3e5754c6ad
Add benchmarks for mallinfo, and for retrieving RSS from /proc/self/statm, since we're considering using these for GC triggering. Add some static linkage specifiers, after running into a build problem due to a spurious conflict. Bug: 111447610 Test: Ran benchmarks Change-Id: Ie50d512294993882728c63ce51ec507590257d80
98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*
|
|
* Copyright (C) 2018 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.
|
|
*/
|
|
|
|
// This measures the time required to compute two different native heap size metrics that
|
|
// we might use to guide GC triggering.
|
|
|
|
#include <atomic>
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <malloc.h>
|
|
#include <pthread.h>
|
|
#include <sched.h>
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <benchmark/benchmark.h>
|
|
#include "util.h"
|
|
|
|
static volatile size_t sink;
|
|
|
|
static constexpr int NTHREADS = 5;
|
|
|
|
static std::atomic<int> thread_count;
|
|
|
|
static void* thread_func(void* arg) {
|
|
*reinterpret_cast<void**>(arg) = malloc(17);
|
|
thread_count++;
|
|
return nullptr;
|
|
}
|
|
|
|
static void BM_mallinfo(benchmark::State& state) {
|
|
pthread_t t[NTHREADS];
|
|
void* object[NTHREADS];
|
|
// Create threads to populate thread-local arenas, if any.
|
|
thread_count = 0;
|
|
for (int i = 0; i < 5; i++) {
|
|
int res = pthread_create(t + i, NULL, thread_func, object + i);
|
|
if (res != 0) {
|
|
errx(1, "ERROR: pthread_create failed");
|
|
}
|
|
}
|
|
while (thread_count != NTHREADS) {
|
|
sched_yield();
|
|
}
|
|
for (auto _ : state) {
|
|
sink = mallinfo().uordblks;
|
|
}
|
|
for (int i = 0; i < 5; i++) {
|
|
int res = pthread_join(t[i], NULL);
|
|
if (res != 0) {
|
|
errx(1, "ERROR: pthread_join failed");
|
|
}
|
|
free(object[i]);
|
|
}
|
|
}
|
|
|
|
BIONIC_BENCHMARK(BM_mallinfo);
|
|
|
|
static constexpr int BUF_SIZE = 100;
|
|
|
|
static void BM_read_statm(benchmark::State& state) {
|
|
char buf[BUF_SIZE];
|
|
int statm_fd = open("/proc/self/statm", O_RDONLY);
|
|
if (statm_fd == -1) {
|
|
errx(1, "ERROR: Open failed");
|
|
}
|
|
for (auto _ : state) {
|
|
off_t result = lseek(statm_fd, 0 /* offset */, SEEK_SET);
|
|
if (result == (off_t) -1) {
|
|
errx(1, "ERROR: lseek to beginning failed");
|
|
}
|
|
ssize_t nread = read(statm_fd, buf, BUF_SIZE);
|
|
if (nread < 13 || nread > 50) {
|
|
errx(1, "ERROR: Implausible read result; result = %zd", nread);
|
|
}
|
|
// We should really add the parsing overhead for the result; but that should be < 100 nsecs
|
|
// if we tweak it enough.
|
|
}
|
|
if (close(statm_fd) == -1) {
|
|
errx(1, "ERROR: Close failed");
|
|
}
|
|
}
|
|
|
|
BIONIC_BENCHMARK(BM_read_statm);
|