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 "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 */
19 #include <cstdint> /* intmax_t */
24 #if not defined(__APPLE__)
28 #if defined(__APPLE__)
29 # include <AvailabilityMacros.h>
30 # ifndef MAC_OS_X_VERSION_10_12
31 # define MAC_OS_X_VERSION_10_12 101200
33 # define HAVE_WORKING_MMAP (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12)
34 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
35 # define HAVE_WORKING_MMAP 0
37 # define HAVE_WORKING_MMAP 1
41 #include <sys/sendfile.h>
44 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
45 #include <boost/tokenizer.hpp>
46 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
49 extern "C" void for_rtl_init_ (int *, char **);
50 extern "C" void for_rtl_finish_ ();
52 extern "C" void __io_set_argc(int);
53 extern "C" void __io_set_argv(char **);
55 extern "C" void _gfortran_set_args(int, char **);
58 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
59 * See https://www.akkadia.org/drepper/dsohowto.pdf
60 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
62 #if !RTLD_DEEPBIND || HAVE_SANITIZER_ADDRESS || HAVE_SANITIZER_THREAD
63 #define WANT_RTLD_DEEPBIND 0
65 #define WANT_RTLD_DEEPBIND RTLD_DEEPBIND
70 std::string papi_default_config_name = "default";
71 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
74 using simgrid::s4u::Actor;
75 using simgrid::s4u::ActorPtr;
76 std::unordered_map<std::string, double> location2speedup;
78 static std::map</*process_id*/ ActorPtr, simgrid::smpi::ActorExt*> process_data;
79 int process_count = 0;
80 static int smpi_exit_status = 0;
81 int smpi_universe_size = 0;
82 extern double smpi_total_benched_time;
83 xbt_os_timer_t global_timer;
84 static std::vector<std::string> privatize_libs_paths;
86 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
87 * is important because the implementation of MPI_Comm checks
88 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
90 * This is basically how we only have one global variable but all processes have
91 * different communicators (the one their SMPI instance uses).
93 * See smpi_comm.cpp and the functions therein for details.
95 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
96 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
97 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
98 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
99 // No instance gets manually created; check also the smpirun.in script as
100 // this default name is used there as well (when the <actor> tag is generated).
101 static const std::string smpi_default_instance_name("smpirun");
102 static simgrid::config::Flag<double> smpi_init_sleep(
103 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
105 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
107 int smpi_process_count()
109 return process_count;
112 simgrid::smpi::ActorExt* smpi_process()
114 ActorPtr me = Actor::self();
116 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
119 return process_data.at(me);
122 simgrid::smpi::ActorExt* smpi_process_remote(ActorPtr actor)
124 return process_data.at(actor);
127 MPI_Comm smpi_process_comm_self(){
128 return smpi_process()->comm_self();
131 void smpi_process_init(int *argc, char ***argv){
132 simgrid::smpi::ActorExt::init();
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_actor_->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) &&
210 ((char*)comm->dst_buff_ >= smpi_data_exe_start) &&
211 ((char*)comm->dst_buff_ < smpi_data_exe_start + smpi_data_exe_size)) {
212 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
213 smpi_switch_data_segment(comm->dst_actor_->iface());
215 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff, comm->dst_buff_);
216 memcpy_private(comm->dst_buff_, tmpbuff, private_blocks);
218 if (comm->detached) {
219 // if this is a detached send, the source buffer was duplicated by SMPI
220 // sender to make the original buffer available to the application ASAP
222 //It seems that the request is used after the call there this should be free somewhere else but where???
223 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
224 comm->src_buff_ = nullptr;
230 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
232 /* nothing done in this version */
235 static void smpi_check_options()
237 //check correctness of MPI parameters
239 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
240 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
242 if (simgrid::config::is_default("smpi/host-speed")) {
243 XBT_INFO("You did not set the power of the host running the simulation. "
244 "The timings will certainly not be accurate. "
245 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
246 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
249 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
250 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
251 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
255 return not process_data.empty();
258 void smpi_global_init()
260 if (not MC_is_active()) {
261 global_timer = xbt_os_timer_new();
262 xbt_os_walltimer_start(global_timer);
265 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
266 if (not filename.empty()) {
267 std::ifstream fstream(filename);
268 if (not fstream.is_open()) {
269 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
273 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
274 std::getline(fstream, line); // Skip the header line
275 while (std::getline(fstream, line)) {
277 Tokenizer::iterator it = tok.begin();
278 Tokenizer::iterator end = std::next(tok.begin());
280 std::string location = *it;
281 boost::trim(location);
282 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
287 // This map holds for each computation unit (such as "default" or "process1" etc.)
288 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
289 // and the (computed) event_set.
291 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
292 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
293 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
294 " Expected version is %u", PAPI_VER_CURRENT);
296 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
297 boost::char_separator<char> separator_units(";");
298 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
299 Tokenizer tokens(str, separator_units);
301 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
302 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
303 for (auto const& unit_it : tokens) {
304 boost::char_separator<char> separator_events(":");
305 Tokenizer event_tokens(unit_it, separator_events);
307 int event_set = PAPI_NULL;
308 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
309 // TODO: Should this let the whole simulation die?
310 XBT_CRITICAL("Could not create PAPI event set during init.");
313 // NOTE: We cannot use a map here, as we must obey the order of the counters
314 // This is important for PAPI: We need to map the values of counters back
315 // to the event_names (so, when PAPI_read() has finished)!
316 papi_counter_t counters2values;
318 // Iterate over all counters that were specified for this specific
320 // Note that we need to remove the name of the unit
321 // (that could also be the "default" value), which always comes first.
322 // Hence, we start at ++(events.begin())!
323 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
325 int event_code = PAPI_NULL;
326 char* event_name = const_cast<char*>((*events_it).c_str());
327 if (PAPI_event_name_to_code(event_name, &event_code) != PAPI_OK) {
328 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
331 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
332 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
335 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
337 counters2values.push_back(
338 // We cannot just pass *events_it, as this is of type const basic_string
339 std::make_pair<std::string, long long>(std::string(*events_it), 0));
342 std::string unit_name = *(event_tokens.begin());
343 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
345 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
351 void smpi_global_destroy()
353 smpi_bench_destroy();
354 smpi_shared_destroy();
355 smpi_deployment_cleanup_instances();
357 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
358 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
360 MPI_COMM_WORLD = MPI_COMM_NULL;
362 if (not MC_is_active()) {
363 xbt_os_timer_free(global_timer);
366 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
367 smpi_destroy_global_memory_segments();
369 if(simgrid::smpi::F2C::lookup() != nullptr)
370 simgrid::smpi::F2C::delete_lookup();
373 static void smpi_init_options(){
374 // return if already called
375 if (smpi_cpu_threshold > -1)
377 simgrid::smpi::Colls::set_collectives();
378 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
379 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
380 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
381 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);
382 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
383 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
384 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
385 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
386 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
387 else if (smpi_privatize_option == "mmap")
388 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
389 else if (smpi_privatize_option == "dlopen")
390 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
392 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
394 if (not SMPI_switch_data_segment) {
395 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
396 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
398 #if !HAVE_WORKING_MMAP
399 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
400 XBT_INFO("mmap privatization is broken on this platform, switching to dlopen privatization instead.");
401 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
405 if (smpi_cpu_threshold < 0)
406 smpi_cpu_threshold = DBL_MAX;
408 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
409 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
410 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
411 } else if (val == "local") {
412 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
413 } else if ((val == "no") || (val == "0") || (val == "off")) {
414 smpi_cfg_shared_malloc = SharedMallocType::NONE;
416 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
421 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
422 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
423 typedef void (*smpi_fortran_entry_point_type)();
425 static int smpi_run_entry_point(smpi_entry_point_type entry_point, const std::string& executable_path,
426 std::vector<std::string> args)
428 // copy C strings, we need them writable
429 std::vector<char*>* args4argv = new std::vector<char*>(args.size());
430 std::transform(begin(args), end(args), begin(*args4argv), [](const std::string& s) { return xbt_strdup(s.c_str()); });
432 // set argv[0] to executable_path
433 xbt_free((*args4argv)[0]);
434 (*args4argv)[0] = xbt_strdup(executable_path.c_str());
437 // take a copy of args4argv to keep reference of the allocated strings
438 const std::vector<char*> args2str(*args4argv);
440 int argc = args4argv->size();
441 args4argv->push_back(nullptr);
442 char** argv = args4argv->data();
444 simgrid::smpi::ActorExt::init();
446 for_rtl_init_ (&argc, argv);
451 _gfortran_set_args(argc, argv);
453 int res = entry_point(argc, argv);
458 for (char* s : args2str)
464 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
465 if (smpi_exit_status == 0)
466 smpi_exit_status = res;
472 // TODO, remove the number of functions involved here
473 static smpi_entry_point_type smpi_resolve_function(void* handle)
475 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
476 if (entry_point_fortran != nullptr) {
477 return [entry_point_fortran](int argc, char** argv) {
478 entry_point_fortran();
483 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
484 if (entry_point != nullptr) {
488 return smpi_entry_point_type();
491 static void smpi_copy_file(const std::string& src, const std::string& target, off_t fdin_size)
493 int fdin = open(src.c_str(), O_RDONLY);
494 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
495 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
496 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
498 XBT_DEBUG("Copy %" PRIdMAX " bytes into %s", static_cast<intmax_t>(fdin_size), target.c_str());
500 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
501 if (sent_size == fdin_size) {
505 } else if (sent_size != -1 || errno != ENOSYS) {
506 xbt_die("Error while copying %s: only %zd bytes copied instead of %" PRIdMAX " (errno: %d -- %s)", target.c_str(),
507 sent_size, static_cast<intmax_t>(fdin_size), errno, strerror(errno));
510 // If this point is reached, sendfile() actually is not available. Copy file by hand.
511 const int bufsize = 1024 * 1024 * 4;
513 while (int got = read(fdin, buf, bufsize)) {
515 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
519 while (int done = write(fdout, p, todo)) {
521 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
533 #if not defined(__APPLE__)
534 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
536 char* libname = (char*)(data);
537 const char *path = info->dlpi_name;
538 if(strstr(path, libname)){
539 strncpy(libname, path, 512);
547 static void smpi_init_privatization_dlopen(const std::string& executable)
549 // Prepare the copy of the binary (get its size)
550 struct stat fdin_stat;
551 stat(executable.c_str(), &fdin_stat);
552 off_t fdin_size = fdin_stat.st_size;
554 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
555 if (not libnames.empty()) {
557 std::vector<std::string> privatize_libs;
558 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
560 for (auto const& libname : privatize_libs) {
561 // load the library once to add it to the local libs, to get the absolute path
562 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
563 // get library name from path
564 char fullpath[512] = {'\0'};
565 strncpy(fullpath, libname.c_str(), 511);
566 #if not defined(__APPLE__)
567 int ret = dl_iterate_phdr(visit_libs, fullpath);
569 xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-libs", fullpath);
571 XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
573 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX");
575 privatize_libs_paths.push_back(fullpath);
580 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
581 return std::function<void()>([executable, fdin_size, args] {
582 static std::size_t rank = 0;
583 // Copy the dynamic library:
584 std::string target_executable =
585 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
587 smpi_copy_file(executable, target_executable, fdin_size);
588 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
589 std::vector<std::string> target_libs;
590 for (auto const& libpath : privatize_libs_paths) {
591 // if we were given a full path, strip it
592 size_t index = libpath.find_last_of("/\\");
594 if (index != std::string::npos)
595 libname = libpath.substr(index + 1);
597 if (not libname.empty()) {
598 // load the library to add it to the local libs, to get the absolute path
599 struct stat fdin_stat2;
600 stat(libpath.c_str(), &fdin_stat2);
601 off_t fdin_size2 = fdin_stat2.st_size;
603 // Copy the dynamic library, the new name must be the same length as the old one
604 // just replace the name with 7 digits for the rank and the rest of the name.
605 unsigned int pad = 7;
606 if (libname.length() < pad)
607 pad = libname.length();
608 std::string target_lib =
609 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
610 target_libs.push_back(target_lib);
611 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
612 smpi_copy_file(libpath, target_lib, fdin_size2);
614 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
615 int ret = system(sedcommand.c_str());
617 xbt_die("error while applying sed command %s \n", sedcommand.c_str());
622 // Load the copy and resolve the entry point:
623 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | WANT_RTLD_DEEPBIND);
624 int saved_errno = errno;
625 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
626 unlink(target_executable.c_str());
627 for (const std::string& target_lib : target_libs)
628 unlink(target_lib.c_str());
630 if (handle == nullptr)
631 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
632 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
634 xbt_die("Could not resolve entry point");
635 smpi_run_entry_point(entry_point, executable, args);
640 static void smpi_init_privatization_no_dlopen(const std::string& executable)
642 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
643 smpi_prepare_global_memory_segment();
644 // Load the dynamic library and resolve the entry point:
645 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
646 if (handle == nullptr)
647 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno, strerror(errno));
648 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
650 xbt_die("main not found in %s", executable.c_str());
651 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
652 smpi_backup_global_memory_segment();
654 // Execute the same entry point for each simulated process:
655 simix_global->default_function = [entry_point, executable](std::vector<std::string> args) {
656 return std::function<void()>(
657 [entry_point, executable, args] { smpi_run_entry_point(entry_point, executable, args); });
661 int smpi_main(const char* executable, int argc, char* argv[])
663 srand(SMPI_RAND_SEED);
665 if (getenv("SMPI_PRETEND_CC") != nullptr) {
666 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
667 * configuration tools */
672 SIMIX_global_init(&argc, argv);
674 SMPI_switch_data_segment = &smpi_switch_data_segment;
676 // parse the platform file: get the host list
677 simgrid::s4u::Engine::get_instance()->load_platform(argv[1]);
678 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
681 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
682 smpi_init_privatization_dlopen(executable);
684 smpi_init_privatization_no_dlopen(executable);
687 simgrid::s4u::Engine::get_instance()->load_deployment(argv[2]);
688 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
689 process_data.size()); // This call has a side effect on process_count...
690 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
691 smpi_universe_size = process_count;
694 /* Clean IO before the run */
698 if (MC_is_active()) {
704 xbt_os_walltimer_stop(global_timer);
705 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
706 double global_time = xbt_os_timer_elapsed(global_timer);
707 XBT_INFO("Simulated time: %g seconds. \n\n"
708 "The simulation took %g seconds (after parsing and platform setup)\n"
709 "%g seconds were actual computation of the application",
710 SIMIX_get_clock(), global_time , smpi_total_benched_time);
712 if (smpi_total_benched_time/global_time>=0.75)
713 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
714 "You may want to use sampling functions or trace replay to reduce this.");
717 smpi_global_destroy();
719 return smpi_exit_status;
722 // Called either directly from the user code, or from the code called by smpirun
724 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::ActorPtr actor) {
725 if (not actor->is_daemon()) {
726 process_data.insert({actor, new simgrid::smpi::ActorExt(actor, nullptr)});
729 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::ActorPtr actor) {
730 auto it = process_data.find(actor);
731 if (it != process_data.end()) {
733 process_data.erase(it);
736 simgrid::s4u::Host::on_creation.connect(
737 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
741 smpi_check_options();
744 void SMPI_finalize(){
745 smpi_global_destroy();
748 void smpi_mpi_init() {
749 smpi_init_fortran_types();
750 if(smpi_init_sleep > 0)
751 simcall_process_sleep(smpi_init_sleep);