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 "src/smpi/SmpiHost.hpp"
13 #include "xbt/config.hpp"
14 #include "src/smpi/private.h"
15 #include "src/smpi/smpi_coll.hpp"
16 #include "src/smpi/smpi_comm.hpp"
17 #include "src/smpi/smpi_group.hpp"
18 #include "src/smpi/smpi_info.hpp"
19 #include "src/smpi/smpi_process.hpp"
24 #include <float.h> /* DBL_MAX */
28 #include <sys/sendfile.h>
31 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
32 #include <boost/tokenizer.hpp>
33 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
36 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
37 * See https://www.akkadia.org/drepper/dsohowto.pdf
38 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
40 #define RTLD_DEEPBIND 0
45 const char* papi_default_config_name = "default";
47 struct papi_process_data {
48 papi_counter_t counter_data;
53 std::unordered_map<std::string, double> location2speedup;
55 simgrid::smpi::Process **process_data = nullptr;
56 int process_count = 0;
57 int smpi_universe_size = 0;
58 int* index_to_process_data = nullptr;
59 extern double smpi_total_benched_time;
60 xbt_os_timer_t global_timer;
61 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
62 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
63 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
64 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
65 static simgrid::config::Flag<double> smpi_wtime_sleep(
66 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
67 static simgrid::config::Flag<double> smpi_init_sleep(
68 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
70 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
72 int smpi_process_count()
77 simgrid::smpi::Process* smpi_process()
79 smx_actor_t me = SIMIX_process_self();
80 if (me == nullptr) // This happens sometimes (eg, when linking against NS3 because it pulls openMPI...)
82 simgrid::msg::ActorExt* msgExt = static_cast<simgrid::msg::ActorExt*>(me->data);
83 return static_cast<simgrid::smpi::Process*>(msgExt->data);
86 simgrid::smpi::Process* smpi_process_remote(int index)
88 return process_data[index_to_process_data[index]];
91 MPI_Comm smpi_process_comm_self(){
92 return smpi_process()->comm_self();
95 void smpi_process_init(int *argc, char ***argv){
96 simgrid::smpi::Process::init(argc, argv);
99 int smpi_process_index(){
100 return smpi_process()->index();
103 void * smpi_process_get_user_data(){
104 return smpi_process()->get_user_data();
107 void smpi_process_set_user_data(void *data){
108 return smpi_process()->set_user_data(data);
112 int smpi_global_size()
114 char *value = getenv("SMPI_GLOBAL_SIZE");
115 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
117 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
120 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
122 smpi_comm_copy_data_callback = callback;
125 static void print(std::vector<std::pair<size_t, size_t>> vec) {
126 std::fprintf(stderr, "{");
127 for (auto elt : vec) {
128 std::fprintf(stderr, "(0x%zx, 0x%zx),", elt.first, elt.second);
130 std::fprintf(stderr, "}\n");
132 static void memcpy_private(void* dest, const void* src, std::vector<std::pair<size_t, size_t>>& private_blocks)
134 for(auto block : private_blocks) {
135 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
139 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
140 for(auto block : private_blocks) {
141 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
145 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
147 simgrid::kernel::activity::CommImplPtr comm =
148 boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(synchro);
151 size_t src_offset = 0;
152 size_t dst_offset = 0;
153 std::vector<std::pair<size_t, size_t>> src_private_blocks;
154 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
155 XBT_DEBUG("Copy the data over");
156 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
157 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
158 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
161 src_private_blocks.clear();
162 src_private_blocks.push_back(std::make_pair(0, buff_size));
164 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
165 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
166 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
169 dst_private_blocks.clear();
170 dst_private_blocks.push_back(std::make_pair(0, buff_size));
172 check_blocks(src_private_blocks, buff_size);
173 check_blocks(dst_private_blocks, buff_size);
174 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
175 check_blocks(private_blocks, buff_size);
177 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && (static_cast<char*>(buff) >= smpi_start_data_exe)
178 && (static_cast<char*>(buff) < smpi_start_data_exe + smpi_size_data_exe )
180 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
182 smpi_switch_data_segment(
183 static_cast<simgrid::smpi::Process*>((static_cast<simgrid::msg::ActorExt*>(comm->src_proc->data)->data))
185 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
186 memcpy_private(tmpbuff, buff, private_blocks);
189 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && ((char*)comm->dst_buff >= smpi_start_data_exe)
190 && ((char*)comm->dst_buff < smpi_start_data_exe + smpi_size_data_exe )){
191 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
192 smpi_switch_data_segment(
193 static_cast<simgrid::smpi::Process*>((static_cast<simgrid::msg::ActorExt*>(comm->dst_proc->data)->data))
196 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
197 memcpy_private(comm->dst_buff, tmpbuff, private_blocks);
199 if (comm->detached) {
200 // if this is a detached send, the source buffer was duplicated by SMPI
201 // sender to make the original buffer available to the application ASAP
203 //It seems that the request is used after the call there this should be free somewhere else but where???
204 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
205 comm->src_buff = nullptr;
207 if(tmpbuff!=buff)xbt_free(tmpbuff);
211 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
213 /* nothing done in this version */
216 static void smpi_check_options(){
217 //check correctness of MPI parameters
219 xbt_assert(xbt_cfg_get_int("smpi/async-small-thresh") <= xbt_cfg_get_int("smpi/send-is-detached-thresh"));
221 if (xbt_cfg_is_default_value("smpi/host-speed")) {
222 XBT_INFO("You did not set the power of the host running the simulation. "
223 "The timings will certainly not be accurate. "
224 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
225 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
228 xbt_assert(xbt_cfg_get_double("smpi/cpu-threshold") >=0,
229 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
230 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
234 return process_data != nullptr;
237 void smpi_global_init()
241 if (not MC_is_active()) {
242 global_timer = xbt_os_timer_new();
243 xbt_os_walltimer_start(global_timer);
246 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') {
247 std::string filename {xbt_cfg_get_string("smpi/comp-adjustment-file")};
248 std::ifstream fstream(filename);
249 if (not fstream.is_open()) {
250 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
254 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
255 std::getline(fstream, line); // Skip the header line
256 while (std::getline(fstream, line)) {
258 Tokenizer::iterator it = tok.begin();
259 Tokenizer::iterator end = std::next(tok.begin());
261 std::string location = *it;
262 boost::trim(location);
263 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
268 // This map holds for each computation unit (such as "default" or "process1" etc.)
269 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
270 // and the (computed) event_set.
271 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
273 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
274 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
275 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
276 " Expected version is %i",
279 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
280 boost::char_separator<char> separator_units(";");
281 std::string str = std::string(xbt_cfg_get_string("smpi/papi-events"));
282 Tokenizer tokens(str, separator_units);
284 // Iterate over all the computational units. This could be
285 // processes, hosts, threads, ranks... You name it. I'm not exactly
286 // sure what we will support eventually, so I'll leave it at the
287 // general term "units".
288 for (auto& unit_it : tokens) {
289 boost::char_separator<char> separator_events(":");
290 Tokenizer event_tokens(unit_it, separator_events);
292 int event_set = PAPI_NULL;
293 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
294 // TODO: Should this let the whole simulation die?
295 XBT_CRITICAL("Could not create PAPI event set during init.");
298 // NOTE: We cannot use a map here, as we must obey the order of the counters
299 // This is important for PAPI: We need to map the values of counters back
300 // to the event_names (so, when PAPI_read() has finished)!
301 papi_counter_t counters2values;
303 // Iterate over all counters that were specified for this specific
305 // Note that we need to remove the name of the unit
306 // (that could also be the "default" value), which always comes first.
307 // Hence, we start at ++(events.begin())!
308 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); events_it++) {
310 int event_code = PAPI_NULL;
311 char* event_name = const_cast<char*>((*events_it).c_str());
312 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
313 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
314 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
317 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
320 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
324 counters2values.push_back(
325 // We cannot just pass *events_it, as this is of type const basic_string
326 std::make_pair<std::string, long long>(std::string(*events_it), 0));
329 std::string unit_name = *(event_tokens.begin());
330 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
332 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
338 msg_bar_t finalization_barrier = nullptr;
339 if (process_count == 0){
340 process_count = SIMIX_process_count();
342 finalization_barrier = MSG_barrier_init(process_count);
344 smpi_universe_size = process_count;
345 process_data = new simgrid::smpi::Process*[process_count];
346 for (int i = 0; i < process_count; i++) {
347 process_data[i] = new simgrid::smpi::Process(i, finalization_barrier);
349 //if the process was launched through smpirun script we generate a global mpi_comm_world
350 //if not, we let MPI_COMM_NULL, and the comm world will be private to each mpi instance
352 group = new simgrid::smpi::Group(process_count);
353 MPI_COMM_WORLD = new simgrid::smpi::Comm(group, nullptr);
354 MPI_Attr_put(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, reinterpret_cast<void *>(process_count));
356 for (int i = 0; i < process_count; i++)
357 group->set_mapping(i, i);
361 void smpi_global_destroy()
363 int count = smpi_process_count();
365 smpi_bench_destroy();
366 smpi_shared_destroy();
367 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
368 delete MPI_COMM_WORLD->group();
369 MSG_barrier_destroy(process_data[0]->finalization_barrier());
371 smpi_deployment_cleanup_instances();
373 for (int i = 0; i < count; i++) {
374 if(process_data[i]->comm_self()!=MPI_COMM_NULL){
375 simgrid::smpi::Comm::destroy(process_data[i]->comm_self());
377 if(process_data[i]->comm_intra()!=MPI_COMM_NULL){
378 simgrid::smpi::Comm::destroy(process_data[i]->comm_intra());
380 xbt_os_timer_free(process_data[i]->timer());
381 xbt_mutex_destroy(process_data[i]->mailboxes_mutex());
382 delete process_data[i];
384 delete[] process_data;
385 process_data = nullptr;
387 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
388 MPI_COMM_WORLD->cleanup_smp();
389 MPI_COMM_WORLD->cleanup_attr<simgrid::smpi::Comm>();
390 if(simgrid::smpi::Colls::smpi_coll_cleanup_callback!=nullptr)
391 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
392 delete MPI_COMM_WORLD;
395 MPI_COMM_WORLD = MPI_COMM_NULL;
397 if (not MC_is_active()) {
398 xbt_os_timer_free(global_timer);
401 xbt_free(index_to_process_data);
402 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
403 smpi_destroy_global_memory_segments();
409 static void smpi_init_logs(){
411 /* Connect log categories. See xbt/log.c */
413 XBT_LOG_CONNECT(smpi); /* Keep this line as soon as possible in this function: xbt_log_appender_file.c depends on it
414 DO NOT connect this in XBT or so, or it will be useless to xbt_log_appender_file.c */
415 XBT_LOG_CONNECT(instr_smpi);
416 XBT_LOG_CONNECT(smpi_bench);
417 XBT_LOG_CONNECT(smpi_coll);
418 XBT_LOG_CONNECT(smpi_colls);
419 XBT_LOG_CONNECT(smpi_comm);
420 XBT_LOG_CONNECT(smpi_datatype);
421 XBT_LOG_CONNECT(smpi_dvfs);
422 XBT_LOG_CONNECT(smpi_group);
423 XBT_LOG_CONNECT(smpi_kernel);
424 XBT_LOG_CONNECT(smpi_mpi);
425 XBT_LOG_CONNECT(smpi_memory);
426 XBT_LOG_CONNECT(smpi_op);
427 XBT_LOG_CONNECT(smpi_pmpi);
428 XBT_LOG_CONNECT(smpi_request);
429 XBT_LOG_CONNECT(smpi_replay);
430 XBT_LOG_CONNECT(smpi_rma);
431 XBT_LOG_CONNECT(smpi_shared);
432 XBT_LOG_CONNECT(smpi_utils);
436 static void smpi_init_options(){
437 //return if already called
438 if (smpi_cpu_threshold > -1)
440 simgrid::smpi::Colls::set_collectives();
441 simgrid::smpi::Colls::smpi_coll_cleanup_callback=nullptr;
442 smpi_cpu_threshold = xbt_cfg_get_double("smpi/cpu-threshold");
443 smpi_host_speed = xbt_cfg_get_double("smpi/host-speed");
444 const char* smpi_privatize_option = xbt_cfg_get_string("smpi/privatization");
445 if (std::strcmp(smpi_privatize_option, "no") == 0)
446 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
447 else if (std::strcmp(smpi_privatize_option, "yes") == 0)
448 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
449 else if (std::strcmp(smpi_privatize_option, "mmap") == 0)
450 smpi_privatize_global_variables = SMPI_PRIVATIZE_MMAP;
451 else if (std::strcmp(smpi_privatize_option, "dlopen") == 0)
452 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
454 // Some compatibility stuff:
455 else if (std::strcmp(smpi_privatize_option, "1") == 0)
456 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
457 else if (std::strcmp(smpi_privatize_option, "0") == 0)
458 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
461 xbt_die("Invalid value for smpi/privatization: '%s'", smpi_privatize_option);
463 #if defined(__FreeBSD__)
464 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) {
465 XBT_INFO("Mixing mmap privatization is broken on FreeBSD, switching to dlopen privatization instead.");
466 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
470 if (smpi_cpu_threshold < 0)
471 smpi_cpu_threshold = DBL_MAX;
473 char* val = xbt_cfg_get_string("smpi/shared-malloc");
474 if (not strcasecmp(val, "yes") || not strcmp(val, "1") || not strcasecmp(val, "on") ||
475 not strcasecmp(val, "global")) {
476 smpi_cfg_shared_malloc = shmalloc_global;
477 } else if (not strcasecmp(val, "local")) {
478 smpi_cfg_shared_malloc = shmalloc_local;
479 } else if (not strcasecmp(val, "no") || not strcmp(val, "0") || not strcasecmp(val, "off")) {
480 smpi_cfg_shared_malloc = shmalloc_none;
482 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
487 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
488 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
489 typedef void (*smpi_fortran_entry_point_type)();
491 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
493 char noarg[] = {'\0'};
494 const int argc = args.size();
495 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
496 for (int i = 0; i != argc; ++i)
497 argv[i] = args[i].empty() ? noarg : &args[i].front();
498 argv[argc] = nullptr;
500 int res = entry_point(argc, argv.get());
502 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
503 smpi_process()->set_return_value(res);
508 // TODO, remove the number of functions involved here
509 static smpi_entry_point_type smpi_resolve_function(void* handle)
511 smpi_fortran_entry_point_type entry_point_fortran = (smpi_fortran_entry_point_type)dlsym(handle, "user_main_");
512 if (entry_point_fortran != nullptr) {
513 return [entry_point_fortran](int argc, char** argv) {
514 smpi_process_init(&argc, &argv);
515 entry_point_fortran();
520 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type)dlsym(handle, "main");
521 if (entry_point != nullptr) {
525 return smpi_entry_point_type();
528 int smpi_main(const char* executable, int argc, char *argv[])
530 srand(SMPI_RAND_SEED);
532 if (getenv("SMPI_PRETEND_CC") != nullptr) {
533 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
534 * configuration tools */
538 TRACE_global_init(&argc, argv);
540 SIMIX_global_init(&argc, argv);
541 MSG_init(&argc,argv);
543 SMPI_switch_data_segment = &smpi_switch_data_segment;
545 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
546 host.extension_set(new simgrid::smpi::SmpiHost(&host));
549 // parse the platform file: get the host list
550 SIMIX_create_environment(argv[1]);
551 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
555 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_DLOPEN) {
557 std::string executable_copy = executable;
559 // Prepare the copy of the binary (get its size)
560 struct stat fdin_stat;
561 stat(executable_copy.c_str(), &fdin_stat);
562 off_t fdin_size = fdin_stat.st_size;
563 static std::size_t rank = 0;
565 simix_global->default_function = [executable_copy, fdin_size](std::vector<std::string> args) {
566 return std::function<void()>([executable_copy, fdin_size, args] {
568 // Copy the dynamic library:
569 std::string target_executable = executable_copy
570 + "_" + std::to_string(getpid())
571 + "_" + std::to_string(rank++) + ".so";
573 int fdin = open(executable_copy.c_str(), O_RDONLY);
574 xbt_assert(fdin >= 0, "Cannot read from %s", executable_copy.c_str());
575 int fdout = open(target_executable.c_str(), O_CREAT | O_RDWR, S_IRWXU);
576 xbt_assert(fdout >= 0, "Cannot write into %s", target_executable.c_str());
579 ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
580 xbt_assert(sent_size == fdin_size,
581 "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
582 target_executable.c_str(), sent_size, fdin_size, errno, strerror(errno));
584 XBT_VERB("Copy %d bytes into %s", static_cast<int>(fdin_size), target_executable.c_str());
585 const int bufsize = 1024 * 1024 * 4;
587 while (int got = read(fdin, buf, bufsize)) {
589 xbt_assert(errno == EINTR, "Cannot read from %s", executable_copy.c_str());
593 while (int done = write(fdout, p, todo)) {
595 xbt_assert(errno == EINTR, "Cannot write into %s", target_executable.c_str());
607 // Load the copy and resolve the entry point:
608 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
609 if (xbt_cfg_get_boolean("smpi/keep-temps") == false)
610 unlink(target_executable.c_str());
611 if (handle == nullptr)
612 xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), errno, strerror(errno));
613 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
615 xbt_die("Could not resolve entry point");
617 smpi_run_entry_point(entry_point, args);
624 // Load the dynamic library and resolve the entry point:
625 void* handle = dlopen(executable, RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
626 if (handle == nullptr)
627 xbt_die("dlopen failed for %s: %s (errno: %d -- %s)", executable, dlerror(), errno, strerror(errno));
628 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
630 xbt_die("main not found in %s", executable);
631 // TODO, register the executable for SMPI privatization
633 // Execute the same entry point for each simulated process:
634 simix_global->default_function = [entry_point](std::vector<std::string> args) {
635 return std::function<void()>([entry_point, args] {
636 smpi_run_entry_point(entry_point, args);
642 SIMIX_launch_application(argv[2]);
646 /* Clean IO before the run */
650 if (MC_is_active()) {
656 xbt_os_walltimer_stop(global_timer);
657 if (xbt_cfg_get_boolean("smpi/display-timing")){
658 double global_time = xbt_os_timer_elapsed(global_timer);
659 XBT_INFO("Simulated time: %g seconds. \n\n"
660 "The simulation took %g seconds (after parsing and platform setup)\n"
661 "%g seconds were actual computation of the application",
662 SIMIX_get_clock(), global_time , smpi_total_benched_time);
664 if (smpi_total_benched_time/global_time>=0.75)
665 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
666 "You may want to use sampling functions or trace replay to reduce this.");
669 int count = smpi_process_count();
671 for (int i = 0; i < count; i++) {
672 if(process_data[i]->return_value()!=0){
673 ret=process_data[i]->return_value();//return first non 0 value
677 smpi_global_destroy();
684 // Called either directly from the user code, or from the code called by smpirun
689 smpi_check_options();
691 simgrid::surf::surfExitCallbacks.connect(TRACE_smpi_release);
692 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
693 smpi_initialize_global_memory_segments();
696 void SMPI_finalize(){
697 smpi_global_destroy();
700 void smpi_mpi_init() {
701 if(smpi_init_sleep > 0)
702 simcall_process_sleep(smpi_init_sleep);
705 double smpi_mpi_wtime(){
707 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
709 time = SIMIX_get_clock();
710 // to avoid deadlocks if used as a break condition, such as
711 // while (MPI_Wtime(...) < time_limit) {
714 // because the time will not normally advance when only calls to MPI_Wtime
715 // are made -> deadlock (MPI_Wtime never reaches the time limit)
716 if(smpi_wtime_sleep > 0)
717 simcall_process_sleep(smpi_wtime_sleep);
720 time = SIMIX_get_clock();