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pg_test_fsync (1) Linux Manual Page

ByLinux Manual Posted on

pg_test_fsync – determine fastest wal_sync_method for PostgreSQL

Synopsis

pg_test_fsync [option…]

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 difference in real database throughput, especially since many database servers are not speed-limited by their transaction logs.

Options

pg_test_fsync accepts the following command-line options:

-f, –filename

Specifies the file name to write test data in. This file should be in the same file system that the pg_xlog directory is or will be placed in. (pg_xlog contains the WAL files.) The default is pg_test_fsync.out in the current directory.

-s, –secs-per-test

Specifies the number of seconds for each test. The more time per test, the greater the test’s accuracy, but the longer it takes to run. The default is 2 seconds, which allows the program to complete in about 30 seconds.

-V, –version

Print the pg_test_fsync version and exit.

-?, –help

Show help about pg_test_fsync command line arguments, and exit.

Author

Bruce Momjian <bruce [at] momjian.us>

See Also

postgres(1)

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