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. */
10 #include <sys/types.h>
15 #include "private.hpp"
16 #include "simgrid/s4u/Mailbox.hpp"
17 #include "smpi/smpi_shared_malloc.hpp"
18 #include "simgrid/sg_config.h"
19 #include "src/kernel/activity/SynchroComm.hpp"
20 #include "src/mc/mc_record.h"
21 #include "src/mc/mc_replay.h"
22 #include "src/msg/msg_private.h"
23 #include "src/simix/smx_private.h"
24 #include "src/surf/surf_interface.hpp"
25 #include "src/smpi/SmpiHost.hpp"
26 #include "surf/surf.h"
27 #include "xbt/replay.hpp"
28 #include <xbt/config.hpp>
30 #include <float.h> /* DBL_MAX */
42 #include <sys/sendfile.h>
45 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_kernel, smpi, "Logging specific to SMPI (kernel)");
46 #include <boost/tokenizer.hpp>
47 #include <boost/algorithm/string.hpp> /* trim_right / trim_left */
50 /* RTLD_DEEPBIND is a bad idea of GNU ld that obviously does not exist on other platforms
51 * See https://www.akkadia.org/drepper/dsohowto.pdf
52 * and https://lists.freebsd.org/pipermail/freebsd-current/2016-March/060284.html
54 #define RTLD_DEEPBIND 0
57 /* Mac OSX does not have any header file providing that definition so we have to duplicate it here. Bummers. */
58 extern char** environ; /* we use it in posix_spawnp below */
62 const char* papi_default_config_name = "default";
64 struct papi_process_data {
65 papi_counter_t counter_data;
70 std::unordered_map<std::string, double> location2speedup;
72 simgrid::smpi::Process **process_data = nullptr;
73 int process_count = 0;
74 int smpi_universe_size = 0;
75 int* index_to_process_data = nullptr;
76 extern double smpi_total_benched_time;
77 xbt_os_timer_t global_timer;
78 MPI_Comm MPI_COMM_WORLD = MPI_COMM_UNINITIALIZED;
79 MPI_Errhandler *MPI_ERRORS_RETURN = nullptr;
80 MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
81 MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
82 static simgrid::config::Flag<double> smpi_wtime_sleep(
83 "smpi/wtime", "Minimum time to inject inside a call to MPI_Wtime", 0.0);
84 static simgrid::config::Flag<double> smpi_init_sleep(
85 "smpi/init", "Time to inject inside a call to MPI_Init", 0.0);
87 void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
91 int smpi_process_count()
96 simgrid::smpi::Process* smpi_process()
98 simgrid::MsgActorExt* msgExt = static_cast<simgrid::MsgActorExt*>(SIMIX_process_self()->data);
99 return static_cast<simgrid::smpi::Process*>(msgExt->data);
102 simgrid::smpi::Process* smpi_process_remote(int index)
104 return process_data[index_to_process_data[index]];
107 MPI_Comm smpi_process_comm_self(){
108 return smpi_process()->comm_self();
111 void smpi_process_init(int *argc, char ***argv){
112 simgrid::smpi::Process::init(argc, argv);
115 int smpi_process_index(){
116 return smpi_process()->index();
120 int smpi_global_size()
122 char *value = getenv("SMPI_GLOBAL_SIZE");
123 xbt_assert(value,"Please set env var SMPI_GLOBAL_SIZE to the expected number of processes.");
125 return xbt_str_parse_int(value, "SMPI_GLOBAL_SIZE contains a non-numerical value: %s");
128 void smpi_comm_set_copy_data_callback(void (*callback) (smx_activity_t, void*, size_t))
130 smpi_comm_copy_data_callback = callback;
133 static void print(std::vector<std::pair<size_t, size_t>> vec) {
134 fprintf(stderr, "{");
136 fprintf(stderr, "(0x%lx, 0x%lx),", elt.first, elt.second);
138 fprintf(stderr, "}\n");
140 static void memcpy_private(void *dest, const void *src, size_t n, std::vector<std::pair<size_t, size_t>> &private_blocks) {
141 for(auto block : private_blocks) {
142 memcpy((uint8_t*)dest+block.first, (uint8_t*)src+block.first, block.second-block.first);
146 static void check_blocks(std::vector<std::pair<size_t, size_t>> &private_blocks, size_t buff_size) {
147 for(auto block : private_blocks) {
148 xbt_assert(block.first <= block.second && block.second <= buff_size, "Oops, bug in shared malloc.");
152 void smpi_comm_copy_buffer_callback(smx_activity_t synchro, void *buff, size_t buff_size)
154 simgrid::kernel::activity::Comm *comm = dynamic_cast<simgrid::kernel::activity::Comm*>(synchro);
155 int src_shared=0, dst_shared=0;
156 size_t src_offset=0, dst_offset=0;
157 std::vector<std::pair<size_t, size_t>> src_private_blocks;
158 std::vector<std::pair<size_t, size_t>> dst_private_blocks;
159 XBT_DEBUG("Copy the data over");
160 if((src_shared=smpi_is_shared(buff, src_private_blocks, &src_offset))) {
161 XBT_DEBUG("Sender %p is shared. Let's ignore it.", buff);
162 src_private_blocks = shift_and_frame_private_blocks(src_private_blocks, src_offset, buff_size);
165 src_private_blocks.clear();
166 src_private_blocks.push_back(std::make_pair(0, buff_size));
168 if((dst_shared=smpi_is_shared((char*)comm->dst_buff, dst_private_blocks, &dst_offset))) {
169 XBT_DEBUG("Receiver %p is shared. Let's ignore it.", (char*)comm->dst_buff);
170 dst_private_blocks = shift_and_frame_private_blocks(dst_private_blocks, dst_offset, buff_size);
173 dst_private_blocks.clear();
174 dst_private_blocks.push_back(std::make_pair(0, buff_size));
176 check_blocks(src_private_blocks, buff_size);
177 check_blocks(dst_private_blocks, buff_size);
178 auto private_blocks = merge_private_blocks(src_private_blocks, dst_private_blocks);
179 check_blocks(private_blocks, buff_size);
181 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && (static_cast<char*>(buff) >= smpi_start_data_exe)
182 && (static_cast<char*>(buff) < smpi_start_data_exe + smpi_size_data_exe )
184 XBT_DEBUG("Privatization : We are copying from a zone inside global memory... Saving data to temp buffer !");
186 smpi_switch_data_segment(
187 (static_cast<simgrid::smpi::Process*>((static_cast<simgrid::MsgActorExt*>(comm->src_proc->data)->data))->index()));
188 tmpbuff = static_cast<void*>(xbt_malloc(buff_size));
189 memcpy_private(tmpbuff, buff, buff_size, private_blocks);
192 if((smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) && ((char*)comm->dst_buff >= smpi_start_data_exe)
193 && ((char*)comm->dst_buff < smpi_start_data_exe + smpi_size_data_exe )){
194 XBT_DEBUG("Privatization : We are copying to a zone inside global memory - Switch data segment");
195 smpi_switch_data_segment(
196 (static_cast<simgrid::smpi::Process*>((static_cast<simgrid::MsgActorExt*>(comm->dst_proc->data)->data))->index()));
198 XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff,comm->dst_buff);
199 memcpy_private(comm->dst_buff, tmpbuff, buff_size, private_blocks);
201 if (comm->detached) {
202 // if this is a detached send, the source buffer was duplicated by SMPI
203 // sender to make the original buffer available to the application ASAP
205 //It seems that the request is used after the call there this should be free somewhere else but where???
206 //xbt_free(comm->comm.src_data);// inside SMPI the request is kept inside the user data and should be free
207 comm->src_buff = nullptr;
209 if(tmpbuff!=buff)xbt_free(tmpbuff);
213 void smpi_comm_null_copy_buffer_callback(smx_activity_t comm, void *buff, size_t buff_size)
215 /* nothing done in this version */
218 static void smpi_check_options(){
219 //check correctness of MPI parameters
221 xbt_assert(xbt_cfg_get_int("smpi/async-small-thresh") <= xbt_cfg_get_int("smpi/send-is-detached-thresh"));
223 if (xbt_cfg_is_default_value("smpi/host-speed")) {
224 XBT_INFO("You did not set the power of the host running the simulation. "
225 "The timings will certainly not be accurate. "
226 "Use the option \"--cfg=smpi/host-speed:<flops>\" to set its value."
227 "Check http://simgrid.org/simgrid/latest/doc/options.html#options_smpi_bench for more information.");
230 xbt_assert(xbt_cfg_get_double("smpi/cpu-threshold") >=0,
231 "The 'smpi/cpu-threshold' option cannot have negative values [anymore]. If you want to discard "
232 "the simulation of any computation, please use 'smpi/simulate-computation:no' instead.");
236 return process_data != nullptr;
239 void smpi_global_init()
243 if (!MC_is_active()) {
244 global_timer = xbt_os_timer_new();
245 xbt_os_walltimer_start(global_timer);
248 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') {
249 std::string filename {xbt_cfg_get_string("smpi/comp-adjustment-file")};
250 std::ifstream fstream(filename);
251 if (!fstream.is_open()) {
252 xbt_die("Could not open file %s. Does it exist?", filename.c_str());
256 typedef boost::tokenizer< boost::escaped_list_separator<char>> Tokenizer;
257 std::getline(fstream, line); // Skip the header line
258 while (std::getline(fstream, line)) {
260 Tokenizer::iterator it = tok.begin();
261 Tokenizer::iterator end = std::next(tok.begin());
263 std::string location = *it;
264 boost::trim(location);
265 location2speedup.insert(std::pair<std::string, double>(location, std::stod(*end)));
270 // This map holds for each computation unit (such as "default" or "process1" etc.)
271 // the configuration as given by the user (counter data as a pair of (counter_name, counter_counter))
272 // and the (computed) event_set.
273 std::map</* computation unit name */ std::string, papi_process_data> units2papi_setup;
275 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
276 if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
277 XBT_ERROR("Could not initialize PAPI library; is it correctly installed and linked?"
278 " Expected version is %i",
281 typedef boost::tokenizer<boost::char_separator<char>> Tokenizer;
282 boost::char_separator<char> separator_units(";");
283 std::string str = std::string(xbt_cfg_get_string("smpi/papi-events"));
284 Tokenizer tokens(str, separator_units);
286 // Iterate over all the computational units. This could be
287 // processes, hosts, threads, ranks... You name it. I'm not exactly
288 // sure what we will support eventually, so I'll leave it at the
289 // general term "units".
290 for (auto& unit_it : tokens) {
291 boost::char_separator<char> separator_events(":");
292 Tokenizer event_tokens(unit_it, separator_events);
294 int event_set = PAPI_NULL;
295 if (PAPI_create_eventset(&event_set) != PAPI_OK) {
296 // TODO: Should this let the whole simulation die?
297 XBT_CRITICAL("Could not create PAPI event set during init.");
300 // NOTE: We cannot use a map here, as we must obey the order of the counters
301 // This is important for PAPI: We need to map the values of counters back
302 // to the event_names (so, when PAPI_read() has finished)!
303 papi_counter_t counters2values;
305 // Iterate over all counters that were specified for this specific
307 // Note that we need to remove the name of the unit
308 // (that could also be the "default" value), which always comes first.
309 // Hence, we start at ++(events.begin())!
310 for (Tokenizer::iterator events_it = ++(event_tokens.begin()); events_it != event_tokens.end(); events_it++) {
312 int event_code = PAPI_NULL;
313 char* event_name = const_cast<char*>((*events_it).c_str());
314 if (PAPI_event_name_to_code(event_name, &event_code) == PAPI_OK) {
315 if (PAPI_add_event(event_set, event_code) != PAPI_OK) {
316 XBT_ERROR("Could not add PAPI event '%s'. Skipping.", event_name);
319 XBT_DEBUG("Successfully added PAPI event '%s' to the event set.", event_name);
322 XBT_CRITICAL("Could not find PAPI event '%s'. Skipping.", event_name);
326 counters2values.push_back(
327 // We cannot just pass *events_it, as this is of type const basic_string
328 std::make_pair<std::string, long long>(std::string(*events_it), 0));
331 std::string unit_name = *(event_tokens.begin());
332 papi_process_data config = {.counter_data = std::move(counters2values), .event_set = event_set};
334 units2papi_setup.insert(std::make_pair(unit_name, std::move(config)));
340 msg_bar_t finalization_barrier = nullptr;
341 if (process_count == 0){
342 process_count = SIMIX_process_count();
344 finalization_barrier = MSG_barrier_init(process_count);
346 smpi_universe_size = process_count;
347 process_data = new simgrid::smpi::Process*[process_count];
348 for (int i = 0; i < process_count; i++) {
349 process_data[i] = new simgrid::smpi::Process(i, finalization_barrier);
351 //if the process was launched through smpirun script we generate a global mpi_comm_world
352 //if not, we let MPI_COMM_NULL, and the comm world will be private to each mpi instance
354 group = new simgrid::smpi::Group(process_count);
355 MPI_COMM_WORLD = new simgrid::smpi::Comm(group, nullptr);
356 MPI_Attr_put(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, reinterpret_cast<void *>(process_count));
358 for (int i = 0; i < process_count; i++)
359 group->set_mapping(i, i);
363 void smpi_global_destroy()
365 int count = smpi_process_count();
367 smpi_bench_destroy();
368 smpi_shared_destroy();
369 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
370 delete MPI_COMM_WORLD->group();
371 MSG_barrier_destroy(process_data[0]->finalization_barrier());
373 smpi_deployment_cleanup_instances();
375 for (int i = 0; i < count; i++) {
376 if(process_data[i]->comm_self()!=MPI_COMM_NULL){
377 simgrid::smpi::Comm::destroy(process_data[i]->comm_self());
379 if(process_data[i]->comm_intra()!=MPI_COMM_NULL){
380 simgrid::smpi::Comm::destroy(process_data[i]->comm_intra());
382 xbt_os_timer_free(process_data[i]->timer());
383 xbt_mutex_destroy(process_data[i]->mailboxes_mutex());
384 delete process_data[i];
386 delete[] process_data;
387 process_data = nullptr;
389 if (MPI_COMM_WORLD != MPI_COMM_UNINITIALIZED){
390 MPI_COMM_WORLD->cleanup_smp();
391 MPI_COMM_WORLD->cleanup_attr<simgrid::smpi::Comm>();
392 if(simgrid::smpi::Colls::smpi_coll_cleanup_callback!=nullptr)
393 simgrid::smpi::Colls::smpi_coll_cleanup_callback();
394 delete MPI_COMM_WORLD;
397 MPI_COMM_WORLD = MPI_COMM_NULL;
399 if (!MC_is_active()) {
400 xbt_os_timer_free(global_timer);
403 xbt_free(index_to_process_data);
404 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
405 smpi_destroy_global_memory_segments();
411 static void smpi_init_logs(){
413 /* Connect log categories. See xbt/log.c */
415 XBT_LOG_CONNECT(smpi); /* Keep this line as soon as possible in this function: xbt_log_appender_file.c depends on it
416 DO NOT connect this in XBT or so, or it will be useless to xbt_log_appender_file.c */
417 XBT_LOG_CONNECT(instr_smpi);
418 XBT_LOG_CONNECT(smpi_bench);
419 XBT_LOG_CONNECT(smpi_coll);
420 XBT_LOG_CONNECT(smpi_colls);
421 XBT_LOG_CONNECT(smpi_comm);
422 XBT_LOG_CONNECT(smpi_datatype);
423 XBT_LOG_CONNECT(smpi_dvfs);
424 XBT_LOG_CONNECT(smpi_group);
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_request);
431 XBT_LOG_CONNECT(smpi_replay);
432 XBT_LOG_CONNECT(smpi_rma);
433 XBT_LOG_CONNECT(smpi_shared);
434 XBT_LOG_CONNECT(smpi_utils);
438 static void smpi_init_options(){
439 //return if already called
440 if(smpi_cpu_threshold!=-1)
442 simgrid::smpi::Colls::set_collectives();
443 simgrid::smpi::Colls::smpi_coll_cleanup_callback=nullptr;
444 smpi_cpu_threshold = xbt_cfg_get_double("smpi/cpu-threshold");
445 smpi_host_speed = xbt_cfg_get_double("smpi/host-speed");
446 const char* smpi_privatize_option = xbt_cfg_get_string("smpi/privatize-global-variables");
447 if (std::strcmp(smpi_privatize_option, "no") == 0)
448 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
449 else if (std::strcmp(smpi_privatize_option, "yes") == 0)
450 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
451 else if (std::strcmp(smpi_privatize_option, "mmap") == 0)
452 smpi_privatize_global_variables = SMPI_PRIVATIZE_MMAP;
453 else if (std::strcmp(smpi_privatize_option, "dlopen") == 0)
454 smpi_privatize_global_variables = SMPI_PRIVATIZE_DLOPEN;
456 // Some compatibility stuff:
457 else if (std::strcmp(smpi_privatize_option, "1") == 0)
458 smpi_privatize_global_variables = SMPI_PRIVATIZE_DEFAULT;
459 else if (std::strcmp(smpi_privatize_option, "0") == 0)
460 smpi_privatize_global_variables = SMPI_PRIVATIZE_NONE;
463 xbt_die("Invalid value for smpi/privatize-global-variables: %s",
464 smpi_privatize_option);
466 if (smpi_cpu_threshold < 0)
467 smpi_cpu_threshold = DBL_MAX;
469 char* val = xbt_cfg_get_string("smpi/shared-malloc");
470 if (!strcasecmp(val, "yes") || !strcmp(val, "1") || !strcasecmp(val, "on") || !strcasecmp(val, "global")) {
471 smpi_cfg_shared_malloc = shmalloc_global;
472 } else if (!strcasecmp(val, "local")) {
473 smpi_cfg_shared_malloc = shmalloc_local;
474 } else if (!strcasecmp(val, "no") || !strcmp(val, "0") || !strcasecmp(val, "off")) {
475 smpi_cfg_shared_malloc = shmalloc_none;
477 xbt_die("Invalid value '%s' for option smpi/shared-malloc. Possible values: 'on' or 'global', 'local', 'off'",
482 typedef std::function<int(int argc, char *argv[])> smpi_entry_point_type;
483 typedef int (* smpi_c_entry_point_type)(int argc, char **argv);
484 typedef void (* smpi_fortran_entry_point_type)(void);
486 static int smpi_run_entry_point(smpi_entry_point_type entry_point, std::vector<std::string> args)
488 const int argc = args.size();
489 std::unique_ptr<char*[]> argv(new char*[argc + 1]);
490 for (int i = 0; i != argc; ++i)
491 argv[i] = args[i].empty() ? const_cast<char*>(""): &args[i].front();
492 argv[argc] = nullptr;
494 int res = entry_point(argc, argv.get());
496 XBT_WARN("SMPI process did not return 0. Return value : %d", res);
497 smpi_process()->set_return_value(res);
502 // TODO, remove the number of functions involved here
503 static smpi_entry_point_type smpi_resolve_function(void* handle)
505 smpi_fortran_entry_point_type entry_point2 =
506 (smpi_fortran_entry_point_type) dlsym(handle, "user_main_");
507 if (entry_point2 != nullptr) {
508 // fprintf(stderr, "EP user_main_=%p\n", entry_point2);
509 return [entry_point2](int argc, char** argv) {
510 smpi_process_init(&argc, &argv);
516 smpi_c_entry_point_type entry_point = (smpi_c_entry_point_type) dlsym(handle, "main");
517 if (entry_point != nullptr) {
518 // fprintf(stderr, "EP main=%p\n", entry_point);
522 return smpi_entry_point_type();
525 int smpi_main(const char* executable, int argc, char *argv[])
527 srand(SMPI_RAND_SEED);
529 if (getenv("SMPI_PRETEND_CC") != nullptr) {
530 /* Hack to ensure that smpicc can pretend to be a simple compiler. Particularly handy to pass it to the
531 * configuration tools */
535 TRACE_global_init(&argc, argv);
537 SIMIX_global_init(&argc, argv);
538 MSG_init(&argc,argv);
540 SMPI_switch_data_segment = &smpi_switch_data_segment;
542 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
543 host.extension_set(new simgrid::smpi::SmpiHost(&host));
546 // parse the platform file: get the host list
547 SIMIX_create_environment(argv[1]);
548 SIMIX_comm_set_copy_data_callback(smpi_comm_copy_buffer_callback);
550 static std::size_t rank = 0;
554 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_DLOPEN) {
556 std::string executable_copy = executable;
558 // Prepare the copy of the binary (open the file and get its size)
559 // (fdin will remain open for the whole process execution. That's a sort of leak but we can live with it)
560 int fdin = open(executable_copy.c_str(), O_RDONLY);
561 xbt_assert(fdin >= 0, "Cannot read from %s", executable_copy.c_str());
562 struct stat fdin_stat;
563 fstat(fdin, &fdin_stat);
564 off_t fdin_size = fdin_stat.st_size;
566 simix_global->default_function = [executable_copy, fdin, fdin_size](std::vector<std::string> args) {
567 return std::function<void()>([executable_copy, fdin, fdin_size, args] {
569 // Copy the dynamic library:
570 std::string target_executable = executable_copy
571 + "_" + std::to_string(getpid())
572 + "_" + std::to_string(rank++) + ".so";
574 int fdout = open(target_executable.c_str(), O_WRONLY);
575 xbt_assert(fdout >= 0, "Cannot write into %s", target_executable.c_str());
578 sendfile(fdout, fdin, NULL, fdin_size);
580 XBT_WARN("Copy %d bytes into %s", static_cast<int>(fdin_size), target_executable.c_str());
581 const int bufsize = 1024 * 1024 * 4;
583 while (int got = read(fdin, buf, bufsize)) {
585 xbt_assert(errno == EINTR, "Cannot read from %s", executable_copy.c_str());
589 while (int done = write(fdout, p, todo)) {
591 xbt_assert(errno == EINTR, "Cannot write into %s", target_executable.c_str());
602 // Load the copy and resolve the entry point:
603 void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
604 unlink(target_executable.c_str());
605 if (handle == nullptr)
606 xbt_die("dlopen failed");
607 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
609 xbt_die("Could not resolve entry point");
611 smpi_run_entry_point(entry_point, args);
618 // Load the dynamic library and resolve the entry point:
619 void* handle = dlopen(executable, RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
620 if (handle == nullptr)
621 xbt_die("dlopen failed for %s", executable);
622 smpi_entry_point_type entry_point = smpi_resolve_function(handle);
624 xbt_die("main not found in %s", executable);
625 // TODO, register the executable for SMPI privatization
627 // Execute the same entry point for each simulated process:
628 simix_global->default_function = [entry_point](std::vector<std::string> args) {
629 return std::function<void()>([entry_point, args] {
630 smpi_run_entry_point(entry_point, args);
636 SIMIX_launch_application(argv[2]);
640 /* Clean IO before the run */
644 if (MC_is_active()) {
650 xbt_os_walltimer_stop(global_timer);
651 if (xbt_cfg_get_boolean("smpi/display-timing")){
652 double global_time = xbt_os_timer_elapsed(global_timer);
653 XBT_INFO("Simulated time: %g seconds. \n\n"
654 "The simulation took %g seconds (after parsing and platform setup)\n"
655 "%g seconds were actual computation of the application",
656 SIMIX_get_clock(), global_time , smpi_total_benched_time);
658 if (smpi_total_benched_time/global_time>=0.75)
659 XBT_INFO("More than 75%% of the time was spent inside the application code.\n"
660 "You may want to use sampling functions or trace replay to reduce this.");
663 int count = smpi_process_count();
665 for (i = 0; i < count; i++) {
666 if(process_data[i]->return_value()!=0){
667 ret=process_data[i]->return_value();//return first non 0 value
671 smpi_global_destroy();
678 // Called either directly from the user code, or from the code called by smpirun
683 smpi_check_options();
685 simgrid::surf::surfExitCallbacks.connect(TRACE_smpi_release);
686 if(smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP)
687 smpi_initialize_global_memory_segments();
690 void SMPI_finalize(){
691 smpi_global_destroy();
694 void smpi_mpi_init() {
695 if(smpi_init_sleep > 0)
696 simcall_process_sleep(smpi_init_sleep);
699 double smpi_mpi_wtime(){
701 if (smpi_process()->initialized() != 0 && smpi_process()->finalized() == 0 && smpi_process()->sampling() == 0) {
703 time = SIMIX_get_clock();
704 // to avoid deadlocks if used as a break condition, such as
705 // while (MPI_Wtime(...) < time_limit) {
708 // because the time will not normally advance when only calls to MPI_Wtime
709 // are made -> deadlock (MPI_Wtime never reaches the time limit)
710 if(smpi_wtime_sleep > 0)
711 simcall_process_sleep(smpi_wtime_sleep);
714 time = SIMIX_get_clock();