97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
/*
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* Copyright (C) 2018 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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// This measures the time required to compute two different native heap size metrics that
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// we might use to guide GC triggering.
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#include <atomic>
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#include <err.h>
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#include <fcntl.h>
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#include <malloc.h>
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#include <pthread.h>
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#include <sched.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <benchmark/benchmark.h>
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#include "util.h"
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static constexpr int NTHREADS = 5;
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static std::atomic<int> thread_count;
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static void* thread_func(void* arg) {
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*reinterpret_cast<void**>(arg) = malloc(17);
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thread_count++;
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return nullptr;
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}
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static void BM_mallinfo(benchmark::State& state) {
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pthread_t t[NTHREADS];
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void* object[NTHREADS];
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// Create threads to populate thread-local arenas, if any.
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thread_count = 0;
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for (int i = 0; i < 5; i++) {
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int res = pthread_create(t + i, NULL, thread_func, object + i);
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if (res != 0) {
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errx(1, "ERROR: pthread_create failed");
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}
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}
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while (thread_count != NTHREADS) {
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sched_yield();
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}
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for (auto _ : state) {
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benchmark::DoNotOptimize(mallinfo().uordblks);
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}
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for (int i = 0; i < 5; i++) {
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int res = pthread_join(t[i], NULL);
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if (res != 0) {
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errx(1, "ERROR: pthread_join failed");
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}
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free(object[i]);
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}
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}
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BIONIC_BENCHMARK(BM_mallinfo);
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static constexpr int BUF_SIZE = 100;
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static void BM_read_statm(benchmark::State& state) {
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char buf[BUF_SIZE];
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int statm_fd = open("/proc/self/statm", O_RDONLY);
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if (statm_fd == -1) {
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errx(1, "ERROR: Open failed");
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}
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for (auto _ : state) {
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off_t result = lseek(statm_fd, 0 /* offset */, SEEK_SET);
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if (result == (off_t) -1) {
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errx(1, "ERROR: lseek to beginning failed");
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}
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ssize_t nread = read(statm_fd, buf, BUF_SIZE);
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if (nread < 13 || nread > 50) {
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errx(1, "ERROR: Implausible read result; result = %zd", nread);
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}
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// We should really add the parsing overhead for the result; but that should be < 100 nsecs
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// if we tweak it enough.
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}
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if (close(statm_fd) == -1) {
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errx(1, "ERROR: Close failed");
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}
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}
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BIONIC_BENCHMARK(BM_read_statm);
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