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postgresql/src/tools/fsync
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Bruce Momjian 3ab80cfe03 Improve output display of test_fsync.
2011-01-15 12:24:05 -05:00
..
Makefile Apply patch for test_fsync to add tests for O_DIRECT. 2011-01-15 11:55:13 -05:00
README Apply patch for test_fsync to add tests for O_DIRECT. 2011-01-15 11:55:13 -05:00
test_fsync.c Improve output display of test_fsync. 2011-01-15 12:24:05 -05:00

README 

test_fsync
==========

This program tests fsync.  The tests are described as part of the program output.

	Usage:	test_fsync [-f filename] [loops]
	
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).

Loops default to 2000.  Increase this to get more accurate measurements.