1PG_TEST_FSYNC(1)        PostgreSQL 9.2.24 Documentation       PG_TEST_FSYNC(1)
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NAME

6       pg_test_fsync - determine fastest wal_sync_method for PostgreSQL
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SYNOPSIS

9       pg_test_fsync [option...]
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DESCRIPTION

12       pg_test_fsync is intended to give you a reasonable idea of what the
13       fastest wal_sync_method is on your specific system, as well as
14       supplying diagnostic information in the event of an identified I/O
15       problem. However, differences shown by pg_test_fsync might not make any
16       difference in real database throughput, especially since many database
17       servers are not speed-limited by their transaction logs.
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OPTIONS

20       pg_test_fsync accepts the following command-line options:
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22       -f, --filename
23           Specifies the file name to write test data in. This file should be
24           in the same file system that the pg_xlog directory is or will be
25           placed in. (pg_xlog contains the WAL files.) The default is
26           pg_test_fsync.out in the current directory.
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28       -s, --secs-per-test
29           Specifies the number of seconds for each test. The more time per
30           test, the greater the test's accuracy, but the longer it takes to
31           run. The default is 2 seconds, which allows the program to complete
32           in about 30 seconds.
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34       -V, --version
35           Print the pg_test_fsync version and exit.
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37       -?, --help
38           Show help about pg_test_fsync command line arguments, and exit.
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AUTHOR

41       Bruce Momjian <bruce@momjian.us>
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SEE ALSO

44       postgres(1)
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48PostgreSQL 9.2.24                 2017-11-06                  PG_TEST_FSYNC(1)
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