[f2fs-dev] [PATCH] f2fs_io: add create_speed command

[Daniel Lee via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

A new command 'create_speed', has been introduced to measure
the performance of creating and deleting many files.

Signed-off-by: Daniel Lee <chullee@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)
+			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 }
 };
 
-- 
2.50.0.rc1.591.g9c95f17f64-goog



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