- stretch 9.6.12-0+deb9u1
|PG_TEST_FSYNC(1)||PostgreSQL 9.6.12 Documentation||PG_TEST_FSYNC(1)|
NAME¶pg_test_fsync - determine fastest wal_sync_method for PostgreSQL
DESCRIPTION¶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 transaction 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.
OPTIONS¶pg_test_fsync accepts the following command-line options: