47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
#include "util.h"
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#include <math.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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static double start_time[8];
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void timer_init() { srand(time(NULL)); }
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static double get_time() {
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struct timespec tv;
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clock_gettime(CLOCK_MONOTONIC, &tv);
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return tv.tv_sec + tv.tv_nsec * 1e-9;
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}
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void timer_start(int i) { start_time[i] = get_time(); }
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double timer_stop(int i) { return get_time() - start_time[i]; }
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// Assume f is a black-box operation
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double f(double x) { return 4.0 / (1.0 + x * x); }
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void check_riemannsum(int num_intervals, double parallel_result) {
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double eps = 1e-5;
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double sum = 0.0;
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double h = 1.0 / (double)num_intervals;
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for (int i = 1; i <= num_intervals; i++) {
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double x = h * ((double)i - 0.5);
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sum += h * f(x);
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}
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if (fabsf(parallel_result - sum) > eps &&
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(sum == 0 || fabsf((parallel_result - sum) / sum) > eps)) {
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printf("FAIL\n");
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printf("Correct value: %f, Your value: %f\n", sum, parallel_result);
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} else {
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printf("PASS\n");
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}
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}
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