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#include <AK/ByteBuffer.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibCore/CElapsedTimer.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
struct Result {
u64 write_bps;
u64 read_bps;
};
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;
}
void exit_with_usage(int rc)
{
fprintf(stderr, "Usage: disk_benchmark [-h] [-d directory] [-t time_per_benchmark] [-f file_size1,file_size2,...] [-b block_size1,block_size2,...]\n");
exit(rc);
}
Result benchmark(const String& filename, int file_size, int block_size, ByteBuffer& buffer, bool allow_cache);
int main(int argc, char** argv)
{
char* directory = strdup(".");
int time_per_benchmark = 10;
Vector<int> file_sizes;
Vector<int> 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 = strdup(optarg);
break;
case 't':
time_per_benchmark = atoi(optarg);
break;
case 'f':
for (auto size : String(optarg).split(','))
file_sizes.append(atoi(size.characters()));
break;
case 'b':
for (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::format("%s/disk_benchmark.tmp", directory);
for (auto file_size : file_sizes) {
for (auto block_size : block_sizes) {
if (block_size > file_size)
continue;
auto buffer = ByteBuffer::create_uninitialized(block_size);
Vector<Result> results;
printf("Running: file_size=%d block_size=%d\n", file_size, block_size);
CElapsedTimer timer;
timer.start();
while (timer.elapsed() < time_per_benchmark * 1000) {
printf(".");
fflush(stdout);
results.append(benchmark(filename, file_size, block_size, buffer, allow_cache));
usleep(100);
}
auto average = average_result(results);
printf("\nFinished: runs=%d time=%dms write_bps=%llu read_bps=%llu\n", results.size(), timer.elapsed(), average.write_bps, average.read_bps);
sleep(1);
}
}
if (isatty(0)) {
printf("Press any key to exit...\n");
fgetc(stdin);
}
}
Result benchmark(const String& filename, int file_size, int block_size, ByteBuffer& buffer, bool allow_cache)
{
int flags = O_CREAT | O_TRUNC | O_WRONLY;
if (!allow_cache)
flags |= O_DIRECT;
int fd = open(filename.characters(), flags);
if (fd == -1) {
perror("open");
exit(1);
}
auto cleanup_and_exit = [fd, filename]() {
close(fd);
unlink(filename.characters());
exit(1);
};
Result res;
CElapsedTimer timer;
timer.start();
int nwrote = 0;
for (int j = 0; j < file_size; j += block_size) {
int n = write(fd, buffer.data(), block_size);
if (n < 0) {
perror("write");
cleanup_and_exit();
}
nwrote += n;
}
res.write_bps = (u64)(timer.elapsed() ? (file_size / timer.elapsed()) : file_size) * 1000;
if (lseek(fd, 0, SEEK_SET) < 0) {
perror("lseek");
cleanup_and_exit();
}
timer.start();
int nread = 0;
while (nread < file_size) {
int n = read(fd, buffer.data(), block_size);
if (n < 0) {
perror("read");
cleanup_and_exit();
}
nread += n;
}
res.read_bps = (u64)(timer.elapsed() ? (file_size / timer.elapsed()) : file_size) * 1000;
if (close(fd) != 0) {
perror("close");
cleanup_and_exit();
}
if (unlink(filename.characters()) != 0) {
perror("unlink");
cleanup_and_exit();
}
return res;
}
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