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Re: Bgwriter LRU cleaning: we've been going at this all wrong

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Gregory Stark <stark(at)enterprisedb(dot)com>
Cc: "Greg Smith" <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Bgwriter LRU cleaning: we've been going at this all wrong
Date: 2007-06-27 15:17:42
Message-ID: 19037.1182957462@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Gregory Stark <stark(at)enterprisedb(dot)com> writes:
> If we find it's overkill then what we should consider doing is raising
> BM_MAX_USAGE_COUNT. That's effectively tuning the percentage of the lru chain
> that we decide we try to keep clean.

Yeah, I don't believe anyone has tried to do performance testing for
different values of BM_MAX_USAGE_COUNT.  It would be interesting to
try that after all the dust settles.

			regards, tom lane

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