96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
/*
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* Copyright (C) 2021 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 <benchmark/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 <android-base/strings.h>
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#include <string>
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#include <vector>
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#if defined(__APPLE__)
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// Darwin doesn't support this, so do nothing.
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bool LockToCPU(int) {
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return false;
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}
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#else
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#include <errno.h>
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#include <sched.h>
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bool LockToCPU(int lock_cpu) {
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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CPU_SET(lock_cpu, &cpuset);
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if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
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if (errno == EINVAL) {
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printf("Invalid cpu %d\n", lock_cpu);
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} else {
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perror("sched_setaffinity failed");
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}
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return false;
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}
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printf("Locked to cpu %d\n", lock_cpu);
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return true;
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}
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#endif
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int main(int argc, char** argv) {
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#if defined(__BIONIC__)
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// Enable decay time option to allow frees to run faster at the cost of slightly increasing RSS.
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// All applications on Android run with this option enabled.
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mallopt(M_DECAY_TIME, 1);
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#endif
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std::vector<char*> new_argv;
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// The first argument is not an option, so add it as is.
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new_argv.push_back(argv[0]);
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// Look for the special option --benchmark_lock_cpu.
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int lock_cpu = -1;
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for (int i = 1; i < argc; i++) {
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if (android::base::StartsWith(argv[i], "--benchmark_cpu=")) {
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char* endptr;
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long cpu = strtol(&argv[i][16], &endptr, 10);
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if (endptr == nullptr || *endptr != '\0' || cpu > INT_MAX || cpu < 0) {
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printf("Malformed value for --benchmark_cpu, requires a valid positive number.\n");
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return 1;
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}
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lock_cpu = cpu;
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} else {
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new_argv.push_back(argv[i]);
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}
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}
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new_argv.push_back(nullptr);
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if (lock_cpu != -1 && !LockToCPU(lock_cpu)) {
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return 1;
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}
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int new_argc = new_argv.size() - 1;
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::benchmark::Initialize(&new_argc, new_argv.data());
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if (::benchmark::ReportUnrecognizedArguments(new_argc, new_argv.data())) return 1;
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::benchmark::RunSpecifiedBenchmarks();
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}
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