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 "simgrid/modelchecker.h"
9 #include "smpi_comm.hpp"
10 #include "smpi_process.hpp"
11 #include "src/internal_config.h"
12 #include "src/mc/mc_replay.h"
13 #include <unordered_map>
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_bench, smpi, "Logging specific to SMPI (benchmarking)");
26 double smpi_cpu_threshold = -1;
27 double smpi_host_speed;
29 shared_malloc_type smpi_cfg_shared_malloc = shmalloc_global;
30 double smpi_total_benched_time = 0;
31 smpi_privatization_region_t smpi_privatization_regions;
33 extern "C" XBT_PUBLIC(void) smpi_execute_flops_(double *flops);
34 void smpi_execute_flops_(double *flops)
36 smpi_execute_flops(*flops);
39 extern "C" XBT_PUBLIC(void) smpi_execute_(double *duration);
40 void smpi_execute_(double *duration)
42 smpi_execute(*duration);
45 void smpi_execute_flops(double flops) {
46 XBT_DEBUG("Handle real computation time: %f flops", flops);
47 smx_activity_t action = simcall_execution_start("computation", flops, 1, 0);
48 simcall_set_category (action, TRACE_internal_smpi_get_category());
49 simcall_execution_wait(action);
50 smpi_switch_data_segment(smpi_process()->index());
53 void smpi_execute(double duration)
55 if (duration >= smpi_cpu_threshold) {
56 XBT_DEBUG("Sleep for %g to handle real computation time", duration);
57 double flops = duration * smpi_host_speed;
58 int rank = smpi_process()->index();
59 instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
60 extra->type=TRACING_COMPUTING;
61 extra->comp_size=flops;
62 TRACE_smpi_computing_in(rank, extra);
64 smpi_execute_flops(flops);
66 TRACE_smpi_computing_out(rank);
69 XBT_DEBUG("Real computation took %g while option smpi/cpu-threshold is set to %g => ignore it", duration,
74 void smpi_execute_benched(double duration)
77 smpi_execute(duration);
81 void smpi_bench_begin()
83 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) {
84 smpi_switch_data_segment(smpi_process()->index());
87 if (MC_is_active() || MC_record_replay_is_active())
91 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
92 int event_set = smpi_process()->papi_event_set();
93 // PAPI_start sets everything to 0! See man(3) PAPI_start
94 if (PAPI_LOW_LEVEL_INITED == PAPI_is_initialized()) {
95 if (PAPI_start(event_set) != PAPI_OK) {
96 // TODO This needs some proper handling.
97 XBT_CRITICAL("Could not start PAPI counters.\n");
103 xbt_os_threadtimer_start(smpi_process()->timer());
106 void smpi_bench_end()
108 if (MC_is_active() || MC_record_replay_is_active())
112 xbt_os_timer_t timer = smpi_process()->timer();
113 xbt_os_threadtimer_stop(timer);
117 * An MPI function has been called and now is the right time to update
118 * our PAPI counters for this process.
120 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
121 papi_counter_t& counter_data = smpi_process()->papi_counters();
122 int event_set = smpi_process()->papi_event_set();
123 std::vector<long long> event_values = std::vector<long long>(counter_data.size());
125 if (PAPI_stop(event_set, &event_values[0]) != PAPI_OK) { // Error
126 XBT_CRITICAL("Could not stop PAPI counters.\n");
129 for (unsigned int i = 0; i < counter_data.size(); i++) {
130 counter_data[i].second += event_values[i];
136 if (smpi_process()->sampling()) {
137 XBT_CRITICAL("Cannot do recursive benchmarks.");
138 XBT_CRITICAL("Are you trying to make a call to MPI within a SMPI_SAMPLE_ block?");
139 xbt_backtrace_display_current();
140 xbt_die("Aborting.");
143 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') { // Maybe we need to artificially speed up or slow
144 // down our computation based on our statistical analysis.
146 smpi_trace_call_location_t* loc = smpi_process()->call_location();
147 std::string key = loc->get_composed_key();
148 std::unordered_map<std::string, double>::const_iterator it = location2speedup.find(key);
149 if (it != location2speedup.end()) {
150 speedup = it->second;
154 // Simulate the benchmarked computation unless disabled via command-line argument
155 if (xbt_cfg_get_boolean("smpi/simulate-computation")) {
156 smpi_execute(xbt_os_timer_elapsed(timer)/speedup);
160 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0' && TRACE_smpi_is_enabled()) {
161 char container_name[INSTR_DEFAULT_STR_SIZE];
162 smpi_container(smpi_process()->index(), container_name, INSTR_DEFAULT_STR_SIZE);
163 container_t container = PJ_container_get(container_name);
164 papi_counter_t& counter_data = smpi_process()->papi_counters();
166 for (auto const& pair : counter_data) {
167 new_pajeSetVariable(surf_get_clock(), container,
168 PJ_type_get(/* countername */ pair.first.c_str(), container->type), pair.second);
173 smpi_total_benched_time += xbt_os_timer_elapsed(timer);
176 /* Private sleep function used by smpi_sleep() and smpi_usleep() */
177 static unsigned int private_sleep(double secs)
181 XBT_DEBUG("Sleep for: %lf secs", secs);
182 int rank = MPI_COMM_WORLD->rank();
183 instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
184 extra->type=TRACING_SLEEPING;
185 extra->sleep_duration=secs;
186 TRACE_smpi_sleeping_in(rank, extra);
188 simcall_process_sleep(secs);
190 TRACE_smpi_sleeping_out(rank);
196 unsigned int smpi_sleep(unsigned int secs)
198 return private_sleep(static_cast<double>(secs));
201 int smpi_usleep(useconds_t usecs)
203 return static_cast<int>(private_sleep(static_cast<double>(usecs) / 1000000.0));
206 #if _POSIX_TIMERS > 0
207 int smpi_nanosleep(const struct timespec *tp, struct timespec * t)
209 return static_cast<int>(private_sleep(static_cast<double>(tp->tv_sec + tp->tv_nsec / 1000000000.0)));
213 int smpi_gettimeofday(struct timeval *tv, void* tz)
216 double now = SIMIX_get_clock();
218 tv->tv_sec = static_cast<time_t>(now);
220 tv->tv_usec = static_cast<useconds_t>((now - tv->tv_sec) * 1e6);
222 tv->tv_usec = static_cast<suseconds_t>((now - tv->tv_sec) * 1e6);
229 #if _POSIX_TIMERS > 0
230 int smpi_clock_gettime(clockid_t clk_id, struct timespec *tp)
232 //there is only one time in SMPI, so clk_id is ignored.
234 double now = SIMIX_get_clock();
236 tp->tv_sec = static_cast<time_t>(now);
237 tp->tv_nsec = static_cast<long int>((now - tp->tv_sec) * 1e9);
244 extern double sg_surf_precision;
245 unsigned long long smpi_rastro_resolution ()
248 double resolution = (1/sg_surf_precision);
250 return static_cast<unsigned long long>(resolution);
253 unsigned long long smpi_rastro_timestamp ()
256 double now = SIMIX_get_clock();
258 unsigned long long sec = static_cast<unsigned long long>(now);
259 unsigned long long pre = (now - sec) * smpi_rastro_resolution();
261 return static_cast<unsigned long long>(sec) * smpi_rastro_resolution() + pre;
264 /* ****************************** Functions related to the SMPI_SAMPLE_ macros ************************************/
266 class SampleLocation : public std::string {
268 SampleLocation(bool global, const char* file, int line) : std::string(std::string(file) + ":" + std::to_string(line))
271 this->append(":" + std::to_string(smpi_process()->index()));
277 double threshold; /* maximal stderr requested (if positive) */
278 double relstderr; /* observed stderr so far */
279 double mean; /* mean of benched times, to be used if the block is disabled */
280 double sum; /* sum of benched times (to compute the mean and stderr) */
281 double sum_pow2; /* sum of the square of the benched times (to compute the stderr) */
282 int iters; /* amount of requested iterations */
283 int count; /* amount of iterations done so far */
284 bool benching; /* true: we are benchmarking; false: we have enough data, no bench anymore */
286 bool need_more_benchs() const;
290 std::unordered_map<SampleLocation, LocalData, std::hash<std::string>> samples;
292 bool LocalData::need_more_benchs() const
294 bool res = (count < iters) || (threshold > 0.0 && (count < 2 || // not enough data
295 relstderr > threshold // stderr too high yet
297 XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
298 (res ? "need more data" : "enough benchs"), count, iters, relstderr, threshold, mean);
302 void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
304 SampleLocation loc(global, file, line);
306 smpi_bench_end(); /* Take time from previous, unrelated computation into account */
307 smpi_process()->set_sampling(1);
309 auto insert = samples.emplace(loc, LocalData{
310 threshold, // threshold
317 true // benching (if we have no data, we need at least one)
319 LocalData& data = insert.first->second;
321 XBT_DEBUG("XXXXX First time ever on benched nest %s.", loc.c_str());
322 xbt_assert(threshold > 0 || iters > 0,
323 "You should provide either a positive amount of iterations to bench, or a positive maximal stderr (or both)");
325 if (data.iters != iters || data.threshold != threshold) {
326 XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. "
327 "How did you manage to give two numbers at the same line??",
328 loc.c_str(), data.iters, data.threshold, iters, threshold);
332 // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate
333 // the computation instead
334 data.benching = data.need_more_benchs();
335 XBT_DEBUG("XXXX Re-entering the benched nest %s. %s", loc.c_str(),
336 (data.benching ? "more benching needed" : "we have enough data, skip computes"));
340 int smpi_sample_2(int global, const char *file, int line)
342 SampleLocation loc(global, file, line);
345 XBT_DEBUG("sample2 %s", loc.c_str());
346 auto sample = samples.find(loc);
347 if (sample == samples.end())
348 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
349 LocalData& data = sample->second;
352 // we need to run a new bench
353 XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f",
354 data.count, data.iters, data.relstderr, data.threshold, data.mean);
357 // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just
358 //ran one bench and need to bail out now that our job is done). Just sleep instead
359 XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f)."
360 " apply the %fs delay instead",
361 data.count, data.iters, data.relstderr, data.threshold, data.mean);
362 smpi_execute(data.mean);
363 smpi_process()->set_sampling(0);
364 res = 0; // prepare to capture future, unrelated computations
370 void smpi_sample_3(int global, const char *file, int line)
372 SampleLocation loc(global, file, line);
374 XBT_DEBUG("sample3 %s", loc.c_str());
375 auto sample = samples.find(loc);
376 if (sample == samples.end())
377 xbt_die("Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
378 LocalData& data = sample->second;
380 if (not data.benching)
383 // ok, benchmarking this loop is over
384 xbt_os_threadtimer_stop(smpi_process()->timer());
388 double period = xbt_os_timer_elapsed(smpi_process()->timer());
390 data.sum_pow2 += period * period;
391 double n = static_cast<double>(data.count);
392 data.mean = data.sum / n;
393 data.relstderr = sqrt((data.sum_pow2 / n - data.mean * data.mean) / n) / data.mean;
394 if (data.need_more_benchs()) {
395 data.mean = period; // Still in benching process; We want sample_2 to simulate the exact time of this loop
396 // occurrence before leaving, not the mean over the history
398 XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)",
399 data.count, data.mean, data.relstderr, period);
401 // That's enough for now, prevent sample_2 to run the same code over and over
402 data.benching = false;
405 extern "C" { /** These functions will be called from the user code **/
406 smpi_trace_call_location_t* smpi_trace_get_call_location()
408 return smpi_process()->call_location();
411 void smpi_trace_set_call_location(const char* file, const int line)
413 smpi_trace_call_location_t* loc = smpi_process()->call_location();
415 loc->previous_filename = loc->filename;
416 loc->previous_linenumber = loc->linenumber;
417 loc->filename = file;
418 loc->linenumber = line;
421 /** Required for Fortran bindings */
422 void smpi_trace_set_call_location_(const char* file, int* line)
424 smpi_trace_set_call_location(file, *line);
427 /** Required for Fortran if -fsecond-underscore is activated */
428 void smpi_trace_set_call_location__(const char* file, int* line)
430 smpi_trace_set_call_location(file, *line);
434 void smpi_bench_destroy()