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 */
22 #include <sys/sendfile.h>
25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
26 #include <boost/tokenizer.hpp>
27 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
30 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
31 * See https://www.akkadia.org/drepper/dsohowto.pdf
32 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
34 #define RTLD_DEEPBIND 0
39 const char* papi_default_config_name = "default";
41 struct papi_process_data {
42 papi_counter_t counter_data;
47 using simgrid::s4u::Actor;
48 using simgrid::s4u::ActorPtr;
49 std::unordered_map<std::string, double> location2speedup;
51 static std::map</*process_id*/ ActorPtr, simgrid::smpi::Process*> process_data;
52 int process_count = 0;
53 static int smpi_exit_status = 0;
54 int smpi_universe_size = 0;
55 extern double smpi_total_benched_time;
56 xbt_os_timer_t global_timer;
57 static char* privatize_lib_path=nullptr;
59 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
60 * is important because the implementation of MPI_Comm checks
61 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
63 * This is basically how we only have one global variable but all processes have
64 * different communicators (the one their SMPI instance uses).
66 * See smpi_comm.cpp and the functions therein for details.
68 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
69 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
70 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
71 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
72 // No instance gets manually created; check also the smpirun.in script as
73 // this default name is used there as well (when the <actor> tag is generated).
74 static const std::string smpi_default_instance_name("smpirun");
75 static simgrid::config::Flag<double> smpi_wtime_sleep(
76 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
77 static simgrid::config::Flag<double> smpi_init_sleep(
78 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
80 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
82 int smpi_process_count()
87 simgrid::smpi::Process* smpi_process()
89 ActorPtr me = Actor::self();
90 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
92 simgrid::msg::ActorExt* msgExt = static_cast<simgrid::msg::ActorExt*>(me->get_impl()->getUserData());
93 return static_cast<simgrid::smpi::Process*>(msgExt->data);
96 simgrid::smpi::Process* smpi_process_remote(ActorPtr actor)
98 return process_data.at(actor);
101 MPI_Comm smpi_process_comm_self(){
102 return smpi_process()->comm_self();
105 void smpi_process_init(int *argc, char ***argv){
106 simgrid::smpi::Process::init(argc, argv);
109 int smpi_process_index(){
110 return simgrid::s4u::this_actor::get_pid();
113 void * smpi_process_get_user_data(){
114 return smpi_process()->get_user_data();
117 void smpi_process_set_user_data(void *data){
118 return smpi_process()->set_user_data(data);
122 int smpi_global_size()
124 char *value = getenv("SMPI_GLOBAL_SIZE");
125 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
127 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
130 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
132 smpi_comm_copy_data_callback = callback;
135 static void print(std::vector<std::pair<size_t, size_t>> vec) {
136 std::fprintf(stderr, "{");
137 for (auto const& elt : vec) {
138 std::fprintf(stderr, "(0x%zx, 0x%zx),", elt.first, elt.second);
140 std::fprintf(stderr, "}\n");
142 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
144 for (auto const& block : private_blocks)
145 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
148 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
149 for (auto const& block : private_blocks)
150 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
153 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
155 simgrid::kernel::activity::CommImplPtr comm =
156 boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(synchro);
159 size_t src_offset = 0;
160 size_t dst_offset = 0;
161 std::vector<std::pair<size_t, size_t>> src_private_blocks;
162 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
163 XBT_DEBUG("Copy the data over");
164 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
165 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
166 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
169 src_private_blocks.clear();
170 src_private_blocks.push_back(std::make_pair(0, buff_size));
172 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
173 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
174 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
177 dst_private_blocks.clear();
178 dst_private_blocks.push_back(std::make_pair(0, buff_size));
180 check_blocks(src_private_blocks, buff_size);
181 check_blocks(dst_private_blocks, buff_size);
182 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
183 check_blocks(private_blocks, buff_size);
185 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
186 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
187 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
188 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
189 smpi_switch_data_segment(comm->src_proc->iface());
190 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
191 memcpy_private(tmpbuff, buff, private_blocks);
194 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) && ((char*)comm->dst_buff >= smpi_data_exe_start) &&
195 ((char*)comm->dst_buff < smpi_data_exe_start + smpi_data_exe_size)) {
196 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
197 smpi_switch_data_segment(comm->dst_proc->iface());
199 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
200 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
202 if (comm->detached) {
203 // if this is a detached send, the source buffer was duplicated by SMPI
204 // sender to make the original buffer available to the application ASAP
206 //It seems that the request is used after the call there this should be free somewhere else but where???
207 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
208 comm->src_buff = nullptr;
214 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
216 /* nothing done in this version */
219 static void smpi_check_options()
221 //check correctness of MPI parameters
223 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
224 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
226 if (simgrid::config::is_default("smpi/host-speed")) {
227 XBT_INFO("You did not set the power of the host running the simulation. "
228 "The timings will certainly not be accurate. "
229 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
230 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
233 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
234 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
235 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
239 return not process_data.empty();
242 void smpi_global_init()
244 if (not MC_is_active()) {
245 global_timer = xbt_os_timer_new();
246 xbt_os_walltimer_start(global_timer);
249 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
250 if (not filename.empty()) {
251 std::ifstream fstream(filename);
252 if (not fstream.is_open()) {
253 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
257 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
258 std::getline(fstream, line); // Skip the header line
259 while (std::getline(fstream, line)) {
261 Tokenizer::iterator it = tok.begin();
262 Tokenizer::iterator end = std::next(tok.begin());
264 std::string location = *it;
265 boost::trim(location);
266 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
271 // This map holds for each computation unit (such as "default" or "process1" etc.)
272 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
273 // and the (computed) event_set.
274 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
276 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
277 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
278 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
279 " Expected version is %i",
282 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
283 boost::char_separator<char> separator_units(";");
284 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
285 Tokenizer tokens(str, separator_units);
287 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
288 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
289 for (auto const& unit_it : tokens) {
290 boost::char_separator<char> separator_events(":");
291 Tokenizer event_tokens(unit_it, separator_events);
293 int event_set = PAPI_NULL;
294 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
295 // TODO: Should this let the whole simulation die?
296 XBT_CRITICAL("Could not create PAPI event set during init.");
299 // NOTE: We cannot use a map here, as we must obey the order of the counters
300 // This is important for PAPI: We need to map the values of counters back
301 // to the event_names (so, when PAPI_read() has finished)!
302 papi_counter_t counters2values;
304 // Iterate over all counters that were specified for this specific
306 // Note that we need to remove the name of the unit
307 // (that could also be the "default" value), which always comes first.
308 // Hence, we start at ++(events.begin())!
309 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
311 int event_code = PAPI_NULL;
312 char* event_name = const_cast<char*>((*events_it).c_str());
313 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
314 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
315 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
318 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
321 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", 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();
359 static void smpi_init_options(){
360 // return if already called
361 if (smpi_cpu_threshold > -1)
363 simgrid::smpi::Colls::set_collectives();
364 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
365 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
366 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
367 xbt_assert(smpi_host_speed >= 0, "You're trying to set the host_speed to a negative value (%f)", smpi_host_speed);
368 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
369 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
370 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
371 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
372 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
373 else if (smpi_privatize_option == "mmap")
374 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
375 else if (smpi_privatize_option == "dlopen")
376 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
378 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
380 if (not SMPI_switch_data_segment) {
381 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
382 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
384 #if defined(__FreeBSD__)
385 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
386 XBT_INFO("mmap privatization is broken on FreeBSD, switching to dlopen privatization instead.");
387 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
391 if (smpi_cpu_threshold < 0)
392 smpi_cpu_threshold = DBL_MAX;
394 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
395 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
396 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
397 } else if (val == "local") {
398 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
399 } else if ((val == "no") || (val == "0") || (val == "off")) {
400 smpi_cfg_shared_malloc = SharedMallocType::NONE;
402 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
407 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
408 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
409 typedef void (*smpi_fortran_entry_point_type)();
411 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
413 char noarg[] = {'\0'};
414 const int argc = args.size();
415 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
416 for (int i = 0; i != argc; ++i)
417 argv[i] = args[i].empty() ? noarg : &args[i].front();
418 argv[argc] = nullptr;
420 int res = entry_point(argc, argv.get());
422 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
423 if (smpi_exit_status == 0)
424 smpi_exit_status = res;
430 // TODO, remove the number of functions involved here
431 static smpi_entry_point_type smpi_resolve_function(void* handle)
433 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
434 if (entry_point_fortran != nullptr) {
435 return [entry_point_fortran](int argc, char** argv) {
436 smpi_process_init(&argc, &argv);
437 entry_point_fortran();
442 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
443 if (entry_point != nullptr) {
447 return smpi_entry_point_type();
450 static void smpi_copy_file(std::string src,std::string target, off_t fdin_size, int rank){
452 int fdin = open(src.c_str(), O_RDONLY);
453 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.",
455 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
456 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
458 XBT_DEBUG("Copy %ld bytes into %s", static_cast<long>(fdin_size), target.c_str());
460 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
461 xbt_assert(sent_size == fdin_size,
462 "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 static int visit_libs (struct dl_phdr_info *info,
489 size_t size, void *data){
490 char* libname = (char*)(data);
491 const char *path = info->dlpi_name;
492 if(strstr(path, libname)){
493 strncpy(libname, path, 512);
500 int smpi_main(const char* executable, int argc, char *argv[])
502 srand(SMPI_RAND_SEED);
504 if (getenv("SMPI_PRETEND_CC") != nullptr) {
505 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
506 * configuration tools */
512 SIMIX_global_init(&argc, argv);
513 MSG_init(&argc,argv);
515 SMPI_switch_data_segment = &smpi_switch_data_segment;
517 // TODO This will not be executed in the case where smpi_main is not called,
518 // e.g., not for smpi_msg_masterslave. This should be moved to another location
519 // that is always called -- maybe close to Actor::onCreation?
520 simgrid::s4u::Host::on_creation.connect(
521 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
523 // parse the platform file: get the host list
524 SIMIX_create_environment(argv[1]);
525 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
528 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN) {
530 std::string executable_copy = executable;
532 // Prepare the copy of the binary (get its size)
533 struct stat fdin_stat;
534 stat(executable_copy.c_str(), &fdin_stat);
535 off_t fdin_size = fdin_stat.st_size;
536 static std::size_t rank = 0;
539 std::string libname = simgrid::config::get_value<std::string>("smpi/privatize-lib");
540 std::string target_lib;
541 if(not libname.empty()){
542 //load the library once to add it to the local libs, to get the absolute path
543 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
544 //get library name from path
545 char fullpath[512]={'\0'};
546 strcpy(fullpath, libname.c_str());
547 int ret = dl_iterate_phdr(visit_libs, fullpath);
549 xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-lib", fullpath);
551 XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
552 privatize_lib_path=strdup(fullpath);
556 simix_global->default_function = [executable_copy, fdin_size](std::vector<std::string> args) {
557 return std::function<void()>([executable_copy, fdin_size, args] {
559 // Copy the dynamic library:
560 std::string target_executable = executable_copy
561 + "_" + std::to_string(getpid())
562 + "_" + std::to_string(rank) + ".so";
564 smpi_copy_file(executable_copy, target_executable, fdin_size, rank);
566 //if smpi/privatize-lib is set, duplicate pointed lib and link each executable to a different one.
567 //TODO : extend to multiple libs
568 std::string libname = simgrid::config::get_value<std::string>("smpi/privatize-lib");
569 //if we were given a full path, strip it
570 size_t index = libname.find_last_of("/\\");
571 if(index!=std::string::npos)
572 libname=libname.substr(index+1);
573 std::string target_lib;
574 if(not libname.empty()){
575 //load the library to add it to the local libs, to get the absolute path
576 struct stat fdin_stat2;
577 stat(privatize_lib_path, &fdin_stat2);
578 off_t fdin_size2 = fdin_stat2.st_size;
580 // Copy the dynamic library, the new name must be the same length as the old one
581 // just replace the name with 0s and the rank.
582 target_lib = std::string(libname.length() - std::to_string(rank).length(), '0')+std::to_string(rank);
583 XBT_DEBUG("copy lib %s to %s, with size %zd", privatize_lib_path, target_lib.c_str(), fdin_size2);
584 smpi_copy_file(privatize_lib_path, target_lib, fdin_size2, rank);
586 std::string sedcommand = "sed -i -e 's/"+libname+"/"+target_lib+"/g' "+target_executable;
587 int ret = system(sedcommand.c_str());
588 if(ret!=0) xbt_die ("error while applying sed command %s \n", sedcommand.c_str());
591 // Load the copy and resolve the entry point:
592 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
593 int saved_errno = errno;
594 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false){
595 unlink(target_executable.c_str());
596 if(not target_lib.empty())
597 unlink(target_lib.c_str());
599 if (handle == nullptr)
600 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
601 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
603 xbt_die("Could not resolve entry point");
604 smpi_run_entry_point(entry_point, args);
609 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
610 smpi_prepare_global_memory_segment();
611 // Load the dynamic library and resolve the entry point:
612 void* handle = dlopen(executable, RTLD_LAZY | RTLD_LOCAL);
613 if (handle == nullptr)
614 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable, dlerror(), errno, strerror(errno));
615 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
617 xbt_die("main not found in %s", executable);
618 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
619 smpi_backup_global_memory_segment();
621 // Execute the same entry point for each simulated process:
622 simix_global->default_function = [entry_point](std::vector<std::string> args) {
623 return std::function<void()>([entry_point, args] {
624 smpi_run_entry_point(entry_point, args);
630 SIMIX_launch_application(argv[2]);
631 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
632 process_data.size()); // This call has a side effect on process_count...
633 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
634 smpi_universe_size = process_count;
637 /* Clean IO before the run */
641 if (MC_is_active()) {
647 xbt_os_walltimer_stop(global_timer);
648 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
649 double global_time = xbt_os_timer_elapsed(global_timer);
650 XBT_INFO("Simulated time: %g seconds. \n\n"
651 "The simulation took %g seconds (after parsing and platform setup)\n"
652 "%g seconds were actual computation of the application",
653 SIMIX_get_clock(), global_time , smpi_total_benched_time);
655 if (smpi_total_benched_time/global_time>=0.75)
656 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
657 "You may want to use sampling functions or trace replay to reduce this.");
660 smpi_global_destroy();
662 return smpi_exit_status;
665 // Called either directly from the user code, or from the code called by smpirun
667 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::ActorPtr actor) {
668 if (not actor->is_daemon()) {
669 process_data.insert({actor, new simgrid::smpi::Process(actor, nullptr)});
672 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::ActorPtr actor) {
673 auto it = process_data.find(actor);
674 if (it != process_data.end()) {
676 process_data.erase(it);
682 smpi_check_options();
683 simgrid::s4u::on_simulation_end.connect(TRACE_smpi_release);
686 void SMPI_finalize(){
687 smpi_global_destroy();
690 void smpi_mpi_init() {
691 if(smpi_init_sleep > 0)
692 simcall_process_sleep(smpi_init_sleep);
695 double smpi_mpi_wtime(){
697 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
699 time = SIMIX_get_clock();
700 // to avoid deadlocks if used as a break condition, such as
701 // while (MPI_Wtime(...) < time_limit) {
704 // because the time will not normally advance when only calls to MPI_Wtime
705 // are made -> deadlock (MPI_Wtime never reaches the time limit)
706 if(smpi_wtime_sleep > 0)
707 simcall_process_sleep(smpi_wtime_sleep);
710 time = SIMIX_get_clock();