test_fsync
==========
This program tests fsync. The tests are described as part of the program output.
Usage: test_fsync [option...]
Options:
-f, --filename specify filename for test
-o, --ops-per-test operations per test
test_fsync is intended to give you a reasonable idea of what the fastest
fsync_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 test_fsync might not make any difference in real
database throughput, especially since many database servers are not
speed-limited by their transaction logs.
The output filename defaults to test_fsync.out in the current directory.
test_fsync should be run in the same filesystem as your transaction log
directory (pg_xlog).
Operations per test defaults to 2000. Increase this to get more accurate
measurements.
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