1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdio.h> 18 #include <stdio_ext.h> 19 #include <stdlib.h> 20 21 #include <benchmark/benchmark.h> 22 23 constexpr auto KB = 1024; 24 25 #define AT_COMMON_SIZES \ 26 Arg(1)->Arg(2)->Arg(3)->Arg(4)->Arg(8)->Arg(16)->Arg(32)->Arg(64)->Arg(512)-> \ 27 Arg(1*KB)->Arg(4*KB)->Arg(8*KB)->Arg(16*KB)->Arg(64*KB) 28 29 template <typename Fn> 30 void ReadWriteTest(benchmark::State& state, Fn f, bool buffered) { 31 size_t chunk_size = state.range(0); 32 33 FILE* fp = fopen("/dev/zero", "rw"); 34 __fsetlocking(fp, FSETLOCKING_BYCALLER); 35 char* buf = new char[chunk_size]; 36 37 if (!buffered) { 38 setvbuf(fp, 0, _IONBF, 0); 39 } 40 41 while (state.KeepRunning()) { 42 f(buf, chunk_size, 1, fp); 43 } 44 45 state.SetBytesProcessed(int64_t(state.iterations()) * int64_t(chunk_size)); 46 delete[] buf; 47 fclose(fp); 48 } 49 50 void BM_stdio_fread(benchmark::State& state) { 51 ReadWriteTest(state, fread, true); 52 } 53 BENCHMARK(BM_stdio_fread)->AT_COMMON_SIZES; 54 55 void BM_stdio_fwrite(benchmark::State& state) { 56 ReadWriteTest(state, fwrite, true); 57 } 58 BENCHMARK(BM_stdio_fwrite)->AT_COMMON_SIZES; 59 60 void BM_stdio_fread_unbuffered(benchmark::State& state) { 61 ReadWriteTest(state, fread, false); 62 } 63 BENCHMARK(BM_stdio_fread_unbuffered)->AT_COMMON_SIZES; 64 65 void BM_stdio_fwrite_unbuffered(benchmark::State& state) { 66 ReadWriteTest(state, fwrite, false); 67 } 68 BENCHMARK(BM_stdio_fwrite_unbuffered)->AT_COMMON_SIZES; 69 70 static void FopenFgetsFclose(benchmark::State& state, bool no_locking) { 71 char buf[1024]; 72 while (state.KeepRunning()) { 73 FILE* fp = fopen("/proc/version", "re"); 74 if (no_locking) __fsetlocking(fp, FSETLOCKING_BYCALLER); 75 if (fgets(buf, sizeof(buf), fp) == nullptr) abort(); 76 fclose(fp); 77 } 78 } 79 80 static void BM_stdio_fopen_fgets_fclose_locking(benchmark::State& state) { 81 FopenFgetsFclose(state, false); 82 } 83 BENCHMARK(BM_stdio_fopen_fgets_fclose_locking); 84 85 void BM_stdio_fopen_fgets_fclose_no_locking(benchmark::State& state) { 86 FopenFgetsFclose(state, true); 87 } 88 BENCHMARK(BM_stdio_fopen_fgets_fclose_no_locking); 89
