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CentOS 7.0 - man page for pg_test_fsync (centos section 1)

PG_TEST_FSYNC(1)					  PostgreSQL 9.2.7 Documentation					  PG_TEST_FSYNC(1)

NAME
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@momjian.us>
SEE ALSO
postgres(1) PostgreSQL 9.2.7 2014-02-17 PG_TEST_FSYNC(1)