From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
Cc: | Christopher Browne <cbbrowne(at)acm(dot)org>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: shared_buffer optimization |
Date: | 2006-08-09 22:37:00 |
Message-ID: | 919.1155163020@sss.pgh.pa.us |
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Lists: | pgsql-performance |
"Jim C. Nasby" <jnasby(at)pervasive(dot)com> writes:
> Every single piece of advice I've seen on shared_buffers comes from the
> 7.x era, when our buffer management was extremely simplistic. IMO all of
> that knowledge was made obsolete when 8.0 came out, and our handling of
> shared_buffers has improved ever further since then. This is definately
> an area that could use a lot more testing.
Actually I think it was probably 8.1 that made the significant
difference there, by getting rid of the single point of contention
for shared-buffer management. I concur that 7.x-era rules of thumb
may well be obsolete --- we need some credible scaling tests ...
regards, tom lane
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