1 /* Copyright (c) 2007-2018. 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 "src/simix/ActorImpl.hpp"
15 #include "xbt/config.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 double smpi_cpu_threshold = -1;
32 double smpi_host_speed;
34 SharedMallocType smpi_cfg_shared_malloc = SharedMallocType::GLOBAL;
35 double smpi_total_benched_time = 0;
37 extern "C" XBT_PUBLIC void smpi_execute_flops_(double* flops);
38 void smpi_execute_flops_(double *flops)
40 smpi_execute_flops(*flops);
43 extern "C" XBT_PUBLIC void smpi_execute_(double* duration);
44 void smpi_execute_(double *duration)
46 smpi_execute(*duration);
49 void smpi_execute_flops(double flops) {
50 xbt_assert(flops >= 0, "You're trying to execute a negative amount of flops (%f)!", flops);
51 XBT_DEBUG("Handle real computation time: %f flops", flops);
52 simgrid::s4u::ExecPtr e = simgrid::s4u::this_actor::exec_init(flops)->set_name("computation");
54 e->set_tracing_category(TRACE_internal_smpi_get_category());
56 smpi_switch_data_segment(simgrid::s4u::Actor::self());
59 void smpi_execute(double duration)
61 if (duration >= smpi_cpu_threshold) {
62 XBT_DEBUG("Sleep for %g to handle real computation time", duration);
63 double flops = duration * smpi_host_speed;
64 int rank = simgrid::s4u::this_actor::get_pid();
65 TRACE_smpi_computing_in(rank, flops);
67 smpi_execute_flops(flops);
69 TRACE_smpi_computing_out(rank);
72 XBT_DEBUG("Real computation took %g while option smpi/cpu-threshold is set to %g => ignore it", duration,
77 void smpi_execute_benched(double duration)
80 double speed = sg_host_speed(sg_host_self());
81 smpi_execute_flops(duration*speed);
85 void smpi_bench_begin()
87 if (smpi_privatize_global_variables == SmpiPrivStrategies::MMAP) {
88 smpi_switch_data_segment(simgrid::s4u::Actor::self());
91 if (MC_is_active() || MC_record_replay_is_active())
95 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
96 int event_set = smpi_process()->papi_event_set();
97 // PAPI_start sets everything to 0! See man(3) PAPI_start
98 if (PAPI_LOW_LEVEL_INITED == PAPI_is_initialized()) {
99 if (PAPI_start(event_set) != PAPI_OK) {
100 // TODO This needs some proper handling.
101 XBT_CRITICAL("Could not start PAPI counters.\n");
107 xbt_os_threadtimer_start(smpi_process()->timer());
110 void smpi_bench_end()
112 if (MC_is_active() || MC_record_replay_is_active())
116 xbt_os_timer_t timer = smpi_process()->timer();
117 xbt_os_threadtimer_stop(timer);
121 * An MPI function has been called and now is the right time to update
122 * our PAPI counters for this process.
124 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty()) {
125 papi_counter_t& counter_data = smpi_process()->papi_counters();
126 int event_set = smpi_process()->papi_event_set();
127 std::vector<long long> event_values = std::vector<long long>(counter_data.size());
129 if (PAPI_stop(event_set, &event_values[0]) != PAPI_OK) { // Error
130 XBT_CRITICAL("Could not stop PAPI counters.\n");
133 for (unsigned int i = 0; i < counter_data.size(); i++) {
134 counter_data[i].second += event_values[i];
140 if (smpi_process()->sampling()) {
141 XBT_CRITICAL("Cannot do recursive benchmarks.");
142 XBT_CRITICAL("Are you trying to make a call to MPI within a SMPI_SAMPLE_ block?");
143 xbt_backtrace_display_current();
144 xbt_die("Aborting.");
147 // Maybe we need to artificially speed up or slow down our computation based on our statistical analysis.
148 if (simgrid::config::get_value<std::string>("smpi/comp-adjustment-file")[0] != '\0') {
150 smpi_trace_call_location_t* loc = smpi_process()->call_location();
151 std::string key = loc->get_composed_key();
152 std::unordered_map<std::string, double>::const_iterator it = location2speedup.find(key);
153 if (it != location2speedup.end()) {
154 speedup = it->second;
158 // Simulate the benchmarked computation unless disabled via command-line argument
159 if (simgrid::config::get_value<bool>("smpi/simulate-computation")) {
160 smpi_execute(xbt_os_timer_elapsed(timer)/speedup);
164 if (not simgrid::config::get_value<std::string>("smpi/papi-events").empty() && TRACE_smpi_is_enabled()) {
165 container_t container =
166 simgrid::instr::Container::by_name(std::string("rank-") + std::to_string(simgrid::s4u::this_actor::get_pid()));
167 papi_counter_t& counter_data = smpi_process()->papi_counters();
169 for (auto const& pair : counter_data) {
170 simgrid::instr::VariableType* variable = static_cast<simgrid::instr::VariableType*>(container->type_->by_name(pair.first));
171 variable->set_event(SIMIX_get_clock(), pair.second);
176 smpi_total_benched_time += xbt_os_timer_elapsed(timer);
179 /* Private sleep function used by smpi_sleep() and smpi_usleep() */
180 static unsigned int private_sleep(double secs)
184 XBT_DEBUG("Sleep for: %lf secs", secs);
185 int rank = simgrid::s4u::this_actor::get_pid();
186 TRACE_smpi_sleeping_in(rank, secs);
188 simcall_process_sleep(secs);
190 TRACE_smpi_sleeping_out(rank);
196 unsigned int smpi_sleep(unsigned int secs)
198 if (not smpi_process())
200 return private_sleep(static_cast<double>(secs));
203 int smpi_usleep(useconds_t usecs)
205 if (not smpi_process())
206 return usleep(usecs);
207 return static_cast<int>(private_sleep(static_cast<double>(usecs) / 1000000.0));
210 #if _POSIX_TIMERS > 0
211 int smpi_nanosleep(const struct timespec* tp, struct timespec* t)
213 if (not smpi_process())
214 return nanosleep(tp,t);
215 return static_cast<int>(private_sleep(static_cast<double>(tp->tv_sec + tp->tv_nsec / 1000000000.0)));
219 int smpi_gettimeofday(struct timeval* tv, struct timezone* tz)
221 if (not smpi_process())
222 return gettimeofday(tv, tz);
225 double now = SIMIX_get_clock();
227 tv->tv_sec = static_cast<time_t>(now);
229 tv->tv_usec = static_cast<useconds_t>((now - tv->tv_sec) * 1e6);
231 tv->tv_usec = static_cast<suseconds_t>((now - tv->tv_sec) * 1e6);
238 #if _POSIX_TIMERS > 0
239 int smpi_clock_gettime(clockid_t clk_id, struct timespec* tp)
241 if (not smpi_process())
242 return clock_gettime(clk_id, tp);
243 //there is only one time in SMPI, so clk_id is ignored.
245 double now = SIMIX_get_clock();
247 tp->tv_sec = static_cast<time_t>(now);
248 tp->tv_nsec = static_cast<long int>((now - tp->tv_sec) * 1e9);
255 extern double sg_surf_precision;
256 unsigned long long smpi_rastro_resolution ()
259 double resolution = (1/sg_surf_precision);
261 return static_cast<unsigned long long>(resolution);
264 unsigned long long smpi_rastro_timestamp ()
267 double now = SIMIX_get_clock();
269 unsigned long long sec = static_cast<unsigned long long>(now);
270 unsigned long long pre = (now - sec) * smpi_rastro_resolution();
272 return static_cast<unsigned long long>(sec) * smpi_rastro_resolution() + pre;
275 /* ****************************** Functions related to the SMPI_SAMPLE_ macros ************************************/
277 class SampleLocation : public std::string {
279 SampleLocation(bool global, const char* file, int line) : std::string(std::string(file) + ":" + std::to_string(line))
282 this->append(":" + std::to_string(simgrid::s4u::this_actor::get_pid()));
288 double threshold; /* maximal stderr requested (if positive) */
289 double relstderr; /* observed stderr so far */
290 double mean; /* mean of benched times, to be used if the block is disabled */
291 double sum; /* sum of benched times (to compute the mean and stderr) */
292 double sum_pow2; /* sum of the square of the benched times (to compute the stderr) */
293 int iters; /* amount of requested iterations */
294 int count; /* amount of iterations done so far */
295 bool benching; /* true: we are benchmarking; false: we have enough data, no bench anymore */
297 bool need_more_benchs() const;
300 bool LocalData::need_more_benchs() const
302 bool res = (count < iters) || (threshold > 0.0 && (count < 2 || // not enough data
303 relstderr > threshold // stderr too high yet
305 XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
306 (res ? "need more data" : "enough benchs"), count, iters, relstderr, threshold, mean);
310 std::unordered_map<SampleLocation, LocalData, std::hash<std::string>> samples;
313 void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
315 SampleLocation loc(global, file, line);
317 smpi_bench_end(); /* Take time from previous, unrelated computation into account */
318 smpi_process()->set_sampling(1);
320 auto insert = samples.emplace(loc, LocalData{
321 threshold, // threshold
328 true // benching (if we have no data, we need at least one)
330 LocalData& data = insert.first->second;
332 XBT_DEBUG("XXXXX First time ever on benched nest %s.", loc.c_str());
333 xbt_assert(threshold > 0 || iters > 0,
334 "You should provide either a positive amount of iterations to bench, or a positive maximal stderr (or both)");
336 if (data.iters != iters || data.threshold != threshold) {
337 XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. "
338 "How did you manage to give two numbers at the same line??",
339 loc.c_str(), data.iters, data.threshold, iters, threshold);
343 // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate
344 // the computation instead
345 data.benching = data.need_more_benchs();
346 XBT_DEBUG("XXXX Re-entering the benched nest %s. %s", loc.c_str(),
347 (data.benching ? "more benching needed" : "we have enough data, skip computes"));
351 int smpi_sample_2(int global, const char *file, int line)
353 SampleLocation loc(global, file, line);
356 XBT_DEBUG("sample2 %s", loc.c_str());
357 auto sample = samples.find(loc);
358 if (sample == samples.end())
359 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
360 LocalData& data = sample->second;
363 // we need to run a new bench
364 XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f",
365 data.count, data.iters, data.relstderr, data.threshold, data.mean);
368 // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just
369 //ran one bench and need to bail out now that our job is done). Just sleep instead
370 XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f)."
371 " apply the %fs delay instead",
372 data.count, data.iters, data.relstderr, data.threshold, data.mean);
373 smpi_execute(data.mean);
374 smpi_process()->set_sampling(0);
375 res = 0; // prepare to capture future, unrelated computations
381 void smpi_sample_3(int global, const char *file, int line)
383 SampleLocation loc(global, file, line);
385 XBT_DEBUG("sample3 %s", loc.c_str());
386 auto sample = samples.find(loc);
387 if (sample == samples.end())
388 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
389 LocalData& data = sample->second;
391 if (not data.benching)
394 // ok, benchmarking this loop is over
395 xbt_os_threadtimer_stop(smpi_process()->timer());
399 double period = xbt_os_timer_elapsed(smpi_process()->timer());
401 data.sum_pow2 += period * period;
402 double n = static_cast<double>(data.count);
403 data.mean = data.sum / n;
404 data.relstderr = sqrt((data.sum_pow2 / n - data.mean * data.mean) / n) / data.mean;
405 if (data.need_more_benchs()) {
406 data.mean = period; // Still in benching process; We want sample_2 to simulate the exact time of this loop
407 // occurrence before leaving, not the mean over the history
409 XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)",
410 data.count, data.mean, data.relstderr, period);
412 // That's enough for now, prevent sample_2 to run the same code over and over
413 data.benching = false;
416 smpi_trace_call_location_t* smpi_trace_get_call_location()
418 return smpi_process()->call_location();
421 void smpi_trace_set_call_location(const char* file, const int line)
423 smpi_trace_call_location_t* loc = smpi_process()->call_location();
425 loc->previous_filename = loc->filename;
426 loc->previous_linenumber = loc->linenumber;
427 loc->filename = file;
428 loc->linenumber = line;
431 /** Required for Fortran bindings */
432 void smpi_trace_set_call_location_(const char* file, int* line)
434 smpi_trace_set_call_location(file, *line);
437 /** Required for Fortran if -fsecond-underscore is activated */
438 void smpi_trace_set_call_location__(const char* file, int* line)
440 smpi_trace_set_call_location(file, *line);
443 void smpi_bench_destroy()
448 int smpi_getopt_long_only (int argc, char *const *argv, const char *options,
449 const struct option * long_options, int *opt_index)
452 optind = smpi_process()->get_optind();
453 int ret = getopt_long_only (argc, argv, options, long_options, opt_index);
455 smpi_process()->set_optind(optind);
459 int smpi_getopt_long (int argc, char *const *argv, const char *options,
460 const struct option * long_options, int *opt_index)
463 optind = smpi_process()->get_optind();
464 int ret = getopt_long (argc, argv, options, long_options, opt_index);
466 smpi_process()->set_optind(optind);
470 int smpi_getopt (int argc, char *const *argv, const char *options)
473 optind = smpi_process()->get_optind();
474 int ret = getopt (argc, argv, options);
476 smpi_process()->set_optind(optind);