April 2018
Intermediate to advanced
508 pages
15h 22m
English
Content preview from PostgreSQL 10 High Performance - Third Edition
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PostgreSQL test_fsync
In a source code build of PostgreSQL, the src/tools/fsync directory contains a program named test_fsync that might also be included in some packaged versions. This aims to test the commit rate for each of the ways a given PostgreSQL install might commit records to disk. Unfortunately, this program doesn't give results consistent with other tests, and before PostgreSQL 9.0 it's in the wrong units (elapsed times instead of operations per second). Until it's improved a bit further, its output can't be relied upon.
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, ...
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