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Re: Performance

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Claudio Freire <klaussfreire(at)gmail(dot)com>
Cc: Tomas Vondra <tv(at)fuzzy(dot)cz>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Performance
Date: 2011-04-26 05:30:58
Message-ID: D2F0DB51-7D42-4573-99CA-B72E28440B16@gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Apr 14, 2011, at 2:49 AM, Claudio Freire <klaussfreire(at)gmail(dot)com> wrote:
> This particular factor is not about an abstract and opaque "Workload"
> the server can't know about. It's about cache hit rate, and the server
> can indeed measure that.

The server can and does measure hit rates for the PG buffer pool, but to my knowledge there is no clear-cut way for PG to know whether read() is satisfied from the OS cache or a drive cache or the platter.

...Robert

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