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/*
* Copyright (C) 2007 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Author: Adrian Hunter
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>
#include <limits.h>
#include "tests.h"
#define BLOCK_SIZE 32 * 1024
struct timeval tv_start;
struct timeval tv_stop;
static inline void start_timer(void)
{
CHECK(gettimeofday(&tv_start, NULL) != -1);
}
static inline long long stop_timer(void)
{
long long usecs;
CHECK(gettimeofday(&tv_stop, NULL) != -1);
usecs = (tv_stop.tv_sec - tv_start.tv_sec);
usecs *= 1000000;
usecs += tv_stop.tv_usec;
usecs -= tv_start.tv_usec;
return usecs;
}
static unsigned speed(size_t bytes, long long usecs)
{
unsigned long long k;
k = bytes * 1000000ULL;
k /= usecs;
k /= 1024;
CHECK(k <= UINT_MAX);
return (unsigned) k;
}
static void perf(void)
{
pid_t pid;
int fd, i;
ssize_t written, readsz;
size_t remains, block, actual_size;
char file_name[256];
unsigned char *buf;
long long write_time, unmount_time, mount_time, read_time;
/* Sync all file systems */
sync();
/* Make random data to write */
buf = malloc(BLOCK_SIZE);
CHECK(buf != NULL);
pid = getpid();
srand(pid);
for (i = 0; i < BLOCK_SIZE; i++)
buf[i] = rand();
/* Open file */
tests_cat_pid(file_name, "perf_test_file_", pid);
start_timer();
fd = open(file_name, O_CREAT | O_RDWR | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
CHECK(fd != -1);
CHECK(tests_size_parameter > 0);
CHECK(tests_size_parameter <= SIZE_MAX);
/* Write to file */
actual_size = 0;
remains = tests_size_parameter;
while (remains > 0) {
if (remains > BLOCK_SIZE)
block = BLOCK_SIZE;
else
block = remains;
written = write(fd, buf, block);
if (written <= 0) {
CHECK(errno == ENOSPC); /* File system full */
errno = 0;
break;
}
remains -= written;
actual_size += written;
}
CHECK(fsync(fd) != -1);
CHECK(close(fd) != -1);
write_time = stop_timer();
/* Unmount */
start_timer();
tests_unmount();
unmount_time = stop_timer();
/* Mount */
start_timer();
tests_mount();
mount_time = stop_timer();
/* Open file, read it, and close it */
start_timer();
fd = open(file_name, O_RDONLY);
CHECK(fd != -1);
remains = actual_size;
while (remains > 0) {
if (remains > BLOCK_SIZE)
block = BLOCK_SIZE;
else
block = remains;
readsz = read(fd, buf, block);
CHECK(readsz == block);
remains -= readsz;
}
CHECK(close(fd) != -1);
read_time = stop_timer();
CHECK(unlink(file_name) != -1);
/* Display timings */
printf("File system read and write speed\n");
printf("================================\n");
printf("Specfied file size: %lld\n",
(unsigned long long)tests_size_parameter);
printf("Actual file size: %zu\n", actual_size);
printf("Write time (us): %lld\n", write_time);
printf("Unmount time (us): %lld\n", unmount_time);
printf("Mount time (us): %lld\n", mount_time);
printf("Read time (us): %lld\n", read_time);
printf("Write speed (KiB/s): %u\n", speed(actual_size, write_time));
printf("Read speed (KiB/s): %u\n", speed(actual_size, read_time));
printf("Test completed\n");
}
/* Title of this test */
static const char *perf_get_title(void)
{
return "Measure file system read and write speed";
}
/* Description of this test */
static const char *perf_get_description(void)
{
return
"Syncs the file system (a newly created empty file system is " \
"preferable). Creates a file named perf_test_file_pid, where " \
"pid is the process id. The file is filled with random data. " \
"The size of the file is given by the -z or --size option, " \
"otherwise it defaults to 10MiB. Unmounts the file system. " \
"Mounts the file system. Reads the entire file in 32KiB size " \
"blocks. Displays the time taken for each activity. Deletes " \
"the file. Note that the file is synced after writing and " \
"that time is included in the write time and speed.";
}
int main(int argc, char *argv[])
{
int run_test;
/* Set default test file size */
tests_size_parameter = 10 * 1024 * 1024;
/* Handle common arguments */
run_test = tests_get_args(argc, argv, perf_get_title(),
perf_get_description(), "z");
if (!run_test)
return 1;
/* Change directory to the file system and check it is ok for testing */
tests_check_test_file_system();
/* Do the actual test */
perf();
return 0;
}
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