linux-kernel - Simple utility to measure disk random access time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <ceccffee0701160649w5e401cf9i433f61beeb26e2b1@mail.gmail.com>
Date:	Tue, 16 Jan 2007 15:49:45 +0100
From:	"Linux Portal" <linportal@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Simple utility to measure disk random access time

And a few graphs here: http://linux.inet.hr/how_fast_is_your_disk.html

Comments welcome!

#define _LARGEFILE64_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <signal.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <linux/fs.h>

#define BLOCKSIZE 512
#define TIMEOUT 30

int count;
time_t start;

void done()
{
	time_t end;

	time(&end);

	if (end < start + TIMEOUT) {
		printf(".");
		alarm(1);
		return;
	}

	if (count) {
	  printf(".\nResults: %d seeks/second, %.2f ms random access time\n",
		 count / TIMEOUT, 1000.0 * TIMEOUT / count);
	}
	exit(EXIT_SUCCESS);
}

void handle(const char *string, int error)
{
	if (error) {
		perror(string);
		exit(EXIT_FAILURE);
	}
}

int main(int argc, char **argv)
{
	char buffer[BLOCKSIZE];
	int fd, retval;
	unsigned long numblocks;
	off64_t offset;

	setvbuf(stdout, NULL, _IONBF, 0);

	printf("Seeker v2.0, 2007-01-15, "
	       "http://linux.inet.hr/how_fast_is_your_disk.html\n");

	if (argc != 2) {
		printf("Usage: seeker <raw disk device>\n");
		exit(EXIT_SUCCESS);
	}

	fd = open(argv[1], O_RDONLY);
	handle("open", fd < 0);

	retval = ioctl(fd, BLKGETSIZE, &numblocks);
	handle("ioctl", retval == -1);
	printf("Benchmarking %s [%luMB], wait %d seconds",
	       argv[1], numblocks / 2048, TIMEOUT);

	time(&start);
	srand(start);
	signal(SIGALRM, &done);
	alarm(1);

	for (;;) {
		offset = (off64_t) numblocks * random() / RAND_MAX;
		retval = lseek64(fd, BLOCKSIZE * offset, SEEK_SET);
		handle("lseek64", retval == (off64_t) -1);
		retval = read(fd, buffer, BLOCKSIZE);
		handle("read", retval < 0);
		count++;
	}
	/* notreached */
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/