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74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
#ifndef ELAPSED_H
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#define ELAPSED_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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/* Based on http://stackoverflow.com/a/8583395 */
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#if !defined(_WIN32)
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#include <sys/time.h>
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static double elapsed_realtime(void) { // returns 0 seconds first time called
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static struct timeval t0;
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struct timeval tv;
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gettimeofday(&tv, 0);
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if (!t0.tv_sec)
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t0 = tv;
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return (double)(tv.tv_sec - t0.tv_sec) + (double)(tv.tv_usec - t0.tv_usec) / 1e6;
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}
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#else
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#include <windows.h>
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#ifndef FatalError
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#define FatalError(s) do { perror(s); exit(-1); } while(0)
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#endif
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static double elapsed_realtime(void) { // granularity about 50 microsecs on my machine
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static LARGE_INTEGER freq, start;
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LARGE_INTEGER count;
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if (!QueryPerformanceCounter(&count))
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FatalError("QueryPerformanceCounter");
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if (!freq.QuadPart) { // one time initialization
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if (!QueryPerformanceFrequency(&freq))
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FatalError("QueryPerformanceFrequency");
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start = count;
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}
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return (double)(count.QuadPart - start.QuadPart) / freq.QuadPart;
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}
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#endif
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/* end Based on stackoverflow */
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static int show_benchmark(const char *descr, double t1, double t2, size_t size, int rep, const char *reptext)
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{
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double tdiff = t2 - t1;
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double nstime;
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printf("operation: %s\n", descr);
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printf("elapsed time: %.3f (s)\n", tdiff);
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printf("iterations: %d\n", rep);
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printf("size: %lu (bytes)\n", (unsigned long)size);
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printf("bandwidth: %.3f (MB/s)\n", (double)rep * (double)size / 1e6 / tdiff);
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printf("throughput in ops per sec: %.3f\n", rep / tdiff);
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if (reptext && rep != 1) {
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printf("throughput in %s ops per sec: %.3f\n", reptext, 1 / tdiff);
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}
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nstime = tdiff * 1e9 / rep;
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if (nstime < 1000) {
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printf("time per op: %.3f (ns)\n", nstime);
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} else if (nstime < 1e6) {
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printf("time per op: %.3f (us)\n", nstime / 1000);
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} else if (nstime < 1e9) {
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printf("time per op: %.3f (ms)\n", nstime / 1e6);
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} else {
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printf("time per op: %.3f (s)\n", nstime / 1e9);
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}
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* ELAPSED_H */
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