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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <AK/ScopeGuard.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibCore/ElapsedTimer.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
struct Result {
u64 write_bps {};
u64 read_bps {};
};
static Result average_result(const Vector<Result>& results)
{
Result average;
for (auto& res : results) {
average.write_bps += res.write_bps;
average.read_bps += res.read_bps;
}
average.write_bps /= results.size();
average.read_bps /= results.size();
return average;
}
static void exit_with_usage(int rc)
{
warnln("Usage: disk_benchmark [-h] [-d directory] [-t time_per_benchmark] [-f file_size1,file_size2,...] [-b block_size1,block_size2,...]");
exit(rc);
}
static Optional<Result> benchmark(const String& filename, int file_size, int block_size, ByteBuffer& buffer, bool allow_cache);
int main(int argc, char** argv)
{
String directory = ".";
int time_per_benchmark = 10;
Vector<size_t> file_sizes;
Vector<size_t> block_sizes;
bool allow_cache = false;
int opt;
while ((opt = getopt(argc, argv, "chd:t:f:b:")) != -1) {
switch (opt) {
case 'h':
exit_with_usage(0);
break;
case 'c':
allow_cache = true;
break;
case 'd':
directory = optarg;
break;
case 't':
time_per_benchmark = atoi(optarg);
break;
case 'f':
for (const auto& size : String(optarg).split(','))
file_sizes.append(atoi(size.characters()));
break;
case 'b':
for (const auto& size : String(optarg).split(','))
block_sizes.append(atoi(size.characters()));
break;
}
}
if (file_sizes.size() == 0) {
file_sizes = { 131072, 262144, 524288, 1048576, 5242880 };
}
if (block_sizes.size() == 0) {
block_sizes = { 8192, 32768, 65536 };
}
umask(0644);
auto filename = String::formatted("{}/disk_benchmark.tmp", directory);
for (auto file_size : file_sizes) {
for (auto block_size : block_sizes) {
if (block_size > file_size)
continue;
auto buffer_result = ByteBuffer::create_uninitialized(block_size);
if (buffer_result.is_error()) {
warnln("Not enough memory to allocate space for block size = {}", block_size);
continue;
}
Vector<Result> results;
outln("Running: file_size={} block_size={}", file_size, block_size);
auto timer = Core::ElapsedTimer::start_new();
while (timer.elapsed() < time_per_benchmark * 1000) {
out(".");
fflush(stdout);
auto result = benchmark(filename, file_size, block_size, buffer_result.value(), allow_cache);
if (!result.has_value())
return 1;
results.append(result.release_value());
usleep(100);
}
auto average = average_result(results);
outln("Finished: runs={} time={}ms write_bps={} read_bps={}", results.size(), timer.elapsed(), average.write_bps, average.read_bps);
sleep(1);
}
}
return 0;
}
Optional<Result> benchmark(const String& filename, int file_size, int block_size, ByteBuffer& buffer, bool allow_cache)
{
int flags = O_CREAT | O_TRUNC | O_RDWR;
if (!allow_cache)
flags |= O_DIRECT;
int fd = open(filename.characters(), flags, 0644);
if (fd == -1) {
perror("open");
exit(1);
}
auto fd_cleanup = ScopeGuard([fd, filename] {
if (close(fd) < 0)
perror("close");
if (unlink(filename.characters()) < 0)
perror("unlink");
});
Result result;
auto timer = Core::ElapsedTimer::start_new();
ssize_t total_written = 0;
while (total_written < file_size) {
auto nwritten = write(fd, buffer.data(), block_size);
if (nwritten < 0) {
perror("write");
return {};
}
total_written += nwritten;
}
result.write_bps = (u64)(timer.elapsed() ? (file_size / timer.elapsed()) : file_size) * 1000;
if (lseek(fd, 0, SEEK_SET) < 0) {
perror("lseek");
return {};
}
timer.start();
ssize_t total_read = 0;
while (total_read < file_size) {
auto nread = read(fd, buffer.data(), block_size);
if (nread < 0) {
perror("read");
return {};
}
total_read += nread;
}
result.read_bps = (u64)(timer.elapsed() ? (file_size / timer.elapsed()) : file_size) * 1000;
return result;
}
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