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This commit is contained in:
Bruce Momjian 2001-01-19 18:19:34 +00:00
parent 7c89a5aa95
commit d239dfb4b0
1 changed files with 46 additions and 2 deletions
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@ -345,7 +345,7 @@ From owner-pgsql-hackers@hub.org Tue Oct 19 10:31:10 1999
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@ -695,3 +695,47 @@ LRU-2 idea and am not pursuing it.
regards, tom lane
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From: "Mikheev, Vadim" <vmikheev@SECTORBASE.COM>
To: "'Tom Lane'" <tgl@sss.pgh.pa.us>, Bruce Momjian <pgman@candle.pha.pa.us>
Cc: pgsql-hackers@postgresql.org
Subject: RE: [HACKERS] Possible performance improvement: buffer replacemen
t policy
Date: Fri, 19 Jan 2001 10:07:27 -0800
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Status: OR
> > Tom, did we ever test this? I think we did and found that
> > it was the same or worse, right?
>
> I tried it and didn't see any noticeable improvement on the particular
> test case I was using, so I got discouraged and didn't pursue the idea
> further. I'd like to come back to it someday, though.
I don't know how much useful could be LRU-2 but with WAL we should try
to reuse undirty free buffers first, not dirty ones, just to postpone
writes as long as we can. (BTW, this is what Oracle does.)
So, we probably should put new free dirty buffer just before first
undirty one in LRU.
Vadim