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tldr/pages/common/pg_test_fsync.md
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# pg_test_fsync
> Determine the fastest wal_sync_method on your system.
> More information: <https://www.postgresql.org/docs/current/pgtestfsync.html>.
- Run the default fsync benchmark (5 seconds):
`pg_test_fsync`
- Specify a custom test duration:
`pg_test_fsync {{[-s|--secs-per-test]}} {{seconds}}`
- Use a specific filename (it must be in same file system that the pg_wal directory is or will be placed in):
`pg_test_fsync {{[-f|--filename]}} {{path/to/file}}`