1 /* 2 * Copyright (C) 2013 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 <sys/syscall.h> 18 #include <sys/time.h> 19 #include <time.h> 20 #include <unistd.h> 21 22 #include <benchmark/benchmark.h> 23 24 static void BM_time_clock_gettime(benchmark::State& state) { 25 timespec t; 26 while (state.KeepRunning()) { 27 clock_gettime(CLOCK_MONOTONIC, &t); 28 } 29 } 30 BENCHMARK(BM_time_clock_gettime); 31 32 static void BM_time_clock_gettime_syscall(benchmark::State& state) { 33 timespec t; 34 while (state.KeepRunning()) { 35 syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &t); 36 } 37 } 38 BENCHMARK(BM_time_clock_gettime_syscall); 39 40 static void BM_time_gettimeofday(benchmark::State& state) { 41 timeval tv; 42 while (state.KeepRunning()) { 43 gettimeofday(&tv, nullptr); 44 } 45 } 46 BENCHMARK(BM_time_gettimeofday); 47 48 void BM_time_gettimeofday_syscall(benchmark::State& state) { 49 timeval tv; 50 while (state.KeepRunning()) { 51 syscall(__NR_gettimeofday, &tv, nullptr); 52 } 53 } 54 BENCHMARK(BM_time_gettimeofday_syscall); 55 56 void BM_time_time(benchmark::State& state) { 57 while (state.KeepRunning()) { 58 time(nullptr); 59 } 60 } 61 BENCHMARK(BM_time_time); 62 63 void BM_time_localtime(benchmark::State& state) { 64 time_t t = time(nullptr); 65 while (state.KeepRunning()) { 66 localtime(&t); 67 } 68 } 69 BENCHMARK(BM_time_localtime); 70 71 void BM_time_localtime_r(benchmark::State& state) { 72 time_t t = time(nullptr); 73 while (state.KeepRunning()) { 74 struct tm tm; 75 localtime_r(&t, &tm); 76 } 77 } 78 BENCHMARK(BM_time_localtime_r); 79
