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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <benchmark/benchmark.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <android-base/strings.h>
#include <string>
#include <vector>
#if defined(__APPLE__)
// Darwin doesn't support this, so do nothing.
bool LockToCPU(int) {
return false;
}
#else
#include <errno.h>
#include <sched.h>
bool LockToCPU(int lock_cpu) {
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(lock_cpu, &cpuset);
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
if (errno == EINVAL) {
printf("Invalid cpu %d\n", lock_cpu);
} else {
perror("sched_setaffinity failed");
}
return false;
}
printf("Locked to cpu %d\n", lock_cpu);
return true;
}
#endif
int main(int argc, char** argv) {
#if defined(__BIONIC__)
// Enable decay time option to allow frees to run faster at the cost of slightly increasing RSS.
// All applications on Android run with this option enabled.
mallopt(M_DECAY_TIME, 1);
#endif
std::vector<char*> new_argv;
// The first argument is not an option, so add it as is.
new_argv.push_back(argv[0]);
// Look for the special option --benchmark_lock_cpu.
int lock_cpu = -1;
for (int i = 1; i < argc; i++) {
if (android::base::StartsWith(argv[i], "--benchmark_cpu=")) {
char* endptr;
long cpu = strtol(&argv[i][16], &endptr, 10);
if (endptr == nullptr || *endptr != '\0' || cpu > INT_MAX || cpu < 0) {
printf("Malformed value for --benchmark_cpu, requires a valid positive number.\n");
return 1;
}
lock_cpu = cpu;
} else {
new_argv.push_back(argv[i]);
}
}
new_argv.push_back(nullptr);
if (lock_cpu != -1 && !LockToCPU(lock_cpu)) {
return 1;
}
int new_argc = new_argv.size() - 1;
::benchmark::Initialize(&new_argc, new_argv.data());
if (::benchmark::ReportUnrecognizedArguments(new_argc, new_argv.data())) return 1;
::benchmark::RunSpecifiedBenchmarks();
}
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