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omp_nested.cpp
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144 lines (125 loc) · 3.64 KB
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/*
Copyright (c) 2005-2017 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <cstddef>
#include <cstdlib>
#include <cstdio>
#include <float.h>
#include <math.h>
#include <time.h>
#include <omp.h>
#include <assert.h>
#include "thread_level.h"
#if _WIN32||_WIN64
#include <Windows.h> /* Need Sleep */
#else
#include <unistd.h> /* Need usleep */
#endif
void MilliSleep( unsigned milliseconds ) {
#if _WIN32||_WIN64
Sleep( milliseconds );
#else
usleep( milliseconds*1000 );
#endif /* _WIN32||_WIN64 */
}
// Algorithm parameters
const int Max_OMP_Outer_Threads = 8;
// Global variables
int max_outer_threads = Max_OMP_Outer_Threads;
// Print help on command-line arguments
void help_message(char *prog_name) {
fprintf(stderr, "\n%s usage:\n", prog_name);
fprintf(stderr,
" Parameters:\n"
" -o<num> : max # of threads OMP should use at outer level\n"
"\n Help:\n"
" -h : print this help message\n");
}
// Process command-line arguments
void process_args(int argc, char *argv[], int *max_outer_t) {
(*max_outer_t) = omp_get_max_threads();
for (int i=1; i<argc; ++i) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 'o': // set max_outer_threads
if (sscanf(&argv[i][2], "%d", max_outer_t) != 1 || *max_outer_t < 1) {
fprintf(stderr, "%s Warning: argument of -o option unacceptable: %s\n", argv[0], &argv[i][2]);
help_message(argv[0]);
}
break;
case 'h': // print help message
help_message(argv[0]);
exit(0);
break;
default:
fprintf(stderr, "%s: Warning: command-line option ignored: %s\n", argv[0], argv[i]);
help_message(argv[0]);
break;
}
} else {
fprintf(stderr, "%s: Warning: command-line option ignored: %s\n", argv[0], argv[i]);
help_message(argv[0]);
}
}
}
int main(int argc, char *argv[]) {
process_args(argc, argv, &max_outer_threads);
#ifdef LOG_THREADS
TotalThreadLevel.init();
#endif
double start, end;
start = omp_get_wtime( );
#pragma omp parallel num_threads(max_outer_threads)
{
int omp_thread = omp_get_thread_num();
#ifdef LOG_THREADS
if (omp_thread == 0)
TotalThreadLevel.change_level(omp_get_num_threads(), omp_outer);
#endif
if (omp_thread == 0) {
MilliSleep(3000);
#ifdef LOG_THREADS
TotalThreadLevel.change_level(-1, omp_outer);
#endif
#pragma omp parallel
{
int my_omp_thread = omp_get_thread_num();
#ifdef LOG_THREADS
if (my_omp_thread == 0)
TotalThreadLevel.change_level(omp_get_num_threads(), omp_inner);
#endif
printf("Inner thread %d nested inside outer thread %d\n", my_omp_thread, omp_thread);
#ifdef LOG_THREADS
if (my_omp_thread == 0)
TotalThreadLevel.change_level(-omp_get_num_threads(), omp_inner);
#endif
}
#ifdef LOG_THREADS
TotalThreadLevel.change_level(1, omp_outer);
#endif
}
else {
MilliSleep(6000);
}
#ifdef LOG_THREADS
if (omp_thread == 0)
TotalThreadLevel.change_level(-omp_get_num_threads(), omp_outer);
#endif
}
end = omp_get_wtime( );
printf("Simple test of nested OMP (%d outer threads max) took: %6.6f\n",
max_outer_threads, end-start);
#ifdef LOG_THREADS
TotalThreadLevel.dump();
#endif
return 0;
}