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f2fs_io: measure performance of write()

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Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2020-08-13 12:46:29 -07:00
parent 334047bdca
commit 1e3dd7ae5d
1 changed files with 29 additions and 1 deletions
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30
tools/f2fs_io/f2fs_io.c
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@ -130,6 +130,25 @@ static void full_write(int fd, const void *buf, size_t count)
}
}
#if defined(__APPLE__)
static u64 get_current_us()
{
#ifdef HAVE_MACH_TIME_H
return mach_absolute_time() / 1000;
#else
return 0;
#endif
}
#else
static u64 get_current_us()
{
struct timespec t;
t.tv_sec = t.tv_nsec = 0;
clock_gettime(CLOCK_BOOTTIME, &t);
return (u64)t.tv_sec * 1000000LL + t.tv_nsec / 1000;
}
#endif
#define fsync_desc "fsync"
#define fsync_help \
"f2fs_io fsync [file]\n\n" \
@ -434,6 +453,7 @@ static void do_write(int argc, char **argv, const struct cmd_desc *cmd)
unsigned bs, count, i;
int flags = 0;
int fd;
u64 total_time = 0, max_time = 0, max_time_t = 0;
srand(time(0));
@ -468,6 +488,7 @@ static void do_write(int argc, char **argv, const struct cmd_desc *cmd)
fd = xopen(argv[6], O_CREAT | O_WRONLY | flags, 0755);
total_time = get_current_us();
for (i = 0; i < count; i++) {
if (!strcmp(argv[4], "inc_num"))
*(int *)buf = inc_num++;
@ -475,13 +496,20 @@ static void do_write(int argc, char **argv, const struct cmd_desc *cmd)
*(int *)buf = rand();
/* write data */
max_time_t = get_current_us();
ret = pwrite(fd, buf, buf_size, offset + buf_size * i);
max_time_t = get_current_us() - max_time_t;
if (max_time < max_time_t)
max_time = max_time_t;
if (ret != buf_size)
break;
written += ret;
}
printf("Written %"PRIu64" bytes with pattern=%s\n", written, argv[4]);
printf("Written %"PRIu64" bytes with pattern=%s, total_time=%"PRIu64" us, max_latency=%"PRIu64" us\n",
written, argv[4],
get_current_us() - total_time,
max_time);
exit(0);
}