88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <benchmark/benchmark.h>
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constexpr auto KB = 1024;
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#define AT_COMMON_SIZES \
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Arg(1)->Arg(2)->Arg(3)->Arg(4)->Arg(8)->Arg(16)->Arg(32)->Arg(64)->Arg(512)-> \
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Arg(1*KB)->Arg(4*KB)->Arg(8*KB)->Arg(16*KB)->Arg(64*KB)
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template <typename Fn>
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void ReadWriteTest(benchmark::State& state, Fn f, bool buffered) {
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size_t chunk_size = state.range(0);
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FILE* fp = fopen("/dev/zero", "rw");
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__fsetlocking(fp, FSETLOCKING_BYCALLER);
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char* buf = new char[chunk_size];
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if (!buffered) {
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setvbuf(fp, 0, _IONBF, 0);
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}
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while (state.KeepRunning()) {
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f(buf, chunk_size, 1, fp);
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}
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state.SetBytesProcessed(int64_t(state.iterations()) * int64_t(chunk_size));
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delete[] buf;
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fclose(fp);
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}
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void BM_stdio_fread(benchmark::State& state) {
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ReadWriteTest(state, fread, true);
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}
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BENCHMARK(BM_stdio_fread)->AT_COMMON_SIZES;
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void BM_stdio_fwrite(benchmark::State& state) {
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ReadWriteTest(state, fwrite, true);
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}
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BENCHMARK(BM_stdio_fwrite)->AT_COMMON_SIZES;
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void BM_stdio_fread_unbuffered(benchmark::State& state) {
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ReadWriteTest(state, fread, false);
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}
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BENCHMARK(BM_stdio_fread_unbuffered)->AT_COMMON_SIZES;
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void BM_stdio_fwrite_unbuffered(benchmark::State& state) {
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ReadWriteTest(state, fwrite, false);
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}
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BENCHMARK(BM_stdio_fwrite_unbuffered)->AT_COMMON_SIZES;
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static void FopenFgetsFclose(benchmark::State& state, bool no_locking) {
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char buf[1024];
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while (state.KeepRunning()) {
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FILE* fp = fopen("/proc/version", "re");
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if (no_locking) __fsetlocking(fp, FSETLOCKING_BYCALLER);
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if (fgets(buf, sizeof(buf), fp) == nullptr) abort();
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fclose(fp);
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}
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}
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static void BM_stdio_fopen_fgets_fclose_locking(benchmark::State& state) {
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FopenFgetsFclose(state, false);
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}
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BENCHMARK(BM_stdio_fopen_fgets_fclose_locking);
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void BM_stdio_fopen_fgets_fclose_no_locking(benchmark::State& state) {
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FopenFgetsFclose(state, true);
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}
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BENCHMARK(BM_stdio_fopen_fgets_fclose_no_locking);
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