68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
#ifndef INC_2015_BENCHMARK_H
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#define INC_2015_BENCHMARK_H
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#include "stdio.h"
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#if WIN32
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#include "windows.h"
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#else
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#include "time.h"
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#endif
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static int sortDoubles(const void* a, const void* b) {
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double x = *(double*) a;
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double y = *(double*) b;
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if (x > y) {
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return 1;
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}
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else if (x < y) {
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return -1;
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}
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else {
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return 0;
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}
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}
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static void formatMillis(const char* text, const double ms) {
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if (ms >= 0.1) {
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printf("\n%s: %.2f ms", text, ms);
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}
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else {
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printf("\n%s: %.2f us", text, ms * 1000.0);
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}
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}
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typedef void (*entryPointCallback)(char* input);
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#define BENCHMARK_RUNS 50001
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void runBenchmark(const entryPointCallback ep, char* input) {
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double benchmarkResults[BENCHMARK_RUNS];
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for (int run = 0; run < BENCHMARK_RUNS; run++) {
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#if WIN32
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LARGE_INTEGER startTime, endTime, frequency;
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QueryPerformanceFrequency(&frequency);
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QueryPerformanceCounter(&startTime);
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ep(input);
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QueryPerformanceCounter(&endTime);
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benchmarkResults[run] = (double) (endTime.QuadPart - startTime.QuadPart) * 1000.0 / (double) frequency.QuadPart;
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#else
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clock_t startTime = clock();
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ep(input);
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clock_t endTime = clock();
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benchmarkResults[run] = ((endTime - startTime) * 1000.0) / CLOCKS_PER_SEC;
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#endif
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}
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qsort(benchmarkResults, BENCHMARK_RUNS, sizeof(double), sortDoubles);
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formatMillis("Median elapsed time", benchmarkResults[BENCHMARK_RUNS / 2]);
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formatMillis("Q1 elapsed time", benchmarkResults[(BENCHMARK_RUNS * 25) / 100]);
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formatMillis("Q3 elapsed time", benchmarkResults[(BENCHMARK_RUNS * 75) / 100]);
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}
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#undef BENCHMARK_RUNS
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#endif //INC_2015_BENCHMARK_H
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