On 2025/6/13 12:02, Daniel Lee wrote:
A new command 'create_speed', has been introduced to measure
the performance of creating and deleting many files.
Signed-off-by: Daniel Lee <chul...@google.com>
---
tools/f2fs_io/f2fs_io.c | 112 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 6531b55..ea6a3ff 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -2092,6 +2092,117 @@ static void do_ftruncate(int argc, char **argv, const
struct cmd_desc *cmd)
exit(0);
}
+#define create_speed_desc "create_speed a file"
+#define create_speed_help \
+"f2fs_io create_speed [dir] [num_files] [size_kb]\n\n" \
+"Measures file creation and deletion performance.\n"
+
+static void do_create_speed(int argc, char **argv, const struct cmd_desc *cmd)
+{
+ if (argc != 4) {
+ fputs("Usage: f2fs_io create_latency <directory> <num_files>
[size_kb]\n", stderr);
+ fputs(cmd->cmd_help, stderr);
+ exit(1);
+ }
+
+ const char *dir = argv[1];
+ int num_files = atoi(argv[2]);
+ int size_kb = atoi(argv[3]);
+ char *write_buffer = NULL;
+
+ if (num_files <= 0) {
+ fprintf(stderr, "Error: Number of files must be positive.\n");
+ exit(1);
+ }
+
+ if (size_kb > 0) {
+ write_buffer = malloc(size_kb * 1024);
+ if (!write_buffer) {
+ perror("Failed to allocate write buffer");
+ exit(1);
+ }
+ memset(write_buffer, 'a', size_kb * 1024);
+ }
+
+ // Creation Phase
+ printf("Starting test: Creating %d files of %dKB each in %s\n",
num_files, size_kb, dir);
+
+ struct timespec create_start, create_end;
+
+ clock_gettime(CLOCK_MONOTONIC, &create_start);
+
+ for (int i = 0; i < num_files; i++) {
+ char path[1024];
+
+ snprintf(path, sizeof(path), "%s/test_file_%d", dir, i);
+
+ int fd = open(path, O_WRONLY | O_CREAT, 0644);
+
+ if (fd < 0) {
+ perror("Error opening file");
+ continue;
+ }
+ if (size_kb > 0) {
+ if (write(fd, write_buffer, size_kb * 1024) < 0)
+ perror("Error writing to file");
+ }
+ if (fsync(fd) < 0)
Maybe we need to call fsync() optionally, as if we want to find and
notice performance regression comes from create, we'd better avoid
distraction from disk IO.
Thanks,
+ perror("Error fsyncing file");
+
+ close(fd);
+ }
+
+ clock_gettime(CLOCK_MONOTONIC, &create_end);
+
+
+ // Deletion Phase
+ printf("Deleting %d created files...\n", num_files);
+
+ struct timespec del_start, del_end;
+
+ clock_gettime(CLOCK_MONOTONIC, &del_start);
+
+ for (int i = 0; i < num_files; i++) {
+ char path[1024];
+
+ snprintf(path, sizeof(path), "%s/test_file_%d", dir, i);
+ if (unlink(path) != 0)
+ perror("Error unlinking file");
+ }
+ sync();
+
+ clock_gettime(CLOCK_MONOTONIC, &del_end);
+
+ long create_seconds = create_end.tv_sec - create_start.tv_sec;
+ long create_ns = create_end.tv_nsec - create_start.tv_nsec;
+ double create_time_s = (double)create_seconds + (double)create_ns /
1000000000.0;
+ double create_throughput = (create_time_s > 0) ? (num_files /
create_time_s) : 0;
+
+ long del_seconds = del_end.tv_sec - del_start.tv_sec;
+ long del_ns = del_end.tv_nsec - del_start.tv_nsec;
+ double del_time_s = (double)del_seconds + (double)del_ns / 1000000000.0;
+ double del_throughput = (del_time_s > 0) ? (num_files / del_time_s) : 0;
+
+
printf("Operation,total_files,file_size_kb,total_time_s,throughput_files_per_sec\n");
+
+ printf("CREATE,%d,%d,%.4f,%.2f\n",
+ num_files,
+ size_kb,
+ create_time_s,
+ create_throughput);
+
+ printf("DELETE,%d,%d,%.4f,%.2f\n",
+ num_files,
+ size_kb,
+ del_time_s,
+ del_throughput);
+
+ if (write_buffer)
+ free(write_buffer);
+
+ exit(0);
+}
+
#define CMD_HIDDEN 0x0001
#define CMD(name) { #name, do_##name, name##_desc, name##_help, 0 }
#define _CMD(name) { #name, do_##name, NULL, NULL, CMD_HIDDEN }
@@ -2140,6 +2251,7 @@ const struct cmd_desc cmd_list[] = {
CMD(get_advise),
CMD(ioprio),
CMD(ftruncate),
+ CMD(create_speed),
{ NULL, NULL, NULL, NULL, 0 }
};
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