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_init(int*, char***)
134 simgrid::smpi::ActorExt::init();
137 void * smpi_process_get_user_data(){
138 return simgrid::s4u::Actor::self()->get_impl()->get_user_data();
141 void smpi_process_set_user_data(void *data){
142 simgrid::s4u::Actor::self()->get_impl()->set_user_data(data);
145 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
147 static void (*saved_callback)(smx_activity_t, void*, size_t);
148 saved_callback = callback;
149 smpi_comm_copy_data_callback = [](simgrid::kernel::activity::CommImpl* comm, void* buff, size_t size) {
150 saved_callback(smx_activity_t(comm), buff, size);
154 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
156 for (auto const& block : private_blocks)
157 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
160 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
161 for (auto const& block : private_blocks)
162 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
165 void smpi_comm_copy_buffer_callback(simgrid::kernel::activity::CommImpl* comm, void* buff, size_t buff_size)
167 size_t src_offset = 0;
168 size_t dst_offset = 0;
169 std::vector<std::pair<size_t, size_t>> src_private_blocks;
170 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
171 XBT_DEBUG("Copy the data over");
172 if(smpi_is_shared(buff, src_private_blocks, &src_offset)) {
173 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
174 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
177 src_private_blocks.clear();
178 src_private_blocks.push_back(std::make_pair(0, buff_size));
180 if (smpi_is_shared((char*)comm->dst_buff_, dst_private_blocks, &dst_offset)) {
181 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff_);
182 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
185 dst_private_blocks.clear();
186 dst_private_blocks.push_back(std::make_pair(0, buff_size));
188 check_blocks(src_private_blocks, buff_size);
189 check_blocks(dst_private_blocks, buff_size);
190 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
191 check_blocks(private_blocks, buff_size);
193 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
194 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
195 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
196 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
197 smpi_switch_data_segment(comm->src_actor_->iface());
198 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
199 memcpy_private(tmpbuff, buff, private_blocks);
202 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
203 ((char*)comm->dst_buff_ >= smpi_data_exe_start) &&
204 ((char*)comm->dst_buff_ < smpi_data_exe_start + smpi_data_exe_size)) {
205 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
206 smpi_switch_data_segment(comm->dst_actor_->iface());
208 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff, comm->dst_buff_);
209 memcpy_private(comm->dst_buff_, tmpbuff, private_blocks);
211 if (comm->detached()) {
212 // if this is a detached send, the source buffer was duplicated by SMPI
213 // sender to make the original buffer available to the application ASAP
215 //It seems that the request is used after the call there this should be free somewhere else but where???
216 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
217 comm->src_buff_ = nullptr;
223 void smpi_comm_null_copy_buffer_callback(simgrid::kernel::activity::CommImpl*, void*, size_t)
225 /* nothing done in this version */
228 static void smpi_check_options()
230 //check correctness of MPI parameters
232 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
233 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
235 if (simgrid::config::is_default("smpi/host-speed") && not MC_is_active()) {
236 XBT_INFO("You did not set the power of the host running the simulation. "
237 "The timings will certainly not be accurate. "
238 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value. "
240 "https://simgrid.org/doc/latest/Configuring_SimGrid.html#automatic-benchmarking-of-smpi-code for more "
244 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
245 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
246 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
250 return not process_data.empty();
253 void smpi_global_init()
255 if (not MC_is_active()) {
256 global_timer = xbt_os_timer_new();
257 xbt_os_walltimer_start(global_timer);
260 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
261 if (not filename.empty()) {
262 std::ifstream fstream(filename);
263 xbt_assert(fstream.is_open(), "Could not open file %s. Does it exist?", filename.c_str());
266 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
267 std::getline(fstream, line); // Skip the header line
268 while (std::getline(fstream, line)) {
270 Tokenizer::iterator it = tok.begin();
271 Tokenizer::iterator end = std::next(tok.begin());
273 std::string location = *it;
274 boost::trim(location);
275 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
280 // This map holds for each computation unit (such as "default" or "process1" etc.)
281 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
282 // and the (computed) event_set.
284 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
285 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
286 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
287 " Expected version is %u", PAPI_VER_CURRENT);
289 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
290 boost::char_separator<char> separator_units(";");
291 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
292 Tokenizer tokens(str, separator_units);
294 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
295 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
296 for (auto const& unit_it : tokens) {
297 boost::char_separator<char> separator_events(":");
298 Tokenizer event_tokens(unit_it, separator_events);
300 int event_set = PAPI_NULL;
301 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
302 // TODO: Should this let the whole simulation die?
303 XBT_CRITICAL("Could not create PAPI event set during init.");
306 // NOTE: We cannot use a map here, as we must obey the order of the counters
307 // This is important for PAPI: We need to map the values of counters back
308 // to the event_names (so, when PAPI_read() has finished)!
309 papi_counter_t counters2values;
311 // Iterate over all counters that were specified for this specific
313 // Note that we need to remove the name of the unit
314 // (that could also be the "default" value), which always comes first.
315 // Hence, we start at ++(events.begin())!
316 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
318 int event_code = PAPI_NULL;
319 char* event_name = const_cast<char*>((*events_it).c_str());
320 if (PAPI_event_name_to_code(event_name, &event_code) != PAPI_OK) {
321 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
324 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
325 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
328 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
330 counters2values.push_back(
331 // We cannot just pass *events_it, as this is of type const basic_string
332 std::make_pair<std::string, long long>(std::string(*events_it), 0));
335 std::string unit_name = *(event_tokens.begin());
336 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
338 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
344 void smpi_global_destroy()
346 smpi_bench_destroy();
347 smpi_shared_destroy();
348 smpi_deployment_cleanup_instances();
350 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
351 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
353 MPI_COMM_WORLD = MPI_COMM_NULL;
355 if (not MC_is_active()) {
356 xbt_os_timer_free(global_timer);
359 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
360 smpi_destroy_global_memory_segments();
361 if(simgrid::smpi::F2C::lookup() != nullptr)
362 simgrid::smpi::F2C::delete_lookup();
365 static void smpi_init_options(){
366 // return if already called
367 if (smpi_cpu_threshold > -1)
369 simgrid::smpi::Colls::set_collectives();
370 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
371 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
372 if (smpi_cpu_threshold < 0)
373 smpi_cpu_threshold = DBL_MAX;
375 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
376 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
377 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
378 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
379 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
380 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
381 else if (smpi_privatize_option == "mmap")
382 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
383 else if (smpi_privatize_option == "dlopen")
384 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
386 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
388 if (not SMPI_switch_data_segment) {
389 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
390 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
392 if (not HAVE_WORKING_MMAP && smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
393 XBT_INFO("mmap privatization is broken on this platform, switching to dlopen privatization instead.");
394 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
397 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
398 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
399 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
400 } else if (val == "local") {
401 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
402 } else if ((val == "no") || (val == "0") || (val == "off")) {
403 smpi_cfg_shared_malloc = SharedMallocType::NONE;
405 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
410 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
411 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
412 typedef void (*smpi_fortran_entry_point_type)();
414 template <typename F>
415 static int smpi_run_entry_point(const F& entry_point, const std::string& executable_path, std::vector<std::string> args)
417 // copy C strings, we need them writable
418 std::vector<char*>* args4argv = new std::vector<char*>(args.size());
419 std::transform(begin(args), end(args), begin(*args4argv), [](const std::string& s) { return xbt_strdup(s.c_str()); });
421 // set argv[0] to executable_path
422 xbt_free((*args4argv)[0]);
423 (*args4argv)[0] = xbt_strdup(executable_path.c_str());
426 // take a copy of args4argv to keep reference of the allocated strings
427 const std::vector<char*> args2str(*args4argv);
429 int argc = args4argv->size();
430 args4argv->push_back(nullptr);
431 char** argv = args4argv->data();
433 simgrid::smpi::ActorExt::init();
435 for_rtl_init_ (&argc, argv);
440 _gfortran_set_args(argc, argv);
442 int res = entry_point(argc, argv);
447 for (char* s : args2str)
453 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
454 if (smpi_exit_status == 0)
455 smpi_exit_status = res;
461 // TODO, remove the number of functions involved here
462 static smpi_entry_point_type smpi_resolve_function(void* handle)
464 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
465 if (entry_point_fortran != nullptr) {
466 return [entry_point_fortran](int, char**) {
467 entry_point_fortran();
472 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
473 if (entry_point != nullptr) {
477 return smpi_entry_point_type();
480 static void smpi_copy_file(const std::string& src, const std::string& target, off_t fdin_size)
482 int fdin = open(src.c_str(), O_RDONLY);
483 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
484 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
485 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
487 XBT_DEBUG("Copy %" PRIdMAX " bytes into %s", static_cast<intmax_t>(fdin_size), target.c_str());
489 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
490 if (sent_size == fdin_size) {
494 } else if (sent_size != -1 || errno != ENOSYS) {
495 xbt_die("Error while copying %s: only %zd bytes copied instead of %" PRIdMAX " (errno: %d -- %s)", target.c_str(),
496 sent_size, static_cast<intmax_t>(fdin_size), errno, strerror(errno));
499 // If this point is reached, sendfile() actually is not available. Copy file by hand.
500 const int bufsize = 1024 * 1024 * 4;
501 char* buf = new char[bufsize];
502 while (int got = read(fdin, buf, bufsize)) {
504 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
508 while (int done = write(fdout, p, todo)) {
510 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
523 #if not defined(__APPLE__) && not defined(__HAIKU__)
524 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
526 char* libname = (char*)(data);
527 const char *path = info->dlpi_name;
528 if(strstr(path, libname)){
529 strncpy(libname, path, 512);
537 static void smpi_init_privatization_dlopen(const std::string& executable)
539 // Prepare the copy of the binary (get its size)
540 struct stat fdin_stat;
541 stat(executable.c_str(), &fdin_stat);
542 off_t fdin_size = fdin_stat.st_size;
544 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
545 if (not libnames.empty()) {
547 std::vector<std::string> privatize_libs;
548 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
550 for (auto const& libname : privatize_libs) {
551 // load the library once to add it to the local libs, to get the absolute path
552 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
553 // get library name from path
554 char fullpath[512] = {'\0'};
555 strncpy(fullpath, libname.c_str(), 511);
556 #if not defined(__APPLE__) && not defined(__HAIKU__)
557 xbt_assert(0 != dl_iterate_phdr(visit_libs, fullpath),
558 "Can't find a linked %s - check your settings in smpi/privatize-libs", fullpath);
559 XBT_DEBUG("Extra lib to privatize '%s' found", fullpath);
561 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX nor with Haiku");
563 privatize_libs_paths.push_back(fullpath);
568 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
569 return std::function<void()>([executable, fdin_size, args] {
570 static std::size_t rank = 0;
571 // Copy the dynamic library:
572 std::string target_executable =
573 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
575 smpi_copy_file(executable, target_executable, fdin_size);
576 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
577 std::vector<std::string> target_libs;
578 for (auto const& libpath : privatize_libs_paths) {
579 // if we were given a full path, strip it
580 size_t index = libpath.find_last_of("/\\");
582 if (index != std::string::npos)
583 libname = libpath.substr(index + 1);
585 if (not libname.empty()) {
586 // load the library to add it to the local libs, to get the absolute path
587 struct stat fdin_stat2;
588 stat(libpath.c_str(), &fdin_stat2);
589 off_t fdin_size2 = fdin_stat2.st_size;
591 // Copy the dynamic library, the new name must be the same length as the old one
592 // just replace the name with 7 digits for the rank and the rest of the name.
593 unsigned int pad = 7;
594 if (libname.length() < pad)
595 pad = libname.length();
596 std::string target_lib =
597 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
598 target_libs.push_back(target_lib);
599 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
600 smpi_copy_file(libpath, target_lib, fdin_size2);
602 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
603 xbt_assert(system(sedcommand.c_str()) == 0, "error while applying sed command %s \n", sedcommand.c_str());
608 // Load the copy and resolve the entry point:
609 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | WANT_RTLD_DEEPBIND);
610 int saved_errno = errno;
611 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
612 unlink(target_executable.c_str());
613 for (const std::string& target_lib : target_libs)
614 unlink(target_lib.c_str());
616 xbt_assert(handle != nullptr, "dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno,
617 strerror(saved_errno));
619 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
620 xbt_assert(entry_point, "Could not resolve entry point");
621 smpi_run_entry_point(entry_point, executable, args);
626 static void smpi_init_privatization_no_dlopen(const std::string& executable)
628 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
629 smpi_prepare_global_memory_segment();
631 // Load the dynamic library and resolve the entry point:
632 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
633 xbt_assert(handle != nullptr, "dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno,
635 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
636 xbt_assert(entry_point, "main not found in %s", executable.c_str());
638 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
639 smpi_backup_global_memory_segment();
641 // Execute the same entry point for each simulated process:
642 simix_global->default_function = [entry_point, executable](std::vector<std::string> args) {
643 return std::function<void()>(
644 [entry_point, executable, args] { smpi_run_entry_point(entry_point, executable, args); });
648 int smpi_main(const char* executable, int argc, char* argv[])
650 if (getenv("SMPI_PRETEND_CC") != nullptr) {
651 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
652 * configuration tools */
657 SIMIX_global_init(&argc, argv);
659 SMPI_switch_data_segment = &smpi_switch_data_segment;
660 sg_storage_file_system_init();
661 // parse the platform file: get the host list
662 simgrid::s4u::Engine::get_instance()->load_platform(argv[1]);
663 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
666 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
667 smpi_init_privatization_dlopen(executable);
669 smpi_init_privatization_no_dlopen(executable);
672 simgrid::s4u::Engine::get_instance()->load_deployment(argv[2]);
673 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
674 process_data.size()); // This call has a side effect on process_count...
675 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
677 /* Clean IO before the run */
681 if (MC_is_active()) {
687 xbt_os_walltimer_stop(global_timer);
688 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
689 double global_time = xbt_os_timer_elapsed(global_timer);
690 XBT_INFO("Simulated time: %g seconds. \n\n"
691 "The simulation took %g seconds (after parsing and platform setup)\n"
692 "%g seconds were actual computation of the application",
693 SIMIX_get_clock(), global_time , smpi_total_benched_time);
695 if (smpi_total_benched_time/global_time>=0.75)
696 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
697 "You may want to use sampling functions or trace replay to reduce this.");
700 smpi_global_destroy();
702 return smpi_exit_status;
705 // Called either directly from the user code, or from the code called by smpirun
707 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::Actor& actor) {
708 if (not actor.is_daemon()) {
709 process_data.insert({&actor, new simgrid::smpi::ActorExt(&actor)});
712 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::Actor const& actor) {
713 auto it = process_data.find(&actor);
714 if (it != process_data.end()) {
716 process_data.erase(it);
719 simgrid::s4u::Host::on_creation.connect(
720 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
724 smpi_check_options();
727 void SMPI_finalize(){
728 smpi_global_destroy();
731 void smpi_mpi_init() {
732 smpi_init_fortran_types();
733 if(smpi_init_sleep > 0)
734 simcall_process_sleep(smpi_init_sleep);