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88 lines
2.5 KiB
88 lines
2.5 KiB
/* |
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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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