Re: First set of OSDL Shared Mem scalability results, some

From: Matthew <matthew(at)zeut(dot)net>
To: Christopher Browne <cbbrowne(at)acm(dot)org>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: First set of OSDL Shared Mem scalability results, some
Date: 2004-10-09 15:02:09
Message-ID: 4167FD71.9050501@zeut.net
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Christopher Browne wrote:

>josh(at)agliodbs(dot)com (Josh Berkus) wrote:
>
>
>>This result is so surprising that I want people to take a look at it
>>and tell me if there's something wrong with the tests or some
>>bottlenecking factor that I've not seen.
>>
>>
>I'm aware of two conspicuous scenarios where ARC would be expected to
>_substantially_ improve performance:
>
> 1. When it allows a VACUUM not to throw useful data out of
> the shared cache in that VACUUM now only 'chews' on one
> page of the cache;
>

Right, Josh, I assume you didn't run these test with pg_autovacuum
running, which might be interesting.

Also how do these numbers compare to 7.4? They may not be what you
expected, but they might still be an improvment.

Matthew

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