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f2fs_io: add more options for randread test

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This patch improves the randread test:
 - add mmap
 - add fadvise option
 - show performance results

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2024-11-01 17:56:09 +00:00
parent 036af19f6d
commit 05fde8ed32
1 changed files with 49 additions and 11 deletions
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60
tools/f2fs_io/f2fs_io.c
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@ -952,24 +952,31 @@ static void do_read(int argc, char **argv, const struct cmd_desc *cmd)
#define randread_desc "random read data from file"
#define randread_help \
"f2fs_io randread [chunk_size in 4kb] [count] [IO] [file_path]\n\n" \
"f2fs_io randread [chunk_size in 4kb] [count] [IO] [advise] [file_path]\n\n" \
"Do random read data in file_path\n" \
"IO can be\n" \
" buffered : buffered IO\n" \
" dio : direct IO\n" \
" mmap : mmap IO\n" \
"advice can be\n" \
" 1 : set random|willneed\n" \
" 0 : none\n" \
static void do_randread(int argc, char **argv, const struct cmd_desc *cmd)
{
u64 buf_size = 0, ret = 0, read_cnt = 0;
u64 idx, end_idx, aligned_size;
char *buf = NULL;
unsigned bs, count, i;
char *data;
unsigned bs, count, i, j;
u64 total_time = 0, elapsed_time = 0;
int flags = 0;
int fd;
int do_mmap = 0;
int fd, advice;
time_t t;
struct stat stbuf;
if (argc != 5) {
if (argc != 6) {
fputs("Excess arguments\n\n", stderr);
fputs(cmd->cmd_help, stderr);
exit(1);
@ -985,10 +992,21 @@ static void do_randread(int argc, char **argv, const struct cmd_desc *cmd)
count = atoi(argv[2]);
if (!strcmp(argv[3], "dio"))
flags |= O_DIRECT;
else if (!strcmp(argv[3], "mmap"))
do_mmap = 1;
else if (strcmp(argv[3], "buffered"))
die("Wrong IO type");
fd = xopen(argv[4], O_RDONLY | flags, 0);
fd = xopen(argv[5], O_RDONLY | flags, 0);
advice = atoi(argv[4]);
if (advice) {
if (posix_fadvise(fd, 0, stbuf.st_size, POSIX_FADV_RANDOM) != 0)
die_errno("fadvise failed");
if (posix_fadvise(fd, 0, 4096, POSIX_FADV_WILLNEED) != 0)
die_errno("fadvise failed");
printf("fadvise RANDOM|WILLNEED to a file: %s\n", argv[5]);
}
if (fstat(fd, &stbuf) != 0)
die_errno("fstat of source file failed");
@ -998,18 +1016,38 @@ static void do_randread(int argc, char **argv, const struct cmd_desc *cmd)
die("File is too small to random read");
end_idx = (u64)(aligned_size - buf_size) / (u64)F2FS_DEFAULT_BLKSIZE + 1;
if (do_mmap) {
data = mmap(NULL, stbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (data == MAP_FAILED)
die("Mmap failed");
if (madvise((void *)data, stbuf.st_size, MADV_RANDOM) != 0)
die_errno("madvise failed");
}
srand((unsigned) time(&t));
total_time = get_current_us();
for (i = 0; i < count; i++) {
idx = rand() % end_idx;
ret = pread(fd, buf, buf_size, F2FS_DEFAULT_BLKSIZE * idx);
if (ret != buf_size)
break;
read_cnt += ret;
if (!do_mmap) {
ret = pread(fd, buf, buf_size, 4096 * idx);
if (ret != buf_size)
break;
} else {
for (j = 0; j < bs; j++)
*buf = data[4096 * (idx + j)];
}
read_cnt += buf_size;
}
printf("Read %"PRIu64" bytes\n", read_cnt);
elapsed_time = get_current_us() - total_time;
printf("Read %"PRIu64" bytes total_time = %"PRIu64" us, avg. latency = %.Lf us, IOPs= %.Lf, BW = %.Lf MB/s\n",
read_cnt, elapsed_time,
(long double)elapsed_time / count,
(long double)count * 1000 * 1000 / elapsed_time,
(long double)read_cnt / elapsed_time);
exit(0);
}