Re: [f2fs-dev] [PATCH v3] f2fs_io: add test_create_perf command

[Chao Yu via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

On 7/14/25 22:23, Jaegeuk Kim wrote:
> On 07/14, Chao Yu wrote:
>> Daniel,
>>
>> It missed to add doc entry, just found the issue.
> 
> Can you post another patch to update the doc?

Sure. :)

Thanks,

> 
>>
>> Thanks,
>>
>> On 6/17/25 22:04, Daniel Lee wrote:
>>> A new command 'test_create_perf', has been introduced to measure
>>> the performance of creating and deleting many files.
>>>
>>> Signed-off-by: Daniel Lee <chullee@google.com>
>>> ---
>>> v3: make sync optional for deletion phase
>>> v2: Rename command and make fsync optional
>>> ---
>>>  tools/f2fs_io/f2fs_io.c | 146 ++++++++++++++++++++++++++++++++++++++++
>>>  1 file changed, 146 insertions(+)
>>>
>>> diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
>>> index 6531b55..f6649f1 100644
>>> --- a/tools/f2fs_io/f2fs_io.c
>>> +++ b/tools/f2fs_io/f2fs_io.c
>>> @@ -2092,6 +2092,151 @@ static void do_ftruncate(int argc, char **argv, const struct cmd_desc *cmd)
>>>  	exit(0);
>>>  }
>>>  
>>> +#define test_create_perf_desc "measure file creation speed"
>>> +#define test_create_perf_help						\
>>> +"f2fs_io test_create_perf [-s] [-S] <dir> <num_files> <size_kb>\n\n"	\
>>> +"Measures file creation and deletion performance.\n"			\
>>> +"  <dir>          The target directory where files will be created.\n"	\
>>> +"  <num_files>    The total number of files to create and delete.\n"	\
>>> +"  <size_kb>      The size of each file in kb.\n"			\
>>> +"  [-s]           Call fsync() after each file creation.\n"		\
>>> +"  [-S]           Call sync() after deleting all files.\n"
>>> +
>>> +static void do_test_create_perf(int argc, char **argv, const struct cmd_desc *cmd)
>>> +{
>>> +	bool do_fsync = false, do_sync = false;
>>> +	int opt;
>>> +	char *dir;
>>> +	int num_files;
>>> +	int size_kb;
>>> +	char *write_buffer = NULL;
>>> +
>>> +	while ((opt = getopt(argc, argv, "sS")) != -1) {
>>> +		switch (opt) {
>>> +		case 's':
>>> +			do_fsync = true;
>>> +			break;
>>> +		case 'S':
>>> +			do_sync = true;
>>> +			break;
>>> +		default:
>>> +			fputs(cmd->cmd_help, stderr);
>>> +			exit(1);
>>> +		}
>>> +	}
>>> +
>>> +	argc -= optind;
>>> +	argv += optind;
>>> +
>>> +	if (argc != 3) {
>>> +		fputs("Excess arguments\n\n", stderr);
>>> +		fputs(cmd->cmd_help, stderr);
>>> +		exit(1);
>>> +	}
>>> +
>>> +	dir = argv[0];
>>> +	num_files = atoi(argv[1]);
>>> +	size_kb = atoi(argv[2]);
>>> +
>>> +	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 (fsync: %s)\n",
>>> +		num_files, size_kb, dir,
>>> +		do_fsync ? "Enabled" : "Disabled");
>>> +
>>> +	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 (do_fsync)
>>> +			fsync(fd);
>>> +
>>> +		close(fd);
>>> +	}
>>> +
>>> +	clock_gettime(CLOCK_MONOTONIC, &create_end);
>>> +
>>> +
>>> +	// Deletion Phase
>>> +	printf("Deleting %d created files (sync: %s)\n", num_files,
>>> +		do_sync ? "Enabled" : "Disabled");
>>> +
>>> +	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");
>>> +	}
>>> +
>>> +	if (do_sync)
>>> +		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 +2285,7 @@ const struct cmd_desc cmd_list[] = {
>>>  	CMD(get_advise),
>>>  	CMD(ioprio),
>>>  	CMD(ftruncate),
>>> +	CMD(test_create_perf),
>>>  	{ NULL, NULL, NULL, NULL, 0 }
>>>  };
>>>  



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