121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
// -*- Mode: C; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "run_benchmark.h"
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#include <limits.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 <sys/time.h>
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struct internal_bench {
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bench_body body;
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uintptr_t param;
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};
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static void run_body(struct internal_bench *b, long iterations)
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{
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b->body(iterations, b->param);
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}
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static double measure_once(struct internal_bench *b, long iterations)
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{
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struct timeval tv_before, tv_after;
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int rv;
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double time;
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rv = gettimeofday(&tv_before, NULL);
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if (rv) {
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perror("gettimeofday");
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abort();
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}
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run_body(b, iterations);
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rv = gettimeofday(&tv_after, NULL);
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if (rv) {
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perror("gettimeofday");
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abort();
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}
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tv_after.tv_sec -= tv_before.tv_sec;
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time = tv_after.tv_sec * 1E6 + tv_after.tv_usec;
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time -= tv_before.tv_usec;
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time *= 1000;
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return time;
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}
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#define TRIAL_NSEC 0.3E9
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#define TARGET_NSEC 3E9
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static double run_benchmark(struct internal_bench *b)
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{
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long iterations = 128;
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double nsec;
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while (1) {
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nsec = measure_once(b, iterations);
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if (nsec > TRIAL_NSEC) {
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break;
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}
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iterations = ((unsigned long)iterations) << 1;
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if (iterations <= 0) { // overflow
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abort();
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}
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}
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while (nsec < TARGET_NSEC) {
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double target_iterations = iterations * TARGET_NSEC * 1.1 / nsec;
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if (target_iterations > (double)LONG_MAX) {
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abort();
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}
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iterations = target_iterations;
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nsec = measure_once(b, iterations);
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}
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return nsec / iterations;
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}
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void report_benchmark(const char *name, bench_body body, uintptr_t param)
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{
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int i;
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struct internal_bench b = {.body = body, .param = param};
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for (i = 0; i < 3; i++) {
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double nsec = run_benchmark(&b);
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int slen;
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int padding_size;
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slen = printf("Benchmark: %s", name);
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if (param && name[strlen(name)-1] != ')') {
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slen += printf("(%lld)", (long long)param);
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}
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padding_size = 60 - slen;
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if (padding_size < 1) {
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padding_size = 1;
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}
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printf("%*c%f nsec\n", padding_size, ' ', nsec);
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fflush(stdout);
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}
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}
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