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 constexpr bool HAVE_WORKING_MMAP = (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12);
34 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
35 constexpr bool HAVE_WORKING_MMAP = false;
37 constexpr bool HAVE_WORKING_MMAP = true;
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 std::unordered_map<std::string, double> location2speedup;
76 static std::map</*process_id*/ simgrid::s4u::ActorPtr, simgrid::smpi::ActorExt*> process_data;
77 int process_count = 0;
78 static int smpi_exit_status = 0;
79 int smpi_universe_size = 0;
80 extern double smpi_total_benched_time;
81 xbt_os_timer_t global_timer;
82 static std::vector<std::string> privatize_libs_paths;
84 * Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
85 * is important because the implementation of MPI_Comm checks
86 * "this == MPI_COMM_UNINITIALIZED"? If yes, it uses smpi_process()->comm_world()
88 * This is basically how we only have one global variable but all processes have
89 * different communicators (the one their SMPI instance uses).
91 * See smpi_comm.cpp and the functions therein for details.
93 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
94 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
95 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
96 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
97 // No instance gets manually created; check also the smpirun.in script as
98 // this default name is used there as well (when the <actor> tag is generated).
99 static const std::string smpi_default_instance_name("smpirun");
100 static simgrid::config::Flag<double> smpi_init_sleep(
101 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
103 void (*smpi_comm_copy_data_callback)(simgrid::kernel::activity::CommImpl*, void*,
104 size_t) = &smpi_comm_copy_buffer_callback;
106 int smpi_process_count()
108 return process_count;
111 simgrid::smpi::ActorExt* smpi_process()
113 simgrid::s4u::ActorPtr me = simgrid::s4u::Actor::self();
115 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
118 return process_data.at(me);
121 simgrid::smpi::ActorExt* smpi_process_remote(simgrid::s4u::ActorPtr actor)
123 return process_data.at(actor);
126 MPI_Comm smpi_process_comm_self(){
127 return smpi_process()->comm_self();
130 void smpi_process_init(int *argc, char ***argv){
131 simgrid::smpi::ActorExt::init();
134 void * smpi_process_get_user_data(){
135 return simgrid::s4u::Actor::self()->get_impl()->get_user_data();
138 void smpi_process_set_user_data(void *data){
139 simgrid::s4u::Actor::self()->get_impl()->set_user_data(data);
143 int smpi_global_size()
145 char *value = getenv("SMPI_GLOBAL_SIZE");
146 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
148 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
151 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
153 static void (*saved_callback)(smx_activity_t, void*, size_t);
154 saved_callback = callback;
155 smpi_comm_copy_data_callback = [](simgrid::kernel::activity::CommImpl* comm, void* buff, size_t size) {
156 saved_callback(smx_activity_t(comm), buff, size);
160 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
162 for (auto const& block : private_blocks)
163 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
166 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
167 for (auto const& block : private_blocks)
168 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
171 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((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
181 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
182 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
185 src_private_blocks.clear();
186 src_private_blocks.push_back(std::make_pair(0, buff_size));
188 if ((dst_shared = smpi_is_shared((char*)comm->dst_buff_, dst_private_blocks, &dst_offset))) {
189 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff_);
190 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
193 dst_private_blocks.clear();
194 dst_private_blocks.push_back(std::make_pair(0, buff_size));
196 check_blocks(src_private_blocks, buff_size);
197 check_blocks(dst_private_blocks, buff_size);
198 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
199 check_blocks(private_blocks, buff_size);
201 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
202 (static_cast<char*>(buff) >= smpi_data_exe_start) &&
203 (static_cast<char*>(buff) < smpi_data_exe_start + smpi_data_exe_size)) {
204 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
205 smpi_switch_data_segment(comm->src_actor_->iface());
206 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
207 memcpy_private(tmpbuff, buff, private_blocks);
210 if ((smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) &&
211 ((char*)comm->dst_buff_ >= smpi_data_exe_start) &&
212 ((char*)comm->dst_buff_ < smpi_data_exe_start + smpi_data_exe_size)) {
213 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
214 smpi_switch_data_segment(comm->dst_actor_->iface());
216 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff, comm->dst_buff_);
217 memcpy_private(comm->dst_buff_, tmpbuff, private_blocks);
219 if (comm->detached) {
220 // if this is a detached send, the source buffer was duplicated by SMPI
221 // sender to make the original buffer available to the application ASAP
223 //It seems that the request is used after the call there this should be free somewhere else but where???
224 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
225 comm->src_buff_ = nullptr;
231 void smpi_comm_null_copy_buffer_callback(simgrid::kernel::activity::CommImpl*, void*, size_t)
233 /* nothing done in this version */
236 static void smpi_check_options()
238 //check correctness of MPI parameters
240 xbt_assert(simgrid::config::get_value<int>("smpi/async-small-thresh") <=
241 simgrid::config::get_value<int>("smpi/send-is-detached-thresh"));
243 if (simgrid::config::is_default("smpi/host-speed")) {
244 XBT_INFO("You did not set the power of the host running the simulation. "
245 "The timings will certainly not be accurate. "
246 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
247 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
250 xbt_assert(simgrid::config::get_value<double>("smpi/cpu-threshold") >= 0,
251 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
252 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
256 return not process_data.empty();
259 void smpi_global_init()
261 if (not MC_is_active()) {
262 global_timer = xbt_os_timer_new();
263 xbt_os_walltimer_start(global_timer);
266 std::string filename = simgrid::config::get_value<std::string>("smpi/comp-adjustment-file");
267 if (not filename.empty()) {
268 std::ifstream fstream(filename);
269 if (not fstream.is_open()) {
270 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
274 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
275 std::getline(fstream, line); // Skip the header line
276 while (std::getline(fstream, line)) {
278 Tokenizer::iterator it = tok.begin();
279 Tokenizer::iterator end = std::next(tok.begin());
281 std::string location = *it;
282 boost::trim(location);
283 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
288 // This map holds for each computation unit (such as "default" or "process1" etc.)
289 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
290 // and the (computed) event_set.
292 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
293 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
294 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
295 " Expected version is %u", PAPI_VER_CURRENT);
297 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
298 boost::char_separator<char> separator_units(";");
299 std::string str = simgrid::config::get_value<std::string>("smpi/papi-events");
300 Tokenizer tokens(str, separator_units);
302 // Iterate over all the computational units. This could be processes, hosts, threads, ranks... You name it.
303 // I'm not exactly sure what we will support eventually, so I'll leave it at the general term "units".
304 for (auto const& unit_it : tokens) {
305 boost::char_separator<char> separator_events(":");
306 Tokenizer event_tokens(unit_it, separator_events);
308 int event_set = PAPI_NULL;
309 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
310 // TODO: Should this let the whole simulation die?
311 XBT_CRITICAL("Could not create PAPI event set during init.");
314 // NOTE: We cannot use a map here, as we must obey the order of the counters
315 // This is important for PAPI: We need to map the values of counters back
316 // to the event_names (so, when PAPI_read() has finished)!
317 papi_counter_t counters2values;
319 // Iterate over all counters that were specified for this specific
321 // Note that we need to remove the name of the unit
322 // (that could also be the "default" value), which always comes first.
323 // Hence, we start at ++(events.begin())!
324 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); ++events_it) {
326 int event_code = PAPI_NULL;
327 char* event_name = const_cast<char*>((*events_it).c_str());
328 if (PAPI_event_name_to_code(event_name, &event_code) != PAPI_OK) {
329 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
332 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
333 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
336 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
338 counters2values.push_back(
339 // We cannot just pass *events_it, as this is of type const basic_string
340 std::make_pair<std::string, long long>(std::string(*events_it), 0));
343 std::string unit_name = *(event_tokens.begin());
344 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
346 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
352 void smpi_global_destroy()
354 smpi_bench_destroy();
355 smpi_shared_destroy();
356 smpi_deployment_cleanup_instances();
358 if (simgrid::smpi::Colls::smpi_coll_cleanup_callback != nullptr)
359 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
361 MPI_COMM_WORLD = MPI_COMM_NULL;
363 if (not MC_is_active()) {
364 xbt_os_timer_free(global_timer);
367 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
368 smpi_destroy_global_memory_segments();
370 if(simgrid::smpi::F2C::lookup() != nullptr)
371 simgrid::smpi::F2C::delete_lookup();
374 static void smpi_init_options(){
375 // return if already called
376 if (smpi_cpu_threshold > -1)
378 simgrid::smpi::Colls::set_collectives();
379 simgrid::smpi::Colls::smpi_coll_cleanup_callback = nullptr;
380 smpi_cpu_threshold = simgrid::config::get_value<double>("smpi/cpu-threshold");
381 smpi_host_speed = simgrid::config::get_value<double>("smpi/host-speed");
382 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);
383 std::string smpi_privatize_option = simgrid::config::get_value<std::string>("smpi/privatization");
384 if (smpi_privatize_option == "no" || smpi_privatize_option == "0")
385 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
386 else if (smpi_privatize_option == "yes" || smpi_privatize_option == "1")
387 smpi_privatize_global_variables = SmpiPrivStrategies::DEFAULT;
388 else if (smpi_privatize_option == "mmap")
389 smpi_privatize_global_variables = SmpiPrivStrategies::MMAP;
390 else if (smpi_privatize_option == "dlopen")
391 smpi_privatize_global_variables = SmpiPrivStrategies::DLOPEN;
393 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option.c_str());
395 if (not SMPI_switch_data_segment) {
396 XBT_DEBUG("Running without smpi_main(); disable smpi/privatization.");
397 smpi_privatize_global_variables = SmpiPrivStrategies::NONE;
399 if (not HAVE_WORKING_MMAP && 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;
404 if (smpi_cpu_threshold < 0)
405 smpi_cpu_threshold = DBL_MAX;
407 std::string val = simgrid::config::get_value<std::string>("smpi/shared-malloc");
408 if ((val == "yes") || (val == "1") || (val == "on") || (val == "global")) {
409 smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
410 } else if (val == "local") {
411 smpi_cfg_shared_malloc = SharedMallocType::LOCAL;
412 } else if ((val == "no") || (val == "0") || (val == "off")) {
413 smpi_cfg_shared_malloc = SharedMallocType::NONE;
415 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
420 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
421 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
422 typedef void (*smpi_fortran_entry_point_type)();
424 static int smpi_run_entry_point(const smpi_entry_point_type& entry_point, const std::string& executable_path,
425 std::vector<std::string> args)
427 // copy C strings, we need them writable
428 std::vector<char*>* args4argv = new std::vector<char*>(args.size());
429 std::transform(begin(args), end(args), begin(*args4argv), [](const std::string& s) { return xbt_strdup(s.c_str()); });
431 // set argv[0] to executable_path
432 xbt_free((*args4argv)[0]);
433 (*args4argv)[0] = xbt_strdup(executable_path.c_str());
436 // take a copy of args4argv to keep reference of the allocated strings
437 const std::vector<char*> args2str(*args4argv);
439 int argc = args4argv->size();
440 args4argv->push_back(nullptr);
441 char** argv = args4argv->data();
443 simgrid::smpi::ActorExt::init();
445 for_rtl_init_ (&argc, argv);
450 _gfortran_set_args(argc, argv);
452 int res = entry_point(argc, argv);
457 for (char* s : args2str)
463 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
464 if (smpi_exit_status == 0)
465 smpi_exit_status = res;
471 // TODO, remove the number of functions involved here
472 static smpi_entry_point_type smpi_resolve_function(void* handle)
474 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
475 if (entry_point_fortran != nullptr) {
476 return [entry_point_fortran](int argc, char** argv) {
477 entry_point_fortran();
482 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
483 if (entry_point != nullptr) {
487 return smpi_entry_point_type();
490 static void smpi_copy_file(const std::string& src, const std::string& target, off_t fdin_size)
492 int fdin = open(src.c_str(), O_RDONLY);
493 xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
494 int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
495 xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
497 XBT_DEBUG("Copy %" PRIdMAX " bytes into %s", static_cast<intmax_t>(fdin_size), target.c_str());
499 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
500 if (sent_size == fdin_size) {
504 } else if (sent_size != -1 || errno != ENOSYS) {
505 xbt_die("Error while copying %s: only %zd bytes copied instead of %" PRIdMAX " (errno: %d -- %s)", target.c_str(),
506 sent_size, static_cast<intmax_t>(fdin_size), errno, strerror(errno));
509 // If this point is reached, sendfile() actually is not available. Copy file by hand.
510 const int bufsize = 1024 * 1024 * 4;
512 while (int got = read(fdin, buf, bufsize)) {
514 xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
518 while (int done = write(fdout, p, todo)) {
520 xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
532 #if not defined(__APPLE__)
533 static int visit_libs(struct dl_phdr_info* info, size_t, void* data)
535 char* libname = (char*)(data);
536 const char *path = info->dlpi_name;
537 if(strstr(path, libname)){
538 strncpy(libname, path, 512);
546 static void smpi_init_privatization_dlopen(const std::string& executable)
548 // Prepare the copy of the binary (get its size)
549 struct stat fdin_stat;
550 stat(executable.c_str(), &fdin_stat);
551 off_t fdin_size = fdin_stat.st_size;
553 std::string libnames = simgrid::config::get_value<std::string>("smpi/privatize-libs");
554 if (not libnames.empty()) {
556 std::vector<std::string> privatize_libs;
557 boost::split(privatize_libs, libnames, boost::is_any_of(";"));
559 for (auto const& libname : privatize_libs) {
560 // load the library once to add it to the local libs, to get the absolute path
561 void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
562 // get library name from path
563 char fullpath[512] = {'\0'};
564 strncpy(fullpath, libname.c_str(), 511);
565 #if not defined(__APPLE__)
566 int ret = dl_iterate_phdr(visit_libs, fullpath);
568 xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-libs", fullpath);
570 XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
572 xbt_die("smpi/privatize-libs is not (yet) compatible with OSX");
574 privatize_libs_paths.push_back(fullpath);
579 simix_global->default_function = [executable, fdin_size](std::vector<std::string> args) {
580 return std::function<void()>([executable, fdin_size, args] {
581 static std::size_t rank = 0;
582 // Copy the dynamic library:
583 std::string target_executable =
584 executable + "_" + std::to_string(getpid()) + "_" + std::to_string(rank) + ".so";
586 smpi_copy_file(executable, target_executable, fdin_size);
587 // if smpi/privatize-libs is set, duplicate pointed lib and link each executable copy to a different one.
588 std::vector<std::string> target_libs;
589 for (auto const& libpath : privatize_libs_paths) {
590 // if we were given a full path, strip it
591 size_t index = libpath.find_last_of("/\\");
593 if (index != std::string::npos)
594 libname = libpath.substr(index + 1);
596 if (not libname.empty()) {
597 // load the library to add it to the local libs, to get the absolute path
598 struct stat fdin_stat2;
599 stat(libpath.c_str(), &fdin_stat2);
600 off_t fdin_size2 = fdin_stat2.st_size;
602 // Copy the dynamic library, the new name must be the same length as the old one
603 // just replace the name with 7 digits for the rank and the rest of the name.
604 unsigned int pad = 7;
605 if (libname.length() < pad)
606 pad = libname.length();
607 std::string target_lib =
608 std::string(pad - std::to_string(rank).length(), '0') + std::to_string(rank) + libname.substr(pad);
609 target_libs.push_back(target_lib);
610 XBT_DEBUG("copy lib %s to %s, with size %lld", libpath.c_str(), target_lib.c_str(), (long long)fdin_size2);
611 smpi_copy_file(libpath, target_lib, fdin_size2);
613 std::string sedcommand = "sed -i -e 's/" + libname + "/" + target_lib + "/g' " + target_executable;
614 int ret = system(sedcommand.c_str());
616 xbt_die("error while applying sed command %s \n", sedcommand.c_str());
621 // Load the copy and resolve the entry point:
622 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | WANT_RTLD_DEEPBIND);
623 int saved_errno = errno;
624 if (simgrid::config::get_value<bool>("smpi/keep-temps") == false) {
625 unlink(target_executable.c_str());
626 for (const std::string& target_lib : target_libs)
627 unlink(target_lib.c_str());
629 if (handle == nullptr)
630 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
631 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
633 xbt_die("Could not resolve entry point");
634 smpi_run_entry_point(entry_point, executable, args);
639 static void smpi_init_privatization_no_dlopen(const std::string& executable)
641 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
642 smpi_prepare_global_memory_segment();
643 // Load the dynamic library and resolve the entry point:
644 void* handle = dlopen(executable.c_str(), RTLD_LAZY | RTLD_LOCAL);
645 if (handle == nullptr)
646 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable.c_str(), dlerror(), errno, strerror(errno));
647 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
649 xbt_die("main not found in %s", executable.c_str());
650 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP)
651 smpi_backup_global_memory_segment();
653 // Execute the same entry point for each simulated process:
654 simix_global->default_function = [entry_point, executable](std::vector<std::string> args) {
655 return std::function<void()>(
656 [entry_point, executable, args] { smpi_run_entry_point(entry_point, executable, args); });
660 int smpi_main(const char* executable, int argc, char* argv[])
662 if (getenv("SMPI_PRETEND_CC") != nullptr) {
663 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
664 * configuration tools */
669 SIMIX_global_init(&argc, argv);
671 SMPI_switch_data_segment = &smpi_switch_data_segment;
673 // parse the platform file: get the host list
674 simgrid::s4u::Engine::get_instance()->load_platform(argv[1]);
675 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
678 if (smpi_privatize_global_variables == SmpiPrivStrategies::DLOPEN)
679 smpi_init_privatization_dlopen(executable);
681 smpi_init_privatization_no_dlopen(executable);
684 simgrid::s4u::Engine::get_instance()->load_deployment(argv[2]);
685 SMPI_app_instance_register(smpi_default_instance_name.c_str(), nullptr,
686 process_data.size()); // This call has a side effect on process_count...
687 MPI_COMM_WORLD = *smpi_deployment_comm_world(smpi_default_instance_name);
688 smpi_universe_size = process_count;
691 /* Clean IO before the run */
695 if (MC_is_active()) {
701 xbt_os_walltimer_stop(global_timer);
702 if (simgrid::config::get_value<bool>("smpi/display-timing")) {
703 double global_time = xbt_os_timer_elapsed(global_timer);
704 XBT_INFO("Simulated time: %g seconds. \n\n"
705 "The simulation took %g seconds (after parsing and platform setup)\n"
706 "%g seconds were actual computation of the application",
707 SIMIX_get_clock(), global_time , smpi_total_benched_time);
709 if (smpi_total_benched_time/global_time>=0.75)
710 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
711 "You may want to use sampling functions or trace replay to reduce this.");
714 smpi_global_destroy();
716 return smpi_exit_status;
719 // Called either directly from the user code, or from the code called by smpirun
721 simgrid::s4u::Actor::on_creation.connect([](simgrid::s4u::ActorPtr actor) {
722 if (not actor->is_daemon()) {
723 process_data.insert({actor, new simgrid::smpi::ActorExt(actor, nullptr)});
726 simgrid::s4u::Actor::on_destruction.connect([](simgrid::s4u::ActorPtr actor) {
727 auto it = process_data.find(actor);
728 if (it != process_data.end()) {
730 process_data.erase(it);
733 simgrid::s4u::Host::on_creation.connect(
734 [](simgrid::s4u::Host& host) { host.extension_set(new simgrid::smpi::Host(&host)); });
738 smpi_check_options();
741 void SMPI_finalize(){
742 smpi_global_destroy();
745 void smpi_mpi_init() {
746 smpi_init_fortran_types();
747 if(smpi_init_sleep > 0)
748 simcall_process_sleep(smpi_init_sleep);