1 /* Copyright (c) 2007-2017. 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/Mailbox.hpp"
8 #include "simgrid/s4u/Host.hpp"
9 #include "src/msg/msg_private.h"
10 #include "src/simix/smx_private.h"
11 #include "src/surf/surf_interface.hpp"
12 #include "SmpiHost.hpp"
13 #include "xbt/config.hpp"
15 #include "private.hpp"
16 #include "smpi_coll.hpp"
17 #include "smpi_comm.hpp"
18 #include "smpi_group.hpp"
19 #include "smpi_info.hpp"
20 #include "smpi_process.hpp"
22 #include <cfloat> /* DBL_MAX */
29 #include <sys/sendfile.h>
32 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
33 #include <boost/tokenizer.hpp>
34 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
37 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
38 * See https://www.akkadia.org/drepper/dsohowto.pdf
39 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
41 #define RTLD_DEEPBIND 0
46 const char* papi_default_config_name = "default";
48 struct papi_process_data {
49 papi_counter_t counter_data;
54 std::unordered_map<std::string, double> location2speedup;
56 simgrid::smpi::Process **process_data = nullptr;
57 int process_count = 0;
58 int smpi_universe_size = 0;
59 int* index_to_process_data = nullptr;
60 extern double smpi_total_benched_time;
61 xbt_os_timer_t global_timer;
62 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
63 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
64 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
65 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
66 static simgrid::config::Flag<double> smpi_wtime_sleep(
67 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
68 static simgrid::config::Flag<double> smpi_init_sleep(
69 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
71 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
73 int smpi_process_count()
78 simgrid::smpi::Process* smpi_process()
80 smx_actor_t me = SIMIX_process_self();
81 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
83 simgrid::msg::ActorExt* msgExt = static_cast<simgrid::msg::ActorExt*>(me->userdata);
84 return static_cast<simgrid::smpi::Process*>(msgExt->data);
87 simgrid::smpi::Process* smpi_process_remote(int index)
89 return process_data[index_to_process_data[index]];
92 MPI_Comm smpi_process_comm_self(){
93 return smpi_process()->comm_self();
96 void smpi_process_init(int *argc, char ***argv){
97 simgrid::smpi::Process::init(argc, argv);
100 int smpi_process_index(){
101 return smpi_process()->index();
104 void * smpi_process_get_user_data(){
105 return smpi_process()->get_user_data();
108 void smpi_process_set_user_data(void *data){
109 return smpi_process()->set_user_data(data);
113 int smpi_global_size()
115 char *value = getenv("SMPI_GLOBAL_SIZE");
116 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
118 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
121 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
123 smpi_comm_copy_data_callback = callback;
126 static void print(std::vector<std::pair<size_t, size_t>> vec) {
127 std::fprintf(stderr, "{");
128 for (auto elt : vec) {
129 std::fprintf(stderr, "(0x%zx, 0x%zx),", elt.first, elt.second);
131 std::fprintf(stderr, "}\n");
133 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
135 for(auto block : private_blocks) {
136 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
140 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
141 for(auto block : private_blocks) {
142 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
146 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
148 simgrid::kernel::activity::CommImplPtr comm =
149 boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(synchro);
152 size_t src_offset = 0;
153 size_t dst_offset = 0;
154 std::vector<std::pair<size_t, size_t>> src_private_blocks;
155 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
156 XBT_DEBUG("Copy the data over");
157 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
158 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
159 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
162 src_private_blocks.clear();
163 src_private_blocks.push_back(std::make_pair(0, buff_size));
165 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
166 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
167 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
170 dst_private_blocks.clear();
171 dst_private_blocks.push_back(std::make_pair(0, buff_size));
173 check_blocks(src_private_blocks, buff_size);
174 check_blocks(dst_private_blocks, buff_size);
175 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
176 check_blocks(private_blocks, buff_size);
178 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && (static_cast<char*>(buff) >= smpi_start_data_exe)
179 && (static_cast<char*>(buff) < smpi_start_data_exe + smpi_size_data_exe )
181 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
183 smpi_switch_data_segment(
184 static_cast<simgrid::smpi::Process*>((static_cast<simgrid::msg::ActorExt*>(comm->src_proc->userdata)->data))
186 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
187 memcpy_private(tmpbuff, buff, private_blocks);
190 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && ((char*)comm->dst_buff >= smpi_start_data_exe)
191 && ((char*)comm->dst_buff < smpi_start_data_exe + smpi_size_data_exe )){
192 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
193 smpi_switch_data_segment(
194 static_cast<simgrid::smpi::Process*>((static_cast<simgrid::msg::ActorExt*>(comm->dst_proc->userdata)->data))
197 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
198 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
200 if (comm->detached) {
201 // if this is a detached send, the source buffer was duplicated by SMPI
202 // sender to make the original buffer available to the application ASAP
204 //It seems that the request is used after the call there this should be free somewhere else but where???
205 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
206 comm->src_buff = nullptr;
208 if(tmpbuff!=buff)xbt_free(tmpbuff);
212 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
214 /* nothing done in this version */
217 static void smpi_check_options(){
218 //check correctness of MPI parameters
220 xbt_assert(xbt_cfg_get_int("smpi/async-small-thresh") <= xbt_cfg_get_int("smpi/send-is-detached-thresh"));
222 if (xbt_cfg_is_default_value("smpi/host-speed")) {
223 XBT_INFO("You did not set the power of the host running the simulation. "
224 "The timings will certainly not be accurate. "
225 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
226 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
229 xbt_assert(xbt_cfg_get_double("smpi/cpu-threshold") >=0,
230 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
231 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
235 return process_data != nullptr;
238 void smpi_global_init()
242 if (not MC_is_active()) {
243 global_timer = xbt_os_timer_new();
244 xbt_os_walltimer_start(global_timer);
247 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') {
248 std::string filename {xbt_cfg_get_string("smpi/comp-adjustment-file")};
249 std::ifstream fstream(filename);
250 if (not fstream.is_open()) {
251 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
255 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
256 std::getline(fstream, line); // Skip the header line
257 while (std::getline(fstream, line)) {
259 Tokenizer::iterator it = tok.begin();
260 Tokenizer::iterator end = std::next(tok.begin());
262 std::string location = *it;
263 boost::trim(location);
264 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
269 // This map holds for each computation unit (such as "default" or "process1" etc.)
270 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
271 // and the (computed) event_set.
272 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
274 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
275 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
276 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
277 " Expected version is %i",
280 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
281 boost::char_separator<char> separator_units(";");
282 std::string str = std::string(xbt_cfg_get_string("smpi/papi-events"));
283 Tokenizer tokens(str, separator_units);
285 // Iterate over all the computational units. This could be
286 // processes, hosts, threads, ranks... You name it. I'm not exactly
287 // sure what we will support eventually, so I'll leave it at the
288 // general term "units".
289 for (auto& 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 msg_bar_t finalization_barrier = nullptr;
340 if (process_count == 0){
341 process_count = SIMIX_process_count();
343 finalization_barrier = MSG_barrier_init(process_count);
345 smpi_universe_size = process_count;
346 process_data = new simgrid::smpi::Process*[process_count];
347 for (int i = 0; i < process_count; i++) {
348 process_data[i] = new simgrid::smpi::Process(i, finalization_barrier);
350 //if the process was launched through smpirun script we generate a global mpi_comm_world
351 //if not, we let MPI_COMM_NULL, and the comm world will be private to each mpi instance
353 group = new simgrid::smpi::Group(process_count);
354 MPI_COMM_WORLD = new simgrid::smpi::Comm(group, nullptr);
355 MPI_Attr_put(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, reinterpret_cast<void *>(process_count));
357 for (int i = 0; i < process_count; i++)
358 group->set_mapping(i, i);
362 void smpi_global_destroy()
364 int count = smpi_process_count();
366 smpi_bench_destroy();
367 smpi_shared_destroy();
368 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
369 delete MPI_COMM_WORLD->group();
370 MSG_barrier_destroy(process_data[0]->finalization_barrier());
372 smpi_deployment_cleanup_instances();
374 for (int i = 0; i < count; i++) {
375 if(process_data[i]->comm_self()!=MPI_COMM_NULL){
376 simgrid::smpi::Comm::destroy(process_data[i]->comm_self());
378 if(process_data[i]->comm_intra()!=MPI_COMM_NULL){
379 simgrid::smpi::Comm::destroy(process_data[i]->comm_intra());
381 xbt_os_timer_free(process_data[i]->timer());
382 xbt_mutex_destroy(process_data[i]->mailboxes_mutex());
383 delete process_data[i];
385 delete[] process_data;
386 process_data = nullptr;
388 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
389 MPI_COMM_WORLD->cleanup_smp();
390 MPI_COMM_WORLD->cleanup_attr<simgrid::smpi::Comm>();
391 if(simgrid::smpi::Colls::smpi_coll_cleanup_callback!=nullptr)
392 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
393 delete MPI_COMM_WORLD;
396 MPI_COMM_WORLD = MPI_COMM_NULL;
398 if (not MC_is_active()) {
399 xbt_os_timer_free(global_timer);
402 xbt_free(index_to_process_data);
403 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
404 smpi_destroy_global_memory_segments();
410 static void smpi_init_logs(){
412 /* Connect log categories. See xbt/log.c */
414 XBT_LOG_CONNECT(smpi); /* Keep this line as soon as possible in this function: xbt_log_appender_file.c depends on it
415 DO NOT connect this in XBT or so, or it will be useless to xbt_log_appender_file.c */
416 XBT_LOG_CONNECT(instr_smpi);
417 XBT_LOG_CONNECT(smpi_bench);
418 XBT_LOG_CONNECT(smpi_coll);
419 XBT_LOG_CONNECT(smpi_colls);
420 XBT_LOG_CONNECT(smpi_comm);
421 XBT_LOG_CONNECT(smpi_datatype);
422 XBT_LOG_CONNECT(smpi_dvfs);
423 XBT_LOG_CONNECT(smpi_group);
424 XBT_LOG_CONNECT(smpi_host);
425 XBT_LOG_CONNECT(smpi_kernel);
426 XBT_LOG_CONNECT(smpi_mpi);
427 XBT_LOG_CONNECT(smpi_memory);
428 XBT_LOG_CONNECT(smpi_op);
429 XBT_LOG_CONNECT(smpi_pmpi);
430 XBT_LOG_CONNECT(smpi_process);
431 XBT_LOG_CONNECT(smpi_request);
432 XBT_LOG_CONNECT(smpi_replay);
433 XBT_LOG_CONNECT(smpi_rma);
434 XBT_LOG_CONNECT(smpi_shared);
435 XBT_LOG_CONNECT(smpi_utils);
439 static void smpi_init_options(){
440 //return if already called
441 if (smpi_cpu_threshold > -1)
443 simgrid::smpi::Colls::set_collectives();
444 simgrid::smpi::Colls::smpi_coll_cleanup_callback=nullptr;
445 smpi_cpu_threshold = xbt_cfg_get_double("smpi/cpu-threshold");
446 smpi_host_speed = xbt_cfg_get_double("smpi/host-speed");
447 const char* smpi_privatize_option = xbt_cfg_get_string("smpi/privatization");
448 if (std::strcmp(smpi_privatize_option, "no") == 0)
449 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
450 else if (std::strcmp(smpi_privatize_option, "yes") == 0)
451 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
452 else if (std::strcmp(smpi_privatize_option, "mmap") == 0)
453 smpi_privatize_global_variables = SMPI_PRIVATIZE_MMAP;
454 else if (std::strcmp(smpi_privatize_option, "dlopen") == 0)
455 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
457 // Some compatibility stuff:
458 else if (std::strcmp(smpi_privatize_option, "1") == 0)
459 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
460 else if (std::strcmp(smpi_privatize_option, "0") == 0)
461 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
464 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option);
466 #if defined(__FreeBSD__)
467 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) {
468 XBT_INFO("Mixing mmap privatization is broken on FreeBSD, switching to dlopen privatization instead.");
469 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
473 if (smpi_cpu_threshold < 0)
474 smpi_cpu_threshold = DBL_MAX;
476 char* val = xbt_cfg_get_string("smpi/shared-malloc");
477 if (not strcasecmp(val, "yes") || not strcmp(val, "1") || not strcasecmp(val, "on") ||
478 not strcasecmp(val, "global")) {
479 smpi_cfg_shared_malloc = shmalloc_global;
480 } else if (not strcasecmp(val, "local")) {
481 smpi_cfg_shared_malloc = shmalloc_local;
482 } else if (not strcasecmp(val, "no") || not strcmp(val, "0") || not strcasecmp(val, "off")) {
483 smpi_cfg_shared_malloc = shmalloc_none;
485 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
490 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
491 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
492 typedef void (*smpi_fortran_entry_point_type)();
494 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
496 char noarg[] = {'\0'};
497 const int argc = args.size();
498 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
499 for (int i = 0; i != argc; ++i)
500 argv[i] = args[i].empty() ? noarg : &args[i].front();
501 argv[argc] = nullptr;
503 int res = entry_point(argc, argv.get());
505 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
506 smpi_process()->set_return_value(res);
511 // TODO, remove the number of functions involved here
512 static smpi_entry_point_type smpi_resolve_function(void* handle)
514 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
515 if (entry_point_fortran != nullptr) {
516 return [entry_point_fortran](int argc, char** argv) {
517 smpi_process_init(&argc, &argv);
518 entry_point_fortran();
523 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
524 if (entry_point != nullptr) {
528 return smpi_entry_point_type();
531 int smpi_main(const char* executable, int argc, char *argv[])
533 srand(SMPI_RAND_SEED);
535 if (getenv("SMPI_PRETEND_CC") != nullptr) {
536 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
537 * configuration tools */
543 SIMIX_global_init(&argc, argv);
544 MSG_init(&argc,argv);
546 SMPI_switch_data_segment = &smpi_switch_data_segment;
548 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
549 host.extension_set(new simgrid::smpi::SmpiHost(&host));
552 // parse the platform file: get the host list
553 SIMIX_create_environment(argv[1]);
554 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
558 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_DLOPEN) {
560 std::string executable_copy = executable;
562 // Prepare the copy of the binary (get its size)
563 struct stat fdin_stat;
564 stat(executable_copy.c_str(), &fdin_stat);
565 off_t fdin_size = fdin_stat.st_size;
566 static std::size_t rank = 0;
568 simix_global->default_function = [executable_copy, fdin_size](std::vector<std::string> args) {
569 return std::function<void()>([executable_copy, fdin_size, args] {
571 // Copy the dynamic library:
572 std::string target_executable = executable_copy
573 + "_" + std::to_string(getpid())
574 + "_" + std::to_string(rank++) + ".so";
576 int fdin = open(executable_copy.c_str(), O_RDONLY);
577 xbt_assert(fdin >= 0, "Cannot read from %s", executable_copy.c_str());
578 int fdout = open(target_executable.c_str(), O_CREAT | O_RDWR, S_IRWXU);
579 xbt_assert(fdout >= 0, "Cannot write into %s", target_executable.c_str());
582 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
583 xbt_assert(sent_size == fdin_size,
584 "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
585 target_executable.c_str(), sent_size, fdin_size, errno, strerror(errno));
587 XBT_VERB("Copy %d bytes into %s", static_cast<int>(fdin_size), target_executable.c_str());
588 const int bufsize = 1024 * 1024 * 4;
590 while (int got = read(fdin, buf, bufsize)) {
592 xbt_assert(errno == EINTR, "Cannot read from %s", executable_copy.c_str());
596 while (int done = write(fdout, p, todo)) {
598 xbt_assert(errno == EINTR, "Cannot write into %s", target_executable.c_str());
610 // Load the copy and resolve the entry point:
611 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
612 if (xbt_cfg_get_boolean("smpi/keep-temps") == false)
613 unlink(target_executable.c_str());
614 if (handle == nullptr)
615 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), errno, strerror(errno));
616 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
618 xbt_die("Could not resolve entry point");
620 smpi_run_entry_point(entry_point, args);
627 // Load the dynamic library and resolve the entry point:
628 void* handle = dlopen(executable, RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
629 if (handle == nullptr)
630 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable, dlerror(), errno, strerror(errno));
631 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
633 xbt_die("main not found in %s", executable);
634 // TODO, register the executable for SMPI privatization
636 // Execute the same entry point for each simulated process:
637 simix_global->default_function = [entry_point](std::vector<std::string> args) {
638 return std::function<void()>([entry_point, args] {
639 smpi_run_entry_point(entry_point, args);
645 SIMIX_launch_application(argv[2]);
649 /* Clean IO before the run */
653 if (MC_is_active()) {
659 xbt_os_walltimer_stop(global_timer);
660 if (xbt_cfg_get_boolean("smpi/display-timing")){
661 double global_time = xbt_os_timer_elapsed(global_timer);
662 XBT_INFO("Simulated time: %g seconds. \n\n"
663 "The simulation took %g seconds (after parsing and platform setup)\n"
664 "%g seconds were actual computation of the application",
665 SIMIX_get_clock(), global_time , smpi_total_benched_time);
667 if (smpi_total_benched_time/global_time>=0.75)
668 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
669 "You may want to use sampling functions or trace replay to reduce this.");
672 int count = smpi_process_count();
674 for (int i = 0; i < count; i++) {
675 if(process_data[i]->return_value()!=0){
676 ret=process_data[i]->return_value();//return first non 0 value
680 smpi_global_destroy();
687 // Called either directly from the user code, or from the code called by smpirun
692 smpi_check_options();
694 simgrid::surf::surfExitCallbacks.connect(TRACE_smpi_release);
695 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
696 smpi_initialize_global_memory_segments();
699 void SMPI_finalize(){
700 smpi_global_destroy();
703 void smpi_mpi_init() {
704 if(smpi_init_sleep > 0)
705 simcall_process_sleep(smpi_init_sleep);
708 double smpi_mpi_wtime(){
710 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
712 time = SIMIX_get_clock();
713 // to avoid deadlocks if used as a break condition, such as
714 // while (MPI_Wtime(...) < time_limit) {
717 // because the time will not normally advance when only calls to MPI_Wtime
718 // are made -> deadlock (MPI_Wtime never reaches the time limit)
719 if(smpi_wtime_sleep > 0)
720 simcall_process_sleep(smpi_wtime_sleep);
723 time = SIMIX_get_clock();