can't find a linked %s - check your settings in smpi/privatize-libs", fullpath);
554 XBT_DEBUG("Extra lib to privatize '%s' found", fullpath);
556 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX nor with Haiku");
558 privatize_libs_paths.push_back(fullpath);
563 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
564 return std::function<void()>([executable, fdin_size, args] {
565 static std::size_t rank = 0;
566 // Copy the dynamic library:
567 std::string target_executable =
568 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
570 smpi_copy_file(executable, target_executable, fdin_size);
571 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
572 std::vector<std::string> target_libs;
573 for (auto const& libpath : privatize_libs_paths) {
574 // if we were given a full path, strip it
575 size_t index = libpath.find_last_of("/\\");
577 if (index != std::string::npos)
578 libname = libpath.substr(index + 1);
580 if (not libname.empty()) {
581 // load the library to add it to the local libs, to get the absolute path
582 struct stat fdin_stat2;
583 stat(libpath.c_str(), &fdin_stat2);
584 off_t fdin_size2 = fdin_stat2.st_size;
586 // Copy the dynamic library, the new name must be the same length as the old one
587 // just replace the name with 7 digits for the rank and the rest of the name.
588 unsigned int pad = 7;
589 if (libname.length() < pad)
590 pad = libname.length();
591 std::string target_lib =
592 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
593 target_libs.push_back(target_lib);
594 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
595 smpi_copy_file(libpath, target_lib, fdin_size2);
597 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
598 xbt_assert(system(sedcommand.c_str()) == 0, "error while applying sed command %s \n", sedcommand.c_str());
603 // Load the copy and resolve the entry point:
604 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | WANT_RTLD_DEEPBIND);
605 int saved_errno = errno;
606 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
607 unlink(target_executable.c_str());
608 for (const std::string& target_lib : target_libs)
609 unlink(target_lib.c_str());
611 xbt_assert(handle != nullptr, "dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno,
612 strerror(saved_errno));
614 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
615 xbt_assert(entry_point, "Could not resolve entry point");
616 smpi_run_entry_point(entry_point, executable, args);
621 static void smpi_init_privatization_no_dlopen(const std::string& executable)
623 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
624 smpi_prepare_global_memory_segment();
626 // Load the dynamic library and resolve the entry point:
627 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
628 xbt_assert(handle != nullptr, "dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno,
630 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
631 xbt_assert(entry_point, "main not found in %s", executable.c_str());
633 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
634 smpi_backup_global_memory_segment();
636 // Execute the same entry point for each simulated process:
637 simix_global->default_function = [entry_point, executable](std::vector<std::string> args) {
638 return std::function<void()>(
639 [entry_point, executable, args] { smpi_run_entry_point(entry_point, executable, args); });
643 int smpi_main(const char* executable, int argc, char* argv[])
645 if (getenv("SMPI_PRETEND_CC") != nullptr) {
646 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
647 * configuration tools */
652 SIMIX_global_init(&argc, argv);
654 SMPI_switch_data_segment = &smpi_switch_data_segment;
655 sg_storage_file_system_init();
656 // parse the platform file: get the host list
657 simgrid::s4u::Engine::get_instance()->load_platform(argv[1]);
658 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
661 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
662 smpi_init_privatization_dlopen(executable);
664 smpi_init_privatization_no_dlopen(executable);
667 simgrid::s4u::Engine::get_instance()->load_deployment(argv[2]);
668 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
669 process_data.size()); // This call has a side effect on process_count...
670 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
672 /* Clean IO before the run */
676 if (MC_is_active()) {
682 xbt_os_walltimer_stop(global_timer);
683 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
684 double global_time = xbt_os_timer_elapsed(global_timer);
685 XBT_INFO("Simulated time: %g seconds. \n\n"
686 "The simulation took %g seconds (after parsing and platform setup)\n"
687 "%g seconds were actual computation of the application",
688 SIMIX_get_clock(), global_time , smpi_total_benched_time);
690 if (smpi_total_benched_time/global_time>=0.75)
691 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
692 "You may want to use sampling functions or trace replay to reduce this.");
695 smpi_global_destroy();
697 return smpi_exit_status;
700 // Called either directly from the user code, or from the code called by smpirun
702 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::Actor& actor) {
703 if (not actor.is_daemon()) {
704 process_data.insert({&actor, new simgrid::smpi::ActorExt(&actor)});
707 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::Actor const& actor) {
708 auto it = process_data.find(&actor);
709 if (it != process_data.end()) {
711 process_data.erase(it);
714 simgrid::s4u::Host::on_creation.connect(
715 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
719 smpi_check_options();
722 void SMPI_finalize(){
723 smpi_global_destroy();
726 void smpi_mpi_init() {
727 smpi_init_fortran_types();
728 if(smpi_init_sleep > 0)
729 simcall_process_sleep(smpi_init_sleep);