1 /* Copyright (c) 2007-2020. 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 "simgrid/host.h"
9 #include "simgrid/modelchecker.h"
10 #include "simgrid/s4u/Exec.hpp"
11 #include "smpi_comm.hpp"
12 #include "src/internal_config.h"
13 #include "src/mc/mc_replay.hpp"
14 #include "xbt/config.hpp"
15 #include "xbt/file.hpp"
17 #include "src/smpi/include/smpi_actor.hpp"
18 #include <unordered_map>
29 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_bench, smpi, "Logging specific to SMPI (benchmarking)");
31 static simgrid::config::Flag<double>
32 smpi_wtime_sleep("smpi/wtime",
33 "Minimum time to inject inside a call to MPI_Wtime(), gettimeofday() and clock_gettime()",
34 1e-8 /* Documented to be 10 ns */);
36 double smpi_total_benched_time = 0;
38 // Private execute_flops used by smpi_execute and smpi_execute_benched
39 void private_execute_flops(double flops) {
40 xbt_assert(flops >= 0, "You're trying to execute a negative amount of flops (%f)!", flops);
41 XBT_DEBUG("Handle real computation time: %f flops", flops);
42 simgrid::s4u::this_actor::exec_init(flops)
43 ->set_name("computation")
44 ->set_tracing_category(smpi_process()->get_tracing_category())
47 smpi_switch_data_segment(simgrid::s4u::Actor::self());
50 void smpi_execute_flops(double flops)
52 private_execute_flops(flops);
55 void smpi_execute(double duration)
57 if (duration >= smpi_cfg_cpu_thresh()) {
58 XBT_DEBUG("Sleep for %g to handle real computation time", duration);
59 private_execute_flops(duration * smpi_cfg_host_speed());
61 XBT_DEBUG("Real computation took %g while option smpi/cpu-threshold is set to %g => ignore it", duration,
62 smpi_cfg_cpu_thresh());
66 void smpi_execute_benched(double duration)
69 double speed = sg_host_speed(sg_host_self());
70 smpi_execute_flops(duration*speed);
74 void smpi_execute_flops_benched(double flops) {
76 smpi_execute_flops(flops);
80 void smpi_bench_begin()
82 if (smpi_cfg_privatization() == SmpiPrivStrategies::MMAP) {
83 smpi_switch_data_segment(simgrid::s4u::Actor::self());
86 if (MC_is_active() || MC_record_replay_is_active())
90 if (not smpi_cfg_papi_events_file().empty()) {
91 int event_set = smpi_process()->papi_event_set();
92 // PAPI_start sets everything to 0! See man(3) PAPI_start
93 if (PAPI_LOW_LEVEL_INITED == PAPI_is_initialized() && PAPI_start(event_set) != PAPI_OK) {
94 // TODO This needs some proper handling.
95 XBT_CRITICAL("Could not start PAPI counters.\n");
100 xbt_os_threadtimer_start(smpi_process()->timer());
103 double smpi_adjust_comp_speed(){
105 if (smpi_cfg_comp_adjustment_file()[0] != '\0') {
106 smpi_trace_call_location_t* loc = smpi_process()->call_location();
107 std::string key = loc->get_composed_key();
108 std::unordered_map<std::string, double>::const_iterator it = location2speedup.find(key);
109 if (it != location2speedup.end()) {
110 speedup = it->second;
116 void smpi_bench_end()
118 if (MC_is_active() || MC_record_replay_is_active())
121 xbt_os_timer_t timer = smpi_process()->timer();
122 xbt_os_threadtimer_stop(timer);
126 * An MPI function has been called and now is the right time to update
127 * our PAPI counters for this process.
129 if (not smpi_cfg_papi_events_file().empty()) {
130 papi_counter_t& counter_data = smpi_process()->papi_counters();
131 int event_set = smpi_process()->papi_event_set();
132 std::vector<long long> event_values = std::vector<long long>(counter_data.size());
134 if (PAPI_stop(event_set, &event_values[0]) != PAPI_OK) { // Error
135 XBT_CRITICAL("Could not stop PAPI counters.\n");
138 for (unsigned int i = 0; i < counter_data.size(); i++) {
139 counter_data[i].second += event_values[i];
145 if (smpi_process()->sampling()) {
146 XBT_CRITICAL("Cannot do recursive benchmarks.");
147 XBT_CRITICAL("Are you trying to make a call to MPI within a SMPI_SAMPLE_ block?");
148 xbt_backtrace_display_current();
149 xbt_die("Aborting.");
152 // Maybe we need to artificially speed up or slow down our computation based on our statistical analysis.
153 // Simulate the benchmarked computation unless disabled via command-line argument
154 if (smpi_cfg_simulate_computation()) {
155 smpi_execute(xbt_os_timer_elapsed(timer)/smpi_adjust_comp_speed());
159 if (not smpi_cfg_papi_events_file().empty() && TRACE_smpi_is_enabled()) {
160 const simgrid::instr::Container* container =
161 simgrid::instr::Container::by_name(std::string("rank-") + std::to_string(simgrid::s4u::this_actor::get_pid()));
162 const papi_counter_t& counter_data = smpi_process()->papi_counters();
164 for (auto const& pair : counter_data) {
165 simgrid::instr::VariableType* variable = static_cast<simgrid::instr::VariableType*>(container->type_->by_name(pair.first));
166 variable->set_event(SIMIX_get_clock(), pair.second);
171 smpi_total_benched_time += xbt_os_timer_elapsed(timer);
174 /* Private sleep function used by smpi_sleep(), smpi_usleep() and friends */
175 static unsigned int private_sleep(double secs)
179 XBT_DEBUG("Sleep for: %lf secs", secs);
180 int rank = simgrid::s4u::this_actor::get_pid();
181 TRACE_smpi_sleeping_in(rank, secs);
183 simgrid::s4u::this_actor::sleep_for(secs);
185 TRACE_smpi_sleeping_out(rank);
191 unsigned int smpi_sleep(unsigned int secs)
193 if (not smpi_process())
195 return private_sleep(secs);
198 int smpi_usleep(useconds_t usecs)
200 if (not smpi_process())
201 return usleep(usecs);
202 return static_cast<int>(private_sleep(usecs / 1000000.0));
205 #if _POSIX_TIMERS > 0
206 int smpi_nanosleep(const struct timespec* tp, struct timespec* t)
208 if (not smpi_process())
209 return nanosleep(tp,t);
210 return static_cast<int>(private_sleep(tp->tv_sec + tp->tv_nsec / 1000000000.0));
214 int smpi_gettimeofday(struct timeval* tv, struct timezone* tz)
216 if (not smpi_process())
217 return gettimeofday(tv, tz);
220 double now = SIMIX_get_clock();
222 tv->tv_sec = static_cast<time_t>(now);
224 tv->tv_usec = static_cast<useconds_t>((now - tv->tv_sec) * 1e6);
226 tv->tv_usec = static_cast<suseconds_t>((now - tv->tv_sec) * 1e6);
229 if (smpi_wtime_sleep > 0)
230 simgrid::s4u::this_actor::sleep_for(smpi_wtime_sleep);
235 #if _POSIX_TIMERS > 0
236 int smpi_clock_gettime(clockid_t clk_id, struct timespec* tp)
238 if (not smpi_process())
239 return clock_gettime(clk_id, tp);
240 //there is only one time in SMPI, so clk_id is ignored.
242 double now = SIMIX_get_clock();
244 tp->tv_sec = static_cast<time_t>(now);
245 tp->tv_nsec = static_cast<long int>((now - tp->tv_sec) * 1e9);
247 if (smpi_wtime_sleep > 0)
248 simgrid::s4u::this_actor::sleep_for(smpi_wtime_sleep);
254 double smpi_mpi_wtime()
257 if (smpi_process()->initialized() && not smpi_process()->finalized() && not smpi_process()->sampling()) {
259 time = SIMIX_get_clock();
260 if (smpi_wtime_sleep > 0)
261 simgrid::s4u::this_actor::sleep_for(smpi_wtime_sleep);
264 time = SIMIX_get_clock();
269 extern double sg_surf_precision;
270 unsigned long long smpi_rastro_resolution ()
273 double resolution = (1/sg_surf_precision);
275 return static_cast<unsigned long long>(resolution);
278 unsigned long long smpi_rastro_timestamp ()
281 double now = SIMIX_get_clock();
283 unsigned long long sec = static_cast<unsigned long long>(now);
284 unsigned long long pre = (now - sec) * smpi_rastro_resolution();
286 return static_cast<unsigned long long>(sec) * smpi_rastro_resolution() + pre;
289 /* ****************************** Functions related to the SMPI_SAMPLE_ macros ************************************/
291 class SampleLocation : public std::string {
293 SampleLocation(bool global, const char* file, int line) : std::string(std::string(file) + ":" + std::to_string(line))
296 this->append(":" + std::to_string(simgrid::s4u::this_actor::get_pid()));
302 double threshold; /* maximal stderr requested (if positive) */
303 double relstderr; /* observed stderr so far */
304 double mean; /* mean of benched times, to be used if the block is disabled */
305 double sum; /* sum of benched times (to compute the mean and stderr) */
306 double sum_pow2; /* sum of the square of the benched times (to compute the stderr) */
307 int iters; /* amount of requested iterations */
308 int count; /* amount of iterations done so far */
309 bool benching; /* true: we are benchmarking; false: we have enough data, no bench anymore */
311 bool need_more_benchs() const;
314 bool LocalData::need_more_benchs() const
316 bool res = (count < iters) || (threshold > 0.0 && (count < 2 || // not enough data
317 relstderr > threshold // stderr too high yet
319 XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
320 (res ? "need more data" : "enough benchs"), count, iters, relstderr, threshold, mean);
324 std::unordered_map<SampleLocation, LocalData, std::hash<std::string>> samples;
327 void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
329 SampleLocation loc(global, file, line);
330 if (not smpi_process()->sampling()) { /* Only at first call when benchmarking, skip for next ones */
331 smpi_bench_end(); /* Take time from previous, unrelated computation into account */
332 smpi_process()->set_sampling(1);
335 auto insert = samples.emplace(loc, LocalData{
336 threshold, // threshold
343 true // benching (if we have no data, we need at least one)
346 XBT_DEBUG("XXXXX First time ever on benched nest %s.", loc.c_str());
347 xbt_assert(threshold > 0 || iters > 0,
348 "You should provide either a positive amount of iterations to bench, or a positive maximal stderr (or both)");
350 LocalData& data = insert.first->second;
351 if (data.iters != iters || data.threshold != threshold) {
352 XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. "
353 "How did you manage to give two numbers at the same line??",
354 loc.c_str(), data.iters, data.threshold, iters, threshold);
358 // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate
359 // the computation instead
360 data.benching = data.need_more_benchs();
361 XBT_DEBUG("XXXX Re-entering the benched nest %s. %s", loc.c_str(),
362 (data.benching ? "more benching needed" : "we have enough data, skip computes"));
366 int smpi_sample_2(int global, const char *file, int line, int iter_count)
368 SampleLocation loc(global, file, line);
370 XBT_DEBUG("sample2 %s %d", loc.c_str(), iter_count);
371 auto sample = samples.find(loc);
372 if (sample == samples.end())
373 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
374 const LocalData& data = sample->second;
377 // we need to run a new bench
378 XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f; total:%f",
379 data.count, data.iters, data.relstderr, data.threshold, data.mean, data.sum);
382 // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just
383 //ran one bench and need to bail out now that our job is done). Just sleep instead
384 if (not data.need_more_benchs()){
385 XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f). "
386 "Mean is %f, will be injected %d times",
387 data.count, data.iters, data.relstderr, data.threshold, data.mean, iter_count);
389 //we ended benchmarking, let's inject all the time, now, and fast forward out of the loop.
390 smpi_process()->set_sampling(0);
391 smpi_execute(data.mean*iter_count);
395 XBT_DEBUG("Skipping - Benchmark already performed - accumulating time");
396 xbt_os_threadtimer_start(smpi_process()->timer());
402 void smpi_sample_3(int global, const char *file, int line)
404 SampleLocation loc(global, file, line);
406 XBT_DEBUG("sample3 %s", loc.c_str());
407 auto sample = samples.find(loc);
408 if (sample == samples.end())
409 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
410 LocalData& data = sample->second;
412 if (not data.benching)
415 // ok, benchmarking this loop is over
416 xbt_os_threadtimer_stop(smpi_process()->timer());
420 double period = xbt_os_timer_elapsed(smpi_process()->timer());
422 data.sum_pow2 += period * period;
423 double n = data.count;
424 data.mean = data.sum / n;
425 data.relstderr = sqrt((data.sum_pow2 / n - data.mean * data.mean) / n) / data.mean;
427 XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)",
428 data.count, data.mean, data.relstderr, period);
430 // That's enough for now, prevent sample_2 to run the same code over and over
431 data.benching = false;
434 int smpi_sample_exit(int global, const char *file, int line, int iter_count){
435 if (smpi_process()->sampling()){
436 SampleLocation loc(global, file, line);
438 XBT_DEBUG("sample exit %s", loc.c_str());
439 auto sample = samples.find(loc);
440 if (sample == samples.end())
441 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
443 if (smpi_process()->sampling()){//end of loop, but still sampling needed
444 const LocalData& data = sample->second;
445 smpi_process()->set_sampling(0);
446 smpi_execute(data.mean * iter_count);
453 smpi_trace_call_location_t* smpi_trace_get_call_location()
455 return smpi_process()->call_location();
458 void smpi_trace_set_call_location(const char* file, const int line)
460 smpi_trace_call_location_t* loc = smpi_process()->call_location();
462 loc->previous_filename = loc->filename;
463 loc->previous_linenumber = loc->linenumber;
464 if(not smpi_cfg_trace_call_use_absolute_path())
465 loc->filename = simgrid::xbt::Path(file).get_base_name();
467 loc->filename = file;
468 loc->linenumber = line;
471 /** Required for Fortran bindings */
472 void smpi_trace_set_call_location_(const char* file, const int* line)
474 smpi_trace_set_call_location(file, *line);
477 /** Required for Fortran if -fsecond-underscore is activated */
478 void smpi_trace_set_call_location__(const char* file, const int* line)
480 smpi_trace_set_call_location(file, *line);
483 void smpi_bench_destroy()
488 int smpi_getopt_long_only (int argc, char *const *argv, const char *options,
489 const struct option * long_options, int *opt_index)
492 optind = smpi_process()->get_optind();
493 int ret = getopt_long_only (argc, argv, options, long_options, opt_index);
495 smpi_process()->set_optind(optind);
499 int smpi_getopt_long (int argc, char *const *argv, const char *options,
500 const struct option * long_options, int *opt_index)
503 optind = smpi_process()->get_optind();
504 int ret = getopt_long (argc, argv, options, long_options, opt_index);
506 smpi_process()->set_optind(optind);
510 int smpi_getopt (int argc, char *const *argv, const char *options)
513 optind = smpi_process()->get_optind();
514 int ret = getopt (argc, argv, options);
516 smpi_process()->set_optind(optind);