+++ /dev/null
-/* Copyright (c) 2007, 2009-2017. The SimGrid Team. All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "src/internal_config.h"
-#include "private.h"
-#include "private.hpp"
-#include "simgrid/modelchecker.h"
-#include "src/mc/mc_replay.h"
-#include "src/smpi/smpi_process.hpp"
-#include "src/smpi/smpi_comm.hpp"
-
-#ifndef WIN32
-#include <sys/mman.h>
-#endif
-#include <math.h> // sqrt
-
-#if HAVE_PAPI
-#include <papi.h>
-#endif
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_bench, smpi, "Logging specific to SMPI (benchmarking)");
-
-
-xbt_dict_t samples = nullptr; /* Allocated on first use */
-
-double smpi_cpu_threshold = -1;
-double smpi_host_speed;
-
-shared_malloc_type smpi_cfg_shared_malloc = shmalloc_global;
-double smpi_total_benched_time = 0;
-smpi_privatization_region_t smpi_privatization_regions;
-
-void smpi_bench_destroy()
-{
- xbt_dict_free(&samples);
-}
-
-extern "C" XBT_PUBLIC(void) smpi_execute_flops_(double *flops);
-void smpi_execute_flops_(double *flops)
-{
- smpi_execute_flops(*flops);
-}
-
-extern "C" XBT_PUBLIC(void) smpi_execute_(double *duration);
-void smpi_execute_(double *duration)
-{
- smpi_execute(*duration);
-}
-
-void smpi_execute_flops(double flops) {
- XBT_DEBUG("Handle real computation time: %f flops", flops);
- smx_activity_t action = simcall_execution_start("computation", flops, 1, 0);
- simcall_set_category (action, TRACE_internal_smpi_get_category());
- simcall_execution_wait(action);
- smpi_switch_data_segment(smpi_process()->index());
-}
-
-void smpi_execute(double duration)
-{
- if (duration >= smpi_cpu_threshold) {
- XBT_DEBUG("Sleep for %g to handle real computation time", duration);
- double flops = duration * smpi_host_speed;
- int rank = smpi_process()->index();
- instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
- extra->type=TRACING_COMPUTING;
- extra->comp_size=flops;
- TRACE_smpi_computing_in(rank, extra);
-
- smpi_execute_flops(flops);
-
- TRACE_smpi_computing_out(rank);
-
- } else {
- XBT_DEBUG("Real computation took %g while option smpi/cpu_threshold is set to %g => ignore it", duration,
- smpi_cpu_threshold);
- }
-}
-
-void smpi_execute_benched(double duration)
-{
- smpi_bench_end();
- smpi_execute(duration);
- smpi_bench_begin();
-}
-
-void smpi_bench_begin()
-{
- if (smpi_privatize_global_variables == SMPI_PRIVATIZE_MMAP) {
- smpi_switch_data_segment(smpi_process()->index());
- }
-
- if (MC_is_active() || MC_record_replay_is_active())
- return;
-
-#if HAVE_PAPI
- if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
- int event_set = smpi_process()->papi_event_set();
- // PAPI_start sets everything to 0! See man(3) PAPI_start
- if (PAPI_LOW_LEVEL_INITED == PAPI_is_initialized()) {
- if (PAPI_start(event_set) != PAPI_OK) {
- // TODO This needs some proper handling.
- XBT_CRITICAL("Could not start PAPI counters.\n");
- xbt_die("Error.");
- }
- }
- }
-#endif
- xbt_os_threadtimer_start(smpi_process()->timer());
-}
-
-void smpi_bench_end()
-{
- if (MC_is_active() || MC_record_replay_is_active())
- return;
-
- double speedup = 1;
- xbt_os_timer_t timer = smpi_process()->timer();
- xbt_os_threadtimer_stop(timer);
-
-#if HAVE_PAPI
- /**
- * An MPI function has been called and now is the right time to update
- * our PAPI counters for this process.
- */
- if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0') {
- papi_counter_t& counter_data = smpi_process()->papi_counters();
- int event_set = smpi_process()->papi_event_set();
- std::vector<long long> event_values = std::vector<long long>(counter_data.size());
-
- if (PAPI_stop(event_set, &event_values[0]) != PAPI_OK) { // Error
- XBT_CRITICAL("Could not stop PAPI counters.\n");
- xbt_die("Error.");
- } else {
- for (unsigned int i = 0; i < counter_data.size(); i++) {
- counter_data[i].second += event_values[i];
- // XBT_DEBUG("[%i] PAPI: Counter %s: Value is now %lli (got increment by %lli\n", smpi_process()->index(),
- // counter_data[i].first.c_str(), counter_data[i].second, event_values[i]);
- }
- }
- }
-#endif
-
- if (smpi_process()->sampling()) {
- XBT_CRITICAL("Cannot do recursive benchmarks.");
- XBT_CRITICAL("Are you trying to make a call to MPI within a SMPI_SAMPLE_ block?");
- xbt_backtrace_display_current();
- xbt_die("Aborting.");
- }
-
- if (xbt_cfg_get_string("smpi/comp-adjustment-file")[0] != '\0') { // Maybe we need to artificially speed up or slow
- // down our computation based on our statistical analysis.
-
- smpi_trace_call_location_t* loc = smpi_process()->call_location();
- std::string key = loc->get_composed_key();
- std::unordered_map<std::string, double>::const_iterator it = location2speedup.find(key);
- if (it != location2speedup.end()) {
- speedup = it->second;
- }
- }
-
- // Simulate the benchmarked computation unless disabled via command-line argument
- if (xbt_cfg_get_boolean("smpi/simulate-computation")) {
- smpi_execute(xbt_os_timer_elapsed(timer)/speedup);
- }
-
-#if HAVE_PAPI
- if (xbt_cfg_get_string("smpi/papi-events")[0] != '\0' && TRACE_smpi_is_enabled()) {
- char container_name[INSTR_DEFAULT_STR_SIZE];
- smpi_container(smpi_process()->index(), container_name, INSTR_DEFAULT_STR_SIZE);
- container_t container = PJ_container_get(container_name);
- papi_counter_t& counter_data = smpi_process()->papi_counters();
-
- for (auto& pair : counter_data) {
- new_pajeSetVariable(surf_get_clock(), container,
- PJ_type_get(/* countername */ pair.first.c_str(), container->type), pair.second);
- }
- }
-#endif
-
- smpi_total_benched_time += xbt_os_timer_elapsed(timer);
-}
-
-/* Private sleep function used by smpi_sleep() and smpi_usleep() */
-static unsigned int private_sleep(double secs)
-{
- smpi_bench_end();
-
- XBT_DEBUG("Sleep for: %lf secs", secs);
- int rank = MPI_COMM_WORLD->rank();
- instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
- extra->type=TRACING_SLEEPING;
- extra->sleep_duration=secs;
- TRACE_smpi_sleeping_in(rank, extra);
-
- simcall_process_sleep(secs);
-
- TRACE_smpi_sleeping_out(rank);
-
- smpi_bench_begin();
- return 0;
-}
-
-unsigned int smpi_sleep(unsigned int secs)
-{
- return private_sleep(static_cast<double>(secs));
-}
-
-int smpi_usleep(useconds_t usecs)
-{
- return static_cast<int>(private_sleep(static_cast<double>(usecs) / 1000000.0));
-}
-
-#if _POSIX_TIMERS > 0
-int smpi_nanosleep(const struct timespec *tp, struct timespec * t)
-{
- return static_cast<int>(private_sleep(static_cast<double>(tp->tv_sec + tp->tv_nsec / 1000000000.0)));
-}
-#endif
-
-int smpi_gettimeofday(struct timeval *tv, void* tz)
-{
- smpi_bench_end();
- double now = SIMIX_get_clock();
- if (tv) {
- tv->tv_sec = static_cast<time_t>(now);
-#ifdef WIN32
- tv->tv_usec = static_cast<useconds_t>((now - tv->tv_sec) * 1e6);
-#else
- tv->tv_usec = static_cast<suseconds_t>((now - tv->tv_sec) * 1e6);
-#endif
- }
- smpi_bench_begin();
- return 0;
-}
-
-#if _POSIX_TIMERS > 0
-int smpi_clock_gettime(clockid_t clk_id, struct timespec *tp)
-{
- //there is only one time in SMPI, so clk_id is ignored.
- smpi_bench_end();
- double now = SIMIX_get_clock();
- if (tp) {
- tp->tv_sec = static_cast<time_t>(now);
- tp->tv_nsec = static_cast<long int>((now - tp->tv_sec) * 1e9);
- }
- smpi_bench_begin();
- return 0;
-}
-#endif
-
-extern double sg_surf_precision;
-unsigned long long smpi_rastro_resolution ()
-{
- smpi_bench_end();
- double resolution = (1/sg_surf_precision);
- smpi_bench_begin();
- return static_cast<unsigned long long>(resolution);
-}
-
-unsigned long long smpi_rastro_timestamp ()
-{
- smpi_bench_end();
- double now = SIMIX_get_clock();
-
- unsigned long long sec = static_cast<unsigned long long>(now);
- unsigned long long pre = (now - sec) * smpi_rastro_resolution();
- smpi_bench_begin();
- return static_cast<unsigned long long>(sec) * smpi_rastro_resolution() + pre;
-}
-
-/* ****************************** Functions related to the SMPI_SAMPLE_ macros ************************************/
-typedef struct {
- double threshold; /* maximal stderr requested (if positive) */
- double relstderr; /* observed stderr so far */
- double mean; /* mean of benched times, to be used if the block is disabled */
- double sum; /* sum of benched times (to compute the mean and stderr) */
- double sum_pow2; /* sum of the square of the benched times (to compute the stderr) */
- int iters; /* amount of requested iterations */
- int count; /* amount of iterations done so far */
- int benching; /* 1: we are benchmarking; 0: we have enough data, no bench anymore */
-} local_data_t;
-
-static char *sample_location(int global, const char *file, int line) {
- if (global) {
- return bprintf("%s:%d", file, line);
- } else {
- return bprintf("%s:%d:%d", file, line, smpi_process()->index());
- }
-}
-
-static int sample_enough_benchs(local_data_t *data) {
- int res = data->count >= data->iters;
- if (data->threshold>0.0) {
- if (data->count <2)
- res = 0; // not enough data
- if (data->relstderr > data->threshold)
- res = 0; // stderr too high yet
- }
- XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
- (res?"enough benchs":"need more data"), data->count, data->iters, data->relstderr, data->threshold, data->mean);
- return res;
-}
-
-void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
-{
- char *loc = sample_location(global, file, line);
-
- smpi_bench_end(); /* Take time from previous, unrelated computation into account */
- smpi_process()->set_sampling(1);
-
- if (samples==nullptr)
- samples = xbt_dict_new_homogeneous(free);
-
- local_data_t *data = static_cast<local_data_t *>(xbt_dict_get_or_null(samples, loc));
- if (data==nullptr) {
- xbt_assert(threshold>0 || iters>0,
- "You should provide either a positive amount of iterations to bench, or a positive maximal stderr (or both)");
- data = static_cast<local_data_t *>( xbt_new(local_data_t, 1));
- data->count = 0;
- data->sum = 0.0;
- data->sum_pow2 = 0.0;
- data->iters = iters;
- data->threshold = threshold;
- data->benching = 1; // If we have no data, we need at least one
- data->mean = 0;
- xbt_dict_set(samples, loc, data, nullptr);
- XBT_DEBUG("XXXXX First time ever on benched nest %s.",loc);
- } else {
- if (data->iters != iters || data->threshold != threshold) {
- XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. "
- "How did you manage to give two numbers at the same line??",
- loc, data->iters, data->threshold, iters, threshold);
- THROW_IMPOSSIBLE;
- }
-
- // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate
- // the computation instead
- data->benching = (sample_enough_benchs(data) == 0);
- XBT_DEBUG("XXXX Re-entering the benched nest %s. %s", loc,
- (data->benching ? "more benching needed" : "we have enough data, skip computes"));
- }
- xbt_free(loc);
-}
-
-int smpi_sample_2(int global, const char *file, int line)
-{
- char *loc = sample_location(global, file, line);
- int res;
-
- xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
- local_data_t *data = static_cast<local_data_t *>(xbt_dict_get(samples, loc));
- XBT_DEBUG("sample2 %s",loc);
- xbt_free(loc);
-
- if (data->benching==1) {
- // we need to run a new bench
- XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f",
- data->count, data->iters, data->relstderr, data->threshold, data->mean);
- res = 1;
- } else {
- // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just
- //ran one bench and need to bail out now that our job is done). Just sleep instead
- XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f)."
- " apply the %fs delay instead",
- data->count, data->iters, data->relstderr, data->threshold, data->mean);
- smpi_execute(data->mean);
- smpi_process()->set_sampling(0);
- res = 0; // prepare to capture future, unrelated computations
- }
- smpi_bench_begin();
- return res;
-}
-
-void smpi_sample_3(int global, const char *file, int line)
-{
- char *loc = sample_location(global, file, line);
-
- xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
- local_data_t *data = static_cast<local_data_t *>(xbt_dict_get(samples, loc));
- XBT_DEBUG("sample3 %s",loc);
- xbt_free(loc);
-
- if (data->benching==0)
- THROW_IMPOSSIBLE;
-
- // ok, benchmarking this loop is over
- xbt_os_threadtimer_stop(smpi_process()->timer());
-
- // update the stats
- data->count++;
- double sample = xbt_os_timer_elapsed(smpi_process()->timer());
- data->sum += sample;
- data->sum_pow2 += sample * sample;
- double n = static_cast<double>(data->count);
- data->mean = data->sum / n;
- data->relstderr = sqrt((data->sum_pow2 / n - data->mean * data->mean) / n) / data->mean;
- if (sample_enough_benchs(data)==0) {
- data->mean = sample; // Still in benching process; We want sample_2 to simulate the exact time of this loop
- // occurrence before leaving, not the mean over the history
- }
- XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)", data->count,
- data->mean, data->relstderr, sample);
-
- // That's enough for now, prevent sample_2 to run the same code over and over
- data->benching = 0;
-}
-
-extern "C" { /** These functions will be called from the user code **/
- smpi_trace_call_location_t* smpi_trace_get_call_location() {
- return smpi_process()->call_location();
- }
-
- void smpi_trace_set_call_location(const char* file, const int line) {
- smpi_trace_call_location_t* loc = smpi_process()->call_location();
-
- loc->previous_filename = loc->filename;
- loc->previous_linenumber = loc->linenumber;
- loc->filename = file;
- loc->linenumber = line;
- }
-
- /**
- * Required for Fortran bindings
- */
- void smpi_trace_set_call_location_(const char* file, int* line) {
- smpi_trace_set_call_location(file, *line);
- }
-
- /**
- * Required for Fortran if -fsecond-underscore is activated
- */
- void smpi_trace_set_call_location__(const char* file, int* line) {
- smpi_trace_set_call_location(file, *line);
- }
-}
