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Add microsecs/op display to pg_test_fsync utility

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e.g. fsync  2103.613 ops/sec (   475 microsecs/op)

Peter Geoghegan
This commit is contained in:
Simon Riggs
2012-10-09 08:15:23 +01:00
parent bc433317ae
commit 82e429794b
2 changed files with 12 additions and 7 deletions
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13
doc/src/sgml/pgtestfsync.sgml
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@ -30,11 +30,14 @@
<application>pg_test_fsync</> is intended to give you a reasonable
idea of what the fastest <xref linkend="guc-wal-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 by <application>pg_test_fsync</application>
might not make any difference in real database throughput, especially
since many database servers are not speed-limited by their transaction
logs.
as well as supplying diagnostic information in the event of an identified I/O
problem. However, differences shown by
<application>pg_test_fsync</application> might not make any significant
difference in real database throughput, especially since many database servers
are not speed-limited by their transaction logs.
<application>pg_test_fsync</application> reports average file sync operation
time in microseconds for each wal_sync_method, which can be used to inform
efforts to optimize the value of <varname>commit_delay</varname>.
</para>
</refsect1>