| From: | Rod Taylor <pg(at)rbt(dot)ca> |
|---|---|
| To: | Marty Scholes <marty(at)outputservices(dot)com> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: WAL write of full pages |
| Date: | 2004-03-15 21:18:37 |
| Message-ID: | 1079385516.33643.7.camel@jester |
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| Thread: | |
| Lists: | pgsql-hackers |
> I suspect (but cannot prove) that performance would jump for systems
> like ours if WAL was done away with entirely and the individual data
> files were synchronized on commit.
You know.. thats exactly what WAL is designed to prevent? Grab a copy of
7.0 and 7.1. Do a benchmark between the 2 with fsync on in both cases.
I think you'll find one is about 50% faster than the other on a single
disk system, and about the same if you have gobs of battery backed write
cache.
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