CentOS 7.0 - man page for pg_test_fsync (centos section 1)
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PG_TEST_FSYNC(1) PostgreSQL 9.2.7 Documentation PG_TEST_FSYNC(1)
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 difference in real database throughput, especially since many database
servers are not speed-limited by their transaction logs.
pg_test_fsync accepts the following command-line options:
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.
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.
Print the pg_test_fsync version and exit.
Show help about pg_test_fsync command line arguments, and exit.
Bruce Momjian <email@example.com>
PostgreSQL 9.2.7 2014-02-17 PG_TEST_FSYNC(1)
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