- unstable 14.5-2
|PostgreSQL 14.5 Documentation
pg_test_fsync - determine fastest wal_sync_method for PostgreSQL
pg_test_fsync is intended to give you a reasonable idea of what the fastest wal_sync_method is on your specific system, as well as supplying diagnostic information in the event of an identified I/O problem. However, differences shown by pg_test_fsync might not make any significant difference in real database throughput, especially since many database servers are not speed-limited by their write-ahead logs. pg_test_fsync reports average file sync operation time in microseconds for each wal_sync_method, which can also be used to inform efforts to optimize the value of commit_delay.
pg_test_fsync accepts the following command-line options:
The environment variable PG_COLOR specifies whether to use color in diagnostic messages. Possible values are always, auto and never.