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. */
6 #include "src/internal_config.h"
9 #include "simgrid/modelchecker.h"
10 #include "src/mc/mc_replay.h"
11 #include "smpi_process.hpp"
12 #include "smpi_comm.hpp"
13 #include "simgrid/host.h"
18 #include <math.h> // sqrt
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_bench, smpi, "Logging specific to SMPI (benchmarking)");
27 xbt_dict_t samples = nullptr; /* Allocated on first use */
29 double smpi_cpu_threshold = -1;
30 double smpi_host_speed;
32 shared_malloc_type smpi_cfg_shared_malloc = shmalloc_global;
33 double smpi_total_benched_time = 0;
34 smpi_privatization_region_t smpi_privatization_regions;
36 void smpi_bench_destroy()
38 xbt_dict_free(&samples);
41 extern "C" XBT_PUBLIC(void) smpi_execute_flops_(double *flops);
42 void smpi_execute_flops_(double *flops)
44 smpi_execute_flops(*flops);
47 extern "C" XBT_PUBLIC(void) smpi_execute_(double *duration);
48 void smpi_execute_(double *duration)
50 smpi_execute(*duration);
53 void smpi_execute_flops(double flops) {
54 XBT_DEBUG("Handle real computation time: %f flops", flops);
55 smx_activity_t action = simcall_execution_start("computation", flops, 1, 0);
56 simcall_set_category (action, TRACE_internal_smpi_get_category());
57 simcall_execution_wait(action);
58 smpi_switch_data_segment(smpi_process()->index());
61 void smpi_execute(double duration)
63 if (duration >= smpi_cpu_threshold) {
64 XBT_DEBUG("Sleep for %g to handle real computation time", duration);
65 double flops = duration * smpi_host_speed;
66 int rank = smpi_process()->index();
67 instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
68 extra->type=TRACING_COMPUTING;
69 extra->comp_size=flops;
70 TRACE_smpi_computing_in(rank, extra);
72 smpi_execute_flops(flops);
74 TRACE_smpi_computing_out(rank);
77 XBT_DEBUG("Real computation took %g while option smpi/cpu_threshold is set to %g => ignore it", duration,
82 void smpi_execute_benched(double duration)
85 double speed = sg_host_speed(sg_host_self());
86 smpi_execute_flops(duration*speed);
90 void smpi_bench_begin()
92 if (smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) {
93 smpi_switch_data_segment(smpi_process()->index());
96 if (MC_is_active() || MC_record_replay_is_active())
100 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
101 int event_set = smpi_process()->papi_event_set();
102 // PAPI_start sets everything to 0! See man(3) PAPI_start
103 if (PAPI_LOW_LEVEL_INITED == PAPI_is_initialized()) {
104 if (PAPI_start(event_set) != PAPI_OK) {
105 // TODO This needs some proper handling.
106 XBT_CRITICAL("Could not start PAPI counters.\n");
112 xbt_os_threadtimer_start(smpi_process()->timer());
115 void smpi_bench_end()
117 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 (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
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];
140 // XBT_DEBUG("[%i] PAPI: Counter %s: Value is now %lli (got increment by %lli\n", smpi_process()->index(),
141 // counter_data[i].first.c_str(), counter_data[i].second, event_values[i]);
147 if (smpi_process()->sampling()) {
148 XBT_CRITICAL("Cannot do recursive benchmarks.");
149 XBT_CRITICAL("Are you trying to make a call to MPI within a SMPI_SAMPLE_ block?");
150 xbt_backtrace_display_current();
151 xbt_die("Aborting.");
154 if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') { // Maybe we need to artificially speed up or slow
155 // down our computation based on our statistical analysis.
157 smpi_trace_call_location_t* loc = smpi_process()->call_location();
158 std::string key = loc->get_composed_key();
159 std::unordered_map<std::string, double>::const_iterator it = location2speedup.find(key);
160 if (it != location2speedup.end()) {
161 speedup = it->second;
165 // Simulate the benchmarked computation unless disabled via command-line argument
166 if (xbt_cfg_get_boolean("smpi/simulate-computation")) {
167 smpi_execute(xbt_os_timer_elapsed(timer)/speedup);
171 if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0' && TRACE_smpi_is_enabled()) {
172 char container_name[INSTR_DEFAULT_STR_SIZE];
173 smpi_container(smpi_process()->index(), container_name, INSTR_DEFAULT_STR_SIZE);
174 container_t container = PJ_container_get(container_name);
175 papi_counter_t& counter_data = smpi_process()->papi_counters();
177 for (auto& pair : counter_data) {
178 new_pajeSetVariable(surf_get_clock(), container,
179 PJ_type_get(/* countername */ pair.first.c_str(), container->type), pair.second);
184 smpi_total_benched_time += xbt_os_timer_elapsed(timer);
187 /* Private sleep function used by smpi_sleep() and smpi_usleep() */
188 static unsigned int private_sleep(double secs)
192 XBT_DEBUG("Sleep for: %lf secs", secs);
193 int rank = MPI_COMM_WORLD->rank();
194 instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
195 extra->type=TRACING_SLEEPING;
196 extra->sleep_duration=secs;
197 TRACE_smpi_sleeping_in(rank, extra);
199 simcall_process_sleep(secs);
201 TRACE_smpi_sleeping_out(rank);
207 unsigned int smpi_sleep(unsigned int secs)
209 return private_sleep(static_cast<double>(secs));
212 int smpi_usleep(useconds_t usecs)
214 return static_cast<int>(private_sleep(static_cast<double>(usecs) / 1000000.0));
217 #if _POSIX_TIMERS > 0
218 int smpi_nanosleep(const struct timespec *tp, struct timespec * t)
220 return static_cast<int>(private_sleep(static_cast<double>(tp->tv_sec + tp->tv_nsec / 1000000000.0)));
224 int smpi_gettimeofday(struct timeval *tv, void* tz)
227 double now = SIMIX_get_clock();
229 tv->tv_sec = static_cast<time_t>(now);
231 tv->tv_usec = static_cast<useconds_t>((now - tv->tv_sec) * 1e6);
233 tv->tv_usec = static_cast<suseconds_t>((now - tv->tv_sec) * 1e6);
240 #if _POSIX_TIMERS > 0
241 int smpi_clock_gettime(clockid_t clk_id, struct timespec *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 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 int benching; /* 1: we are benchmarking; 0: we have enough data, no bench anymore */
287 static char *sample_location(int global, const char *file, int line) {
289 return bprintf("%s:%d", file, line);
291 return bprintf("%s:%d:%d", file, line, smpi_process()->index());
295 static int sample_enough_benchs(local_data_t *data) {
296 int res = data->count >= data->iters;
297 if (data->threshold>0.0) {
299 res = 0; // not enough data
300 if (data->relstderr > data->threshold)
301 res = 0; // stderr too high yet
303 XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
304 (res?"enough benchs":"need more data"), data->count, data->iters, data->relstderr, data->threshold, data->mean);
308 void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
310 char *loc = sample_location(global, file, line);
312 smpi_bench_end(); /* Take time from previous, unrelated computation into account */
313 smpi_process()->set_sampling(1);
315 if (samples==nullptr)
316 samples = xbt_dict_new_homogeneous(free);
318 local_data_t *data = static_cast<local_data_t *>(xbt_dict_get_or_null(samples, loc));
320 xbt_assert(threshold>0 || iters>0,
321 "You should provide either a positive amount of iterations to bench, or a positive maximal stderr (or both)");
322 data = static_cast<local_data_t *>( xbt_new(local_data_t, 1));
325 data->sum_pow2 = 0.0;
327 data->threshold = threshold;
328 data->benching = 1; // If we have no data, we need at least one
330 xbt_dict_set(samples, loc, data, nullptr);
331 XBT_DEBUG("XXXXX First time ever on benched nest %s.",loc);
333 if (data->iters != iters || data->threshold != threshold) {
334 XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. "
335 "How did you manage to give two numbers at the same line??",
336 loc, data->iters, data->threshold, iters, threshold);
340 // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate
341 // the computation instead
342 data->benching = (sample_enough_benchs(data) == 0);
343 XBT_DEBUG("XXXX Re-entering the benched nest %s. %s", loc,
344 (data->benching ? "more benching needed" : "we have enough data, skip computes"));
349 int smpi_sample_2(int global, const char *file, int line)
351 char *loc = sample_location(global, file, line);
354 xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
355 local_data_t *data = static_cast<local_data_t *>(xbt_dict_get(samples, loc));
356 XBT_DEBUG("sample2 %s",loc);
359 if (data->benching==1) {
360 // we need to run a new bench
361 XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f",
362 data->count, data->iters, data->relstderr, data->threshold, data->mean);
365 // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just
366 //ran one bench and need to bail out now that our job is done). Just sleep instead
367 XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f)."
368 " apply the %fs delay instead",
369 data->count, data->iters, data->relstderr, data->threshold, data->mean);
370 smpi_execute(data->mean);
371 smpi_process()->set_sampling(0);
372 res = 0; // prepare to capture future, unrelated computations
378 void smpi_sample_3(int global, const char *file, int line)
380 char *loc = sample_location(global, file, line);
382 xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
383 local_data_t *data = static_cast<local_data_t *>(xbt_dict_get(samples, loc));
384 XBT_DEBUG("sample3 %s",loc);
387 if (data->benching==0)
390 // ok, benchmarking this loop is over
391 xbt_os_threadtimer_stop(smpi_process()->timer());
395 double sample = xbt_os_timer_elapsed(smpi_process()->timer());
397 data->sum_pow2 += sample * sample;
398 double n = static_cast<double>(data->count);
399 data->mean = data->sum / n;
400 data->relstderr = sqrt((data->sum_pow2 / n - data->mean * data->mean) / n) / data->mean;
401 if (sample_enough_benchs(data)==0) {
402 data->mean = sample; // Still in benching process; We want sample_2 to simulate the exact time of this loop
403 // occurrence before leaving, not the mean over the history
405 XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)", data->count,
406 data->mean, data->relstderr, sample);
408 // That's enough for now, prevent sample_2 to run the same code over and over
412 extern "C" { /** These functions will be called from the user code **/
413 smpi_trace_call_location_t* smpi_trace_get_call_location() {
414 return smpi_process()->call_location();
417 void smpi_trace_set_call_location(const char* file, const int line) {
418 smpi_trace_call_location_t* loc = smpi_process()->call_location();
420 loc->previous_filename = loc->filename;
421 loc->previous_linenumber = loc->linenumber;
422 loc->filename = file;
423 loc->linenumber = line;
427 * Required for Fortran bindings
429 void smpi_trace_set_call_location_(const char* file, int* line) {
430 smpi_trace_set_call_location(file, *line);
434 * Required for Fortran if -fsecond-underscore is activated
436 void smpi_trace_set_call_location__(const char* file, int* line) {
437 smpi_trace_set_call_location(file, *line);