pg_test_fsync
Description
pg_test_fsync is intended to give you a reasonable idea of what the fastestwal_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 bypg_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 eachwal_sync_method, which can also be used to inform efforts to optimize the value ofcommit_delay.
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 thepg_xlog directory is or will be placed in. (pg_xlog contains theWAL files.) The default ispg_test_fsync.out in the current directory.
- -s
--secs-per-testSpecifies 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 5 seconds, which allows the program to complete in under 2 minutes.
- -V
--versionPrint thepg_test_fsync version and exit.
- -?
--helpShow help aboutpg_test_fsync command line arguments, and exit.
- -s