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benchmark_clock_gettime.c
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benchmark_clock_gettime.c
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "computepi.h"
#define CLOCK_ID CLOCK_MONOTONIC_RAW
#define ONE_SEC 1000000000.0
int main(int argc, char const *argv[])
{
struct timespec start = {0, 0};
struct timespec end = {0, 0};
if (argc < 2) return -1;
int N = atoi(argv[1]);
int i, loop = 25;
// Baseline
clock_gettime(CLOCK_ID, &start);
for (i = 0; i < loop; i++) {
compute_pi_baseline(N);
}
clock_gettime(CLOCK_ID, &end);
printf("%lf,", (double) (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec)/ONE_SEC);
// OpenMP with 2 threads
clock_gettime(CLOCK_ID, &start);
for (i = 0; i < loop; i++) {
compute_pi_openmp(N, 2);
}
clock_gettime(CLOCK_ID, &end);
printf("%lf,", (double) (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec)/ONE_SEC);
// OpenMP with 4 threads
clock_gettime(CLOCK_ID, &start);
for (i = 0; i < loop; i++) {
compute_pi_openmp(N, 4);
}
clock_gettime(CLOCK_ID, &end);
printf("%lf,", (double) (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec)/ONE_SEC);
// AVX SIMD
clock_gettime(CLOCK_ID, &start);
for (i = 0; i < loop; i++) {
compute_pi_avx(N);
}
clock_gettime(CLOCK_ID, &end);
printf("%lf,", (double) (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec)/ONE_SEC);
// AVX SIMD + Loop unrolling
clock_gettime(CLOCK_ID, &start);
for (i = 0; i < loop; i++) {
compute_pi_avx_unroll(N);
}
clock_gettime(CLOCK_ID, &end);
printf("%lf,", (double) (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec)/ONE_SEC);
clock_gettime(CLOCK_ID, &end);
printf("%lf\n", (double) (end.tv_sec - start.tv_sec) +
(end.tv_nsec - start.tv_nsec) / ONE_SEC);
return 0;
}