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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Kenneth Myhra <kennethmyhra@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <AK/DeprecatedString.h>
#include <AK/ScopeGuard.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
struct Result {
u64 write_bps {};
u64 read_bps {};
};
static Result average_result(Vector<Result> const& 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 ErrorOr<Result> benchmark(DeprecatedString const& filename, int file_size, ByteBuffer& buffer, bool allow_cache);
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
DeprecatedString directory = ".";
int time_per_benchmark = 10;
Vector<size_t> file_sizes;
Vector<size_t> block_sizes;
bool allow_cache = false;
Core::ArgsParser args_parser;
args_parser.add_option(allow_cache, "Allow using disk cache", "cache", 'c');
args_parser.add_option(directory, "Path to a directory where we can store the disk benchmark temp file", "directory", 'd', "directory");
args_parser.add_option(time_per_benchmark, "Time elapsed per benchmark", "time-per-benchmark", 't', "time-per-benchmark");
args_parser.add_option(file_sizes, "A comma-separated list of file sizes", "file-size", 'f', "file-size");
args_parser.add_option(block_sizes, "A comma-separated list of block sizes", "block-size", 'b', "block-size");
args_parser.parse(arguments);
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 = DeprecatedString::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 = TRY(benchmark(filename, file_size, buffer_result.value(), allow_cache));
results.append(result);
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;
}
ErrorOr<Result> benchmark(DeprecatedString const& filename, int file_size, ByteBuffer& buffer, bool allow_cache)
{
int flags = O_CREAT | O_TRUNC | O_RDWR;
if (!allow_cache)
flags |= O_DIRECT;
int fd = TRY(Core::System::open(filename, flags, 0644));
auto fd_cleanup = ScopeGuard([fd, filename] {
auto void_or_error = Core::System::close(fd);
if (void_or_error.is_error())
warnln("{}", void_or_error.release_error());
void_or_error = Core::System::unlink(filename);
if (void_or_error.is_error())
warnln("{}", void_or_error.release_error());
});
Result result;
auto timer = Core::ElapsedTimer::start_new();
ssize_t total_written = 0;
while (total_written < file_size) {
auto nwritten = TRY(Core::System::write(fd, buffer));
total_written += nwritten;
}
result.write_bps = (u64)(timer.elapsed() ? (file_size / timer.elapsed()) : file_size) * 1000;
TRY(Core::System::lseek(fd, 0, SEEK_SET));
timer.start();
ssize_t total_read = 0;
while (total_read < file_size) {
auto nread = TRY(Core::System::read(fd, buffer));
total_read += nread;
}
result.read_bps = (u64)(timer.elapsed() ? (file_size / timer.elapsed()) : file_size) * 1000;
return result;
}
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