test_fsync open_sync test

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: test_fsync open_sync test
Date: 2011-01-17 16:02:21
Message-ID: 201101171602.p0HG2L000121@momjian.us
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Is there a value to this test_fsync test?

Compare open_sync with different sizes:
(This is designed to compare the cost of one large
sync'ed write and two smaller sync'ed writes.)
open_sync 16k write 242.563 ops/sec
2 open_sync 8k writes 752.752 ops/sec

It compares the cost of doing larger vs. two smaller open_sync writes.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +

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