1 /* Copyright (c) 2007, 2009-2017. 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. */
8 #include <unordered_map>
11 #include "src/internal_config.h"
13 #include "private.hpp"
16 #include "xbt/sysdep.h"
18 #include "surf/surf.h"
19 #include "simgrid/sg_config.h"
20 #include "simgrid/modelchecker.h"
21 #include "src/mc/mc_replay.h"
23 #include <sys/types.h>
30 #include <math.h> // sqrt
40 #define MAP_ANONYMOUS MAP_ANON
43 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_bench, smpi, "Logging specific to SMPI (benchmarking)");
45 /* Shared allocations are handled through shared memory segments.
46 * Associated data and metadata are used as follows:
49 * `allocs' dict ---- -.
50 * ---------- shared_data_t shared_metadata_t / | | |
51 * .->| <name> | ---> -------------------- <--. ----------------- | | | |
52 * | ---------- | fd of <name> | | | size of mmap | --| | | |
53 * | | count (2) | |-- | data | \ | | |
54 * `----------------- | <name> | | ----------------- ---- |
55 * -------------------- | ^ |
57 * | | `allocs_metadata' dict |
58 * | | ---------------------- |
59 * | `-- | <addr of mmap #1> |<-'
60 * | .-- | <addr of mmap #2> |<-.
61 * | | ---------------------- |
67 * | shared_metadata_t / | |
68 * | ----------------- | | |
69 * | | size of mmap | --| | |
71 * ----------------- | | |
76 #define PTR_STRLEN (2 + 2 * sizeof(void*) + 1)
78 xbt_dict_t samples = nullptr; /* Allocated on first use */
79 xbt_dict_t calls = nullptr; /* Allocated on first use */
81 double smpi_cpu_threshold;
82 double smpi_host_speed;
84 int smpi_loaded_page = -1;
85 char* smpi_start_data_exe = nullptr;
86 int smpi_size_data_exe = 0;
87 bool smpi_privatize_global_variables;
88 double smpi_total_benched_time = 0;
89 smpi_privatisation_region_t smpi_privatisation_regions;
93 /** Some location in the source code
95 * This information is used by SMPI_SHARED_MALLOC to allocate some shared memory for all simulated processes.
97 class smpi_source_location {
99 smpi_source_location(const char* filename, int line)
100 : filename(xbt_strdup(filename)), filename_length(strlen(filename)), line(line) {}
102 /** Pointer to a static string containing the file name */
103 char* filename = nullptr;
104 int filename_length = 0;
107 bool operator==(smpi_source_location const& that) const
109 return filename_length == that.filename_length
111 && std::memcmp(filename, that.filename, filename_length) == 0;
113 bool operator!=(smpi_source_location const& that) const
115 return !(*this == that);
124 class hash<smpi_source_location> {
126 typedef smpi_source_location argument_type;
127 typedef std::size_t result_type;
128 result_type operator()(smpi_source_location const& loc) const
130 return xbt_str_hash_ext(loc.filename, loc.filename_length)
131 ^ xbt_str_hash_ext((const char*) &loc.line, sizeof(loc.line));
144 std::unordered_map<smpi_source_location, shared_data_t> allocs;
145 typedef std::unordered_map<smpi_source_location, shared_data_t>::value_type shared_data_key_type;
149 shared_data_key_type* data;
152 std::unordered_map<void*, shared_metadata_t> allocs_metadata;
156 static size_t shm_size(int fd) {
159 if(fstat(fd, &st) < 0) {
160 xbt_die("Could not stat fd %d: %s", fd, strerror(errno));
162 return static_cast<size_t>(st.st_size);
166 static void* shm_map(int fd, size_t size, shared_data_key_type* data) {
167 char loc[PTR_STRLEN];
168 shared_metadata_t meta;
170 if(size > shm_size(fd) && (ftruncate(fd, static_cast<off_t>(size)) < 0)) {
171 xbt_die("Could not truncate fd %d to %zu: %s", fd, size, strerror(errno));
174 void* mem = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
175 if(mem == MAP_FAILED) {
177 "Failed to map fd %d with size %zu: %s\n"
178 "If you are running a lot of ranks, you may be exceeding the amount of mappings allowed per process.\n"
179 "On Linux systems, change this value with sudo sysctl -w vm.max_map_count=newvalue (default value: 65536)\n"
180 "Please see http://simgrid.gforge.inria.fr/simgrid/latest/doc/html/options.html#options_virt for more info.",
181 fd, size, strerror(errno));
183 snprintf(loc, PTR_STRLEN, "%p", mem);
186 allocs_metadata[mem] = meta;
187 XBT_DEBUG("MMAP %zu to %p", size, mem);
192 void smpi_bench_destroy()
195 allocs_metadata.clear();
196 xbt_dict_free(&samples);
197 xbt_dict_free(&calls);
200 extern "C" XBT_PUBLIC(void) smpi_execute_flops_(double *flops);
201 void smpi_execute_flops_(double *flops)
203 smpi_execute_flops(*flops);
206 extern "C" XBT_PUBLIC(void) smpi_execute_(double *duration);
207 void smpi_execute_(double *duration)
209 smpi_execute(*duration);
212 void smpi_execute_flops(double flops) {
213 XBT_DEBUG("Handle real computation time: %f flops", flops);
214 smx_activity_t action = simcall_execution_start("computation", flops, 1, 0);
215 simcall_set_category (action, TRACE_internal_smpi_get_category());
216 simcall_execution_wait(action);
217 smpi_switch_data_segment(smpi_process_index());
220 void smpi_execute(double duration)
222 if (duration >= smpi_cpu_threshold) {
223 XBT_DEBUG("Sleep for %g to handle real computation time", duration);
224 double flops = duration * smpi_host_speed;
225 int rank = smpi_process_index();
226 instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
227 extra->type=TRACING_COMPUTING;
228 extra->comp_size=flops;
229 TRACE_smpi_computing_in(rank, extra);
231 smpi_execute_flops(flops);
233 TRACE_smpi_computing_out(rank);
236 XBT_DEBUG("Real computation took %g while option smpi/cpu_threshold is set to %g => ignore it",
237 duration, smpi_cpu_threshold);
241 void smpi_bench_begin()
243 if (smpi_privatize_global_variables) {
244 smpi_switch_data_segment(smpi_process_index());
247 if (MC_is_active() || MC_record_replay_is_active())
251 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
252 int event_set = smpi_process_papi_event_set();
253 // PAPI_start sets everything to 0! See man(3) PAPI_start
254 if (PAPI_LOW_LEVEL_INITED == PAPI_is_initialized()) {
255 if (PAPI_start(event_set) != PAPI_OK) {
256 // TODO This needs some proper handling.
257 XBT_CRITICAL("Could not start PAPI counters.\n");
263 xbt_os_threadtimer_start(smpi_process_timer());
266 void smpi_bench_end()
268 if (MC_is_active() || MC_record_replay_is_active())
272 xbt_os_timer_t timer = smpi_process_timer();
273 xbt_os_threadtimer_stop(timer);
277 * An MPI function has been called and now is the right time to update
278 * our PAPI counters for this process.
280 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
281 papi_counter_t& counter_data = smpi_process_papi_counters();
282 int event_set = smpi_process_papi_event_set();
283 std::vector<long long> event_values = std::vector<long long>(counter_data.size());
285 if (PAPI_stop(event_set, &event_values[0]) != PAPI_OK) { // Error
286 XBT_CRITICAL("Could not stop PAPI counters.\n");
289 for (unsigned int i = 0; i < counter_data.size(); i++) {
290 counter_data[i].second += event_values[i];
291 // XBT_DEBUG("[%i] PAPI: Counter %s: Value is now %lli (got increment by %lli\n", smpi_process_index(),
292 // counter_data[i].first.c_str(), counter_data[i].second, event_values[i]);
298 if (smpi_process_get_sampling()) {
299 XBT_CRITICAL("Cannot do recursive benchmarks.");
300 XBT_CRITICAL("Are you trying to make a call to MPI within a SMPI_SAMPLE_ block?");
301 xbt_backtrace_display_current();
302 xbt_die("Aborting.");
305 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') { // Maybe we need to artificially speed up or slow
306 // down our computation based on our statistical analysis.
308 smpi_trace_call_location_t* loc = smpi_process_get_call_location();
309 std::string key = loc->get_composed_key();
310 std::unordered_map<std::string, double>::const_iterator it = location2speedup.find(key);
311 if (it != location2speedup.end()) {
312 speedup = it->second;
316 // Simulate the benchmarked computation unless disabled via command-line argument
317 if (xbt_cfg_get_boolean("smpi/simulate-computation")) {
318 smpi_execute(xbt_os_timer_elapsed(timer)/speedup);
322 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0' && TRACE_smpi_is_enabled()) {
323 char container_name[INSTR_DEFAULT_STR_SIZE];
324 smpi_container(smpi_process_index(), container_name, INSTR_DEFAULT_STR_SIZE);
325 container_t container = PJ_container_get(container_name);
326 papi_counter_t& counter_data = smpi_process_papi_counters();
328 for (auto& pair : counter_data) {
329 new_pajeSetVariable(surf_get_clock(), container,
330 PJ_type_get(/* countername */ pair.first.c_str(), container->type), pair.second);
335 smpi_total_benched_time += xbt_os_timer_elapsed(timer);
338 /* Private sleep function used by smpi_sleep() and smpi_usleep() */
339 static unsigned int private_sleep(double secs)
343 XBT_DEBUG("Sleep for: %lf secs", secs);
344 int rank = smpi_comm_rank(MPI_COMM_WORLD);
345 instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
346 extra->type=TRACING_SLEEPING;
347 extra->sleep_duration=secs;
348 TRACE_smpi_sleeping_in(rank, extra);
350 simcall_process_sleep(secs);
352 TRACE_smpi_sleeping_out(rank);
358 unsigned int smpi_sleep(unsigned int secs)
360 return private_sleep(static_cast<double>(secs));
363 int smpi_usleep(useconds_t usecs)
365 return static_cast<int>(private_sleep(static_cast<double>(usecs) / 1000000.0));
368 #if _POSIX_TIMERS > 0
369 int smpi_nanosleep(const struct timespec *tp, struct timespec * t)
371 return static_cast<int>(private_sleep(static_cast<double>(tp->tv_sec + tp->tv_nsec / 1000000000.0)));
375 int smpi_gettimeofday(struct timeval *tv, void* tz)
379 now = SIMIX_get_clock();
381 tv->tv_sec = static_cast<time_t>(now);
383 tv->tv_usec = static_cast<useconds_t>((now - tv->tv_sec) * 1e6);
385 tv->tv_usec = static_cast<suseconds_t>((now - tv->tv_sec) * 1e6);
392 #if _POSIX_TIMERS > 0
393 int smpi_clock_gettime(clockid_t clk_id, struct timespec *tp)
395 //there is only one time in SMPI, so clk_id is ignored.
398 now = SIMIX_get_clock();
400 tp->tv_sec = static_cast<time_t>(now);
401 tp->tv_nsec = static_cast<long int>((now - tp->tv_sec) * 1e9);
408 extern double sg_surf_precision;
409 unsigned long long smpi_rastro_resolution ()
412 double resolution = (1/sg_surf_precision);
414 return static_cast<unsigned long long>(resolution);
417 unsigned long long smpi_rastro_timestamp ()
420 double now = SIMIX_get_clock();
422 unsigned long long sec = (unsigned long long)now;
423 unsigned long long pre = (now - sec) * smpi_rastro_resolution();
425 return static_cast<unsigned long long>(sec) * smpi_rastro_resolution() + pre;
428 /* ****************************** Functions related to the SMPI_SAMPLE_ macros ************************************/
430 double threshold; /* maximal stderr requested (if positive) */
431 double relstderr; /* observed stderr so far */
432 double mean; /* mean of benched times, to be used if the block is disabled */
433 double sum; /* sum of benched times (to compute the mean and stderr) */
434 double sum_pow2; /* sum of the square of the benched times (to compute the stderr) */
435 int iters; /* amount of requested iterations */
436 int count; /* amount of iterations done so far */
437 int benching; /* 1: we are benchmarking; 0: we have enough data, no bench anymore */
440 static char *sample_location(int global, const char *file, int line) {
442 return bprintf("%s:%d", file, line);
444 return bprintf("%s:%d:%d", file, line, smpi_process_index());
448 static int sample_enough_benchs(local_data_t *data) {
449 int res = data->count >= data->iters;
450 if (data->threshold>0.0) {
452 res = 0; // not enough data
453 if (data->relstderr > data->threshold)
454 res = 0; // stderr too high yet
456 XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
457 (res?"enough benchs":"need more data"), data->count, data->iters, data->relstderr, data->threshold, data->mean);
461 void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
463 char *loc = sample_location(global, file, line);
466 smpi_bench_end(); /* Take time from previous, unrelated computation into account */
467 smpi_process_set_sampling(1);
469 if (samples==nullptr)
470 samples = xbt_dict_new_homogeneous(free);
472 data = static_cast<local_data_t *>(xbt_dict_get_or_null(samples, loc));
474 xbt_assert(threshold>0 || iters>0,
475 "You should provide either a positive amount of iterations to bench, or a positive maximal stderr (or both)");
476 data = static_cast<local_data_t *>( xbt_new(local_data_t, 1));
479 data->sum_pow2 = 0.0;
481 data->threshold = threshold;
482 data->benching = 1; // If we have no data, we need at least one
484 xbt_dict_set(samples, loc, data, nullptr);
485 XBT_DEBUG("XXXXX First time ever on benched nest %s.",loc);
487 if (data->iters != iters || data->threshold != threshold) {
488 XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. "
489 "How did you manage to give two numbers at the same line??",
490 loc, data->iters, data->threshold, iters,threshold);
494 // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate
495 // the computation instead
496 data->benching = (sample_enough_benchs(data) == 0);
497 XBT_DEBUG("XXXX Re-entering the benched nest %s. %s",loc,
498 (data->benching?"more benching needed":"we have enough data, skip computes"));
503 int smpi_sample_2(int global, const char *file, int line)
505 char *loc = sample_location(global, file, line);
509 xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
510 data = static_cast<local_data_t *>(xbt_dict_get(samples, loc));
511 XBT_DEBUG("sample2 %s",loc);
514 if (data->benching==1) {
515 // we need to run a new bench
516 XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f",
517 data->count, data->iters, data->relstderr, data->threshold, data->mean);
520 // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just
521 //ran one bench and need to bail out now that our job is done). Just sleep instead
522 XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f)."
523 " apply the %fs delay instead", data->count, data->iters, data->relstderr, data->threshold, data->mean);
524 smpi_execute(data->mean);
525 smpi_process_set_sampling(0);
526 res = 0; // prepare to capture future, unrelated computations
532 void smpi_sample_3(int global, const char *file, int line)
534 char *loc = sample_location(global, file, line);
537 xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
538 data = static_cast<local_data_t *>(xbt_dict_get(samples, loc));
539 XBT_DEBUG("sample3 %s",loc);
542 if (data->benching==0) {
546 // ok, benchmarking this loop is over
547 xbt_os_threadtimer_stop(smpi_process_timer());
552 sample = xbt_os_timer_elapsed(smpi_process_timer());
554 data->sum_pow2 += sample * sample;
555 n = static_cast<double>(data->count);
556 data->mean = data->sum / n;
557 data->relstderr = sqrt((data->sum_pow2 / n - data->mean * data->mean) / n) / data->mean;
558 if (sample_enough_benchs(data)==0) {
559 data->mean = sample; // Still in benching process; We want sample_2 to simulate the exact time of this loop
560 // occurrence before leaving, not the mean over the history
562 XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)", data->count,
563 data->mean, data->relstderr, sample);
565 // That's enough for now, prevent sample_2 to run the same code over and over
571 void *smpi_shared_malloc(size_t size, const char *file, int line)
574 if (size > 0 && xbt_cfg_get_boolean("smpi/use-shared-malloc")){
576 smpi_source_location loc(file, line);
577 auto res = allocs.insert(std::make_pair(loc, shared_data_t()));
578 auto data = res.first;
580 // The insertion did not take place.
581 // Generate a shared memory name from the address of the shared_data:
582 char shmname[32]; // cannot be longer than PSHMNAMLEN = 31 on Mac OS X (shm_open raises ENAMETOOLONG otherwise)
583 snprintf(shmname, 31, "/shmalloc%p", &*data);
584 fd = shm_open(shmname, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
587 xbt_die("Please cleanup /dev/shm/%s", shmname);
589 xbt_die("An unhandled error occurred while opening %s. shm_open: %s", shmname, strerror(errno));
591 data->second.fd = fd;
592 data->second.count = 1;
593 mem = shm_map(fd, size, &*data);
594 if (shm_unlink(shmname) < 0) {
595 XBT_WARN("Could not early unlink %s. shm_unlink: %s", shmname, strerror(errno));
597 XBT_DEBUG("Mapping %s at %p through %d", shmname, mem, fd);
599 mem = shm_map(data->second.fd, size, &*data);
600 data->second.count++;
602 XBT_DEBUG("Shared malloc %zu in %p (metadata at %p)", size, mem, &*data);
604 mem = xbt_malloc(size);
605 XBT_DEBUG("Classic malloc %zu in %p", size, mem);
611 void smpi_shared_free(void *ptr)
613 char loc[PTR_STRLEN];
615 if (xbt_cfg_get_boolean("smpi/use-shared-malloc")){
616 snprintf(loc, PTR_STRLEN, "%p", ptr);
617 auto meta = allocs_metadata.find(ptr);
618 if (meta == allocs_metadata.end()) {
619 XBT_WARN("Cannot free: %p was not shared-allocated by SMPI - maybe its size was 0?", ptr);
622 shared_data_t* data = &meta->second.data->second;
623 if (munmap(ptr, meta->second.size) < 0) {
624 XBT_WARN("Unmapping of fd %d failed: %s", data->fd, strerror(errno));
627 if (data->count <= 0) {
629 allocs.erase(allocs.find(meta->second.data->first));
630 XBT_DEBUG("Shared free - with removal - of %p", ptr);
632 XBT_DEBUG("Shared free - no removal - of %p, count = %d", ptr, data->count);
635 XBT_DEBUG("Classic free of %p", ptr);
641 int smpi_shared_known_call(const char* func, const char* input)
643 char* loc = bprintf("%s:%s", func, input);
646 if (calls==nullptr) {
647 calls = xbt_dict_new_homogeneous(nullptr);
650 xbt_dict_get(calls, loc); /* Succeed or throw */
656 if (ex.category != not_found_error)
666 void* smpi_shared_get_call(const char* func, const char* input) {
667 char* loc = bprintf("%s:%s", func, input);
671 calls = xbt_dict_new_homogeneous(nullptr);
673 data = xbt_dict_get(calls, loc);
678 void* smpi_shared_set_call(const char* func, const char* input, void* data) {
679 char* loc = bprintf("%s:%s", func, input);
682 calls = xbt_dict_new_homogeneous(nullptr);
684 xbt_dict_set(calls, loc, data, nullptr);
690 /** Map a given SMPI privatization segment (make a SMPI process active) */
691 void smpi_switch_data_segment(int dest) {
692 if (smpi_loaded_page == dest)//no need to switch, we've already loaded the one we want
696 smpi_really_switch_data_segment(dest);
699 /** Map a given SMPI privatization segment (make a SMPI process active) even if SMPI thinks it is already active
701 * When doing a state restoration, the state of the restored variables might not be consistent with the state of the
702 * virtual memory. In this case, we to change the data segment.
704 void smpi_really_switch_data_segment(int dest) {
705 if(smpi_size_data_exe == 0)//no need to switch
708 #if HAVE_PRIVATIZATION
709 if(smpi_loaded_page==-1){//initial switch, do the copy from the real page here
710 for (int i=0; i< smpi_process_count(); i++){
711 memcpy(smpi_privatisation_regions[i].address, TOPAGE(smpi_start_data_exe), smpi_size_data_exe);
715 // FIXME, cross-process support (mmap across process when necessary)
716 int current = smpi_privatisation_regions[dest].file_descriptor;
717 XBT_DEBUG("Switching data frame to the one of process %d", dest);
718 void* tmp = mmap (TOPAGE(smpi_start_data_exe), smpi_size_data_exe,
719 PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, current, 0);
720 if (tmp != TOPAGE(smpi_start_data_exe))
721 xbt_die("Couldn't map the new region");
722 smpi_loaded_page = dest;
726 int smpi_is_privatisation_file(char* file)
728 return strncmp("/dev/shm/my-buffer-", file, std::strlen("/dev/shm/my-buffer-")) == 0;
731 void smpi_initialize_global_memory_segments(){
733 #if !HAVE_PRIVATIZATION
734 smpi_privatize_global_variables=false;
735 xbt_die("You are trying to use privatization on a system that does not support it. Don't.");
739 smpi_get_executable_global_size();
741 XBT_DEBUG ("bss+data segment found : size %d starting at %p", smpi_size_data_exe, smpi_start_data_exe );
743 if (smpi_size_data_exe == 0){//no need to switch
744 smpi_privatize_global_variables=false;
748 smpi_privatisation_regions =
749 static_cast<smpi_privatisation_region_t>( xbt_malloc(smpi_process_count() * sizeof(struct s_smpi_privatisation_region)));
751 for (int i=0; i< smpi_process_count(); i++){
752 //create SIMIX_process_count() mappings of this size with the same data inside
754 void *address = nullptr;
759 snprintf(path, sizeof(path), "/smpi-buffer-%06x", rand()%0xffffff);
760 file_descriptor = shm_open(path, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
761 } while (file_descriptor == -1 && errno == EEXIST);
762 if (file_descriptor < 0) {
764 xbt_die("Impossible to create temporary file for memory mapping: %s\n\
765 The open() system call failed with the EMFILE error code (too many files). \n\n\
766 This means that you reached the system limits concerning the amount of files per process. \
767 This is not a surprise if you are trying to virtualize many processes on top of SMPI. \
768 Don't panic -- you should simply increase your system limits and try again. \n\n\
769 First, check what your limits are:\n\
770 cat /proc/sys/fs/file-max # Gives you the system-wide limit\n\
771 ulimit -Hn # Gives you the per process hard limit\n\
772 ulimit -Sn # Gives you the per process soft limit\n\
773 cat /proc/self/limits # Displays any per-process limitation (including the one given above)\n\n\
774 If one of these values is less than the amount of MPI processes that you try to run, then you got the explanation of this error. \
775 Ask the Internet about tutorials on how to increase the files limit such as: https://rtcamp.com/tutorials/linux/increase-open-files-limit/",
778 xbt_die("Impossible to create temporary file for memory mapping: %s",
782 status = ftruncate(file_descriptor, smpi_size_data_exe);
784 xbt_die("Impossible to set the size of the temporary file for memory mapping");
786 /* Ask for a free region */
787 address = mmap (nullptr, smpi_size_data_exe, PROT_READ | PROT_WRITE, MAP_SHARED, file_descriptor, 0);
788 if (address == MAP_FAILED)
789 xbt_die("Couldn't find a free region for memory mapping");
791 status = shm_unlink(path);
793 xbt_die("Impossible to unlink temporary file for memory mapping");
795 //initialize the values
796 memcpy(address, TOPAGE(smpi_start_data_exe), smpi_size_data_exe);
798 //store the address of the mapping for further switches
799 smpi_privatisation_regions[i].file_descriptor = file_descriptor;
800 smpi_privatisation_regions[i].address = address;
805 void smpi_destroy_global_memory_segments(){
806 if (smpi_size_data_exe == 0)//no need to switch
808 #if HAVE_PRIVATIZATION
810 for (i=0; i< smpi_process_count(); i++){
811 if(munmap(smpi_privatisation_regions[i].address, smpi_size_data_exe) < 0) {
812 XBT_WARN("Unmapping of fd %d failed: %s", smpi_privatisation_regions[i].file_descriptor, strerror(errno));
814 close(smpi_privatisation_regions[i].file_descriptor);
816 xbt_free(smpi_privatisation_regions);
820 extern "C" { /** These functions will be called from the user code **/
821 smpi_trace_call_location_t* smpi_trace_get_call_location() {
822 return smpi_process_get_call_location();
825 void smpi_trace_set_call_location(const char* file, const int line) {
826 smpi_trace_call_location_t* loc = smpi_process_get_call_location();
828 loc->previous_filename = loc->filename;
829 loc->previous_linenumber = loc->linenumber;
830 loc->filename = file;
831 loc->linenumber = line;
835 * Required for Fortran bindings
837 void smpi_trace_set_call_location_(const char* file, int* line) {
838 smpi_trace_set_call_location(file, *line);
842 * Required for Fortran if -fsecond-underscore is activated
844 void smpi_trace_set_call_location__(const char* file, int* line) {
845 smpi_trace_set_call_location(file, *line);