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 "src/mc/mc_config.hpp"
33 #include <sys/sendfile.h>
40 #if not defined(__APPLE__) && not defined(__HAIKU__)
44 #if defined(__APPLE__)
45 # include <AvailabilityMacros.h>
46 # ifndef MAC_OS_X_VERSION_10_12
47 # define MAC_OS_X_VERSION_10_12 101200
49 constexpr bool HAVE_WORKING_MMAP = (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12);
50 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__sun) || defined(__HAIKU__)
51 constexpr bool HAVE_WORKING_MMAP = false;
53 constexpr bool HAVE_WORKING_MMAP = true;
56 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
59 extern "C" void for_rtl_init_ (int *, char **);
60 extern "C" void for_rtl_finish_ ();
62 extern "C" void __io_set_argc(int);
63 extern "C" void __io_set_argv(char **);
65 extern "C" void _gfortran_set_args(int, char **);
68 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
69 * See https://www.akkadia.org/drepper/dsohowto.pdf
70 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
72 #if !RTLD_DEEPBIND || HAVE_SANITIZER_ADDRESS || HAVE_SANITIZER_THREAD
73 #define WANT_RTLD_DEEPBIND 0
75 #define WANT_RTLD_DEEPBIND RTLD_DEEPBIND
79 std::string papi_default_config_name = "default";
80 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
83 std::unordered_map<std::string, double> location2speedup;
85 static int smpi_exit_status = 0;
86 extern double smpi_total_benched_time;
87 xbt_os_timer_t global_timer;
88 static std::vector<std::string> privatize_libs_paths;
90 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
91 * is important because the implementation of MPI_Comm checks
92 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
94 * This is basically how we only have one global variable but all processes have
95 * different communicators (the one their SMPI instance uses).
97 * See smpi_comm.cpp and the functions therein for details.
99 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
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 me->extension<simgrid::smpi::ActorExt>();
119 simgrid::smpi::ActorExt* smpi_process_remote(simgrid::s4u::ActorPtr actor)
121 if (actor.get() == nullptr)
123 return actor->extension<simgrid::smpi::ActorExt>();
126 MPI_Comm smpi_process_comm_self(){
127 return smpi_process()->comm_self();
130 MPI_Info smpi_process_info_env(){
131 return smpi_process()->info_env();
134 void * smpi_process_get_user_data(){
135 return simgrid::s4u::Actor::self()->get_data();
138 void smpi_process_set_user_data(void *data){
139 simgrid::s4u::Actor::self()->set_data(data);
142 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
144 static void (*saved_callback)(smx_activity_t, void*, size_t);
145 saved_callback = callback;
146 smpi_comm_copy_data_callback = [](simgrid::kernel::activity::CommImpl* comm, void* buff, size_t size) {
147 saved_callback(smx_activity_t(comm), buff, size);
151 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
153 for (auto const& block : private_blocks)
154 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
157 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
158 for (auto const& block : private_blocks)
159 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
162 static void smpi_cleanup_comm_after_copy(simgrid::kernel::activity::CommImpl* comm, void* buff){
163 if (comm->detached()) {
164 // if this is a detached send, the source buffer was duplicated by SMPI
165 // sender to make the original buffer available to the application ASAP
167 //It seems that the request is used after the call there this should be free somewhere else but where???
168 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
169 comm->src_buff_ = nullptr;
173 void smpi_comm_copy_buffer_callback(simgrid::kernel::activity::CommImpl* comm, void* buff, size_t buff_size)
175 size_t src_offset = 0;
176 size_t dst_offset = 0;
177 std::vector<std::pair<size_t, size_t>> src_private_blocks;
178 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
179 XBT_DEBUG("Copy the data over");
180 if(smpi_is_shared(buff, src_private_blocks, &src_offset)) {
181 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
182 if (src_private_blocks.size()==0){//simple shared malloc ... return.
183 XBT_VERB("Sender is shared. Let's ignore it.");
184 smpi_cleanup_comm_after_copy(comm, buff);
189 src_private_blocks.clear();
190 src_private_blocks.push_back(std::make_pair(0, buff_size));
192 if (smpi_is_shared((char*)comm->dst_buff_, dst_private_blocks, &dst_offset)) {
193 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
194 if (dst_private_blocks.size()==0){//simple shared malloc ... return.
195 XBT_VERB("Receiver is shared. Let's ignore it.");
196 smpi_cleanup_comm_after_copy(comm, buff);
201 dst_private_blocks.clear();
202 dst_private_blocks.push_back(std::make_pair(0, buff_size));
204 check_blocks(src_private_blocks, buff_size);
205 check_blocks(dst_private_blocks, buff_size);
206 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
207 check_blocks(private_blocks, buff_size);
209 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
210 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
211 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
212 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
213 smpi_switch_data_segment(comm->src_actor_->iface());
214 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
215 memcpy_private(tmpbuff, buff, private_blocks);
218 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
219 ((char*)comm->dst_buff_ >= smpi_data_exe_start) &&
220 ((char*)comm->dst_buff_ < smpi_data_exe_start + smpi_data_exe_size)) {
221 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
222 smpi_switch_data_segment(comm->dst_actor_->iface());
224 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff, comm->dst_buff_);
225 memcpy_private(comm->dst_buff_, tmpbuff, private_blocks);
227 smpi_cleanup_comm_after_copy(comm,buff);
232 void smpi_comm_null_copy_buffer_callback(simgrid::kernel::activity::CommImpl*, void*, size_t)
234 /* nothing done in this version */
237 static void smpi_check_options()
240 if (MC_is_active()) {
241 if (_sg_mc_buffering == "zero")
242 simgrid::config::set_value<int>("smpi/send-is-detached-thresh", 0);
243 else if (_sg_mc_buffering == "infty")
244 simgrid::config::set_value<int>("smpi/send-is-detached-thresh", INT_MAX);
250 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
251 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"),
252 "smpi/async-small-thresh (=%d) should be smaller or equal to smpi/send-is-detached-thresh (=%d)",
253 simgrid::config::get_value<int>("smpi/async-small-thresh"),
254 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
256 if (simgrid::config::is_default("smpi/host-speed") && not MC_is_active()) {
257 XBT_INFO("You did not set the power of the host running the simulation. "
258 "The timings will certainly not be accurate. "
259 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value. "
261 "https://simgrid.org/doc/latest/Configuring_SimGrid.html#automatic-benchmarking-of-smpi-code for more "
265 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
266 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
267 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
271 return MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED;
274 static void smpi_init_papi()
277 // This map holds for each computation unit (such as "default" or "process1" etc.)
278 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
279 // and the (computed) event_set.
281 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
282 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
283 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
284 " Expected version is %u", PAPI_VER_CURRENT);
286 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
287 boost::char_separator<char> separator_units(";");
288 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
289 Tokenizer tokens(str, separator_units);
291 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
292 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
293 for (auto const& unit_it : tokens) {
294 boost::char_separator<char> separator_events(":");
295 Tokenizer event_tokens(unit_it, separator_events);
297 int event_set = PAPI_NULL;
298 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
299 // TODO: Should this let the whole simulation die?
300 XBT_CRITICAL("Could not create PAPI event set during init.");
303 // NOTE: We cannot use a map here, as we must obey the order of the counters
304 // This is important for PAPI: We need to map the values of counters back
305 // to the event_names (so, when PAPI_read() has finished)!
306 papi_counter_t counters2values;
308 // Iterate over all counters that were specified for this specific
310 // Note that we need to remove the name of the unit
311 // (that could also be the "default" value), which always comes first.
312 // Hence, we start at ++(events.begin())!
313 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
315 int event_code = PAPI_NULL;
316 char* event_name = const_cast<char*>((*events_it).c_str());
317 if (PAPI_event_name_to_code(event_name, &event_code) != PAPI_OK) {
318 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
321 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
322 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
325 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
327 counters2values.push_back(
328 // We cannot just pass *events_it, as this is of type const basic_string
329 std::make_pair<std::string, long long>(std::string(*events_it), 0));
332 std::string unit_name = *(event_tokens.begin());
333 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
335 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
341 static void smpi_init_options(){
342 // return if already called
343 if (smpi_cpu_threshold > -1)
345 simgrid::smpi::colls::set_collectives();
346 simgrid::smpi::colls::smpi_coll_cleanup_callback = nullptr;
347 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
348 if (smpi_cpu_threshold < 0)
349 smpi_cpu_threshold = DBL_MAX;
351 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
352 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
353 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
354 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
355 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
356 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
357 else if (smpi_privatize_option == "mmap")
358 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
359 else if (smpi_privatize_option == "dlopen")
360 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
362 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
364 if (not SMPI_switch_data_segment) {
365 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
366 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
368 if (not HAVE_WORKING_MMAP && smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
369 XBT_INFO("mmap privatization is broken on this platform, switching to dlopen privatization instead.");
370 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
373 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
374 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
375 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
376 } else if (val == "local") {
377 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
378 } else if ((val == "no") || (val == "0") || (val == "off")) {
379 smpi_cfg_shared_malloc = SharedMallocType::NONE;
381 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
386 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
387 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
388 typedef void (*smpi_fortran_entry_point_type)();
390 template <typename F>
391 static int smpi_run_entry_point(const F& entry_point, const std::string& executable_path, std::vector<std::string> args)
393 // copy C strings, we need them writable
394 std::vector<char*>* args4argv = new std::vector<char*>(args.size());
395 std::transform(begin(args), end(args), begin(*args4argv), [](const std::string& s) { return xbt_strdup(s.c_str()); });
397 // set argv[0] to executable_path
398 xbt_free((*args4argv)[0]);
399 (*args4argv)[0] = xbt_strdup(executable_path.c_str());
402 // take a copy of args4argv to keep reference of the allocated strings
403 const std::vector<char*> args2str(*args4argv);
405 int argc = args4argv->size();
406 args4argv->push_back(nullptr);
407 char** argv = args4argv->data();
410 for_rtl_init_ (&argc, argv);
415 _gfortran_set_args(argc, argv);
417 int res = entry_point(argc, argv);
422 for (char* s : args2str)
428 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
429 if (smpi_exit_status == 0)
430 smpi_exit_status = res;
436 // TODO, remove the number of functions involved here
437 static smpi_entry_point_type smpi_resolve_function(void* handle)
439 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
440 if (entry_point_fortran != nullptr) {
441 return [entry_point_fortran](int, char**) {
442 entry_point_fortran();
447 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
448 if (entry_point != nullptr) {
452 return smpi_entry_point_type();
455 static void smpi_copy_file(const std::string& src, const std::string& target, off_t fdin_size)
457 int fdin = open(src.c_str(), O_RDONLY);
458 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
459 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
460 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
462 XBT_DEBUG("Copy %" PRIdMAX " bytes into %s", static_cast<intmax_t>(fdin_size), target.c_str());
464 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
465 if (sent_size == fdin_size) {
469 } else if (sent_size != -1 || errno != ENOSYS) {
470 xbt_die("Error while copying %s: only %zd bytes copied instead of %" PRIdMAX " (errno: %d -- %s)", target.c_str(),
471 sent_size, static_cast<intmax_t>(fdin_size), errno, strerror(errno));
474 // If this point is reached, sendfile() actually is not available. Copy file by hand.
475 const int bufsize = 1024 * 1024 * 4;
476 char* buf = new char[bufsize];
477 while (int got = read(fdin, buf, bufsize)) {
479 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
483 while (int done = write(fdout, p, todo)) {
485 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
498 #if not defined(__APPLE__) && not defined(__HAIKU__)
499 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
501 char* libname = (char*)(data);
502 const char *path = info->dlpi_name;
503 if(strstr(path, libname)){
504 strncpy(libname, path, 512);
512 static void smpi_init_privatization_dlopen(const std::string& executable)
514 // Prepare the copy of the binary (get its size)
515 struct stat fdin_stat;
516 stat(executable.c_str(), &fdin_stat);
517 off_t fdin_size = fdin_stat.st_size;
519 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
520 if (not libnames.empty()) {
522 std::vector<std::string> privatize_libs;
523 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
525 for (auto const& libname : privatize_libs) {
526 // load the library once to add it to the local libs, to get the absolute path
527 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
528 // get library name from path
529 char fullpath[512] = {'\0'};
530 strncpy(fullpath, libname.c_str(), 511);
531 #if not defined(__APPLE__) && not defined(__HAIKU__)
532 xbt_assert(0 != dl_iterate_phdr(visit_libs, fullpath),
533 "Can't find a linked %s - check your settings in smpi/privatize-libs", fullpath);
534 XBT_DEBUG("Extra lib to privatize '%s' found", fullpath);
536 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX nor with Haiku");
538 privatize_libs_paths.push_back(fullpath);
543 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
544 return std::function<void()>([executable, fdin_size, args] {
545 static std::size_t rank = 0;
546 // Copy the dynamic library:
547 std::string target_executable =
548 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
550 smpi_copy_file(executable, target_executable, fdin_size);
551 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
552 std::vector<std::string> target_libs;
553 for (auto const& libpath : privatize_libs_paths) {
554 // if we were given a full path, strip it
555 size_t index = libpath.find_last_of("/\\");
557 if (index != std::string::npos)
558 libname = libpath.substr(index + 1);
560 if (not libname.empty()) {
561 // load the library to add it to the local libs, to get the absolute path
562 struct stat fdin_stat2;
563 stat(libpath.c_str(), &fdin_stat2);
564 off_t fdin_size2 = fdin_stat2.st_size;
566 // Copy the dynamic library, the new name must be the same length as the old one
567 // just replace the name with 7 digits for the rank and the rest of the name.
568 unsigned int pad = 7;
569 if (libname.length() < pad)
570 pad = libname.length();
571 std::string target_lib =
572 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
573 target_libs.push_back(target_lib);
574 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
575 smpi_copy_file(libpath, target_lib, fdin_size2);
577 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
578 xbt_assert(system(sedcommand.c_str()) == 0, "error while applying sed command %s \n", sedcommand.c_str());
583 // Load the copy and resolve the entry point:
584 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | WANT_RTLD_DEEPBIND);
585 int saved_errno = errno;
586 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
587 unlink(target_executable.c_str());
588 for (const std::string& target_lib : target_libs)
589 unlink(target_lib.c_str());
591 xbt_assert(handle != nullptr, "dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno,
592 strerror(saved_errno));
594 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
595 xbt_assert(entry_point, "Could not resolve entry point");
596 smpi_run_entry_point(entry_point, executable, args);
601 static void smpi_init_privatization_no_dlopen(const std::string& executable)
603 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
604 smpi_prepare_global_memory_segment();
606 // Load the dynamic library and resolve the entry point:
607 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
608 xbt_assert(handle != nullptr, "dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno,
610 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
611 xbt_assert(entry_point, "main not found in %s", executable.c_str());
613 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
614 smpi_backup_global_memory_segment();
616 // Execute the same entry point for each simulated process:
617 simix_global->default_function = [entry_point, executable](std::vector<std::string> args) {
618 return std::function<void()>(
619 [entry_point, executable, args] { smpi_run_entry_point(entry_point, executable, args); });
623 int smpi_main(const char* executable, int argc, char* argv[])
625 if (getenv("SMPI_PRETEND_CC") != nullptr) {
626 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
627 * configuration tools */
632 SIMIX_global_init(&argc, argv);
634 auto engine = simgrid::s4u::Engine::get_instance();
635 SMPI_switch_data_segment = &smpi_switch_data_segment;
636 sg_storage_file_system_init();
637 // parse the platform file: get the host list
638 engine->load_platform(argv[1]);
639 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
642 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
643 smpi_init_privatization_dlopen(executable);
645 smpi_init_privatization_no_dlopen(executable);
649 /* This is a ... heavy way to count the MPI ranks */
651 simgrid::s4u::Actor::on_creation.connect([&rank_counts](simgrid::s4u::Actor& actor) {
652 if (not actor.is_daemon())
655 engine->load_deployment(argv[2]);
657 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr, rank_counts);
658 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
660 /* Clean IO before the run */
664 if (MC_is_active()) {
670 xbt_os_walltimer_stop(global_timer);
671 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
672 double global_time = xbt_os_timer_elapsed(global_timer);
673 XBT_INFO("Simulated time: %g seconds. \n\n"
674 "The simulation took %g seconds (after parsing and platform setup)\n"
675 "%g seconds were actual computation of the application",
676 SIMIX_get_clock(), global_time , smpi_total_benched_time);
678 if (smpi_total_benched_time/global_time>=0.75)
679 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
680 "You may want to use sampling functions or trace replay to reduce this.");
685 return smpi_exit_status;
688 // Called either directly from the user code, or from the code called by smpirun
690 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::Actor& actor) {
691 if (not actor.is_daemon())
692 actor.extension_set<simgrid::smpi::ActorExt>(new simgrid::smpi::ActorExt(&actor));
694 simgrid::s4u::Host::on_creation.connect(
695 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
696 for (auto const& host : simgrid::s4u::Engine::get_instance()->get_all_hosts())
697 host->extension_set(new simgrid::smpi::Host(host));
700 if (not MC_is_active()) {
701 global_timer = xbt_os_timer_new();
702 xbt_os_walltimer_start(global_timer);
705 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
706 if (not filename.empty()) {
707 std::ifstream fstream(filename);
708 xbt_assert(fstream.is_open(), "Could not open file %s. Does it exist?", filename.c_str());
711 typedef boost::tokenizer<boost::escaped_list_separator<char>> Tokenizer;
712 std::getline(fstream, line); // Skip the header line
713 while (std::getline(fstream, line)) {
715 Tokenizer::iterator it = tok.begin();
716 Tokenizer::iterator end = std::next(tok.begin());
718 std::string location = *it;
719 boost::trim(location);
720 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
724 smpi_check_options();
729 smpi_bench_destroy();
730 smpi_shared_destroy();
731 smpi_deployment_cleanup_instances();
733 if (simgrid::smpi::colls::smpi_coll_cleanup_callback != nullptr)
734 simgrid::smpi::colls::smpi_coll_cleanup_callback();
736 MPI_COMM_WORLD = MPI_COMM_NULL;
738 if (not MC_is_active()) {
739 xbt_os_timer_free(global_timer);
742 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
743 smpi_destroy_global_memory_segments();
744 if (simgrid::smpi::F2C::lookup() != nullptr)
745 simgrid::smpi::F2C::delete_lookup();
748 void smpi_mpi_init() {
749 smpi_init_fortran_types();
750 if(smpi_init_sleep > 0)
751 simgrid::s4u::this_actor::sleep_for(smpi_init_sleep);