Re: Increasing RAM for more than 4 Gb. using postgresql

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Cc: William Yu <wyu(at)talisys(dot)com>
Subject: Re: Increasing RAM for more than 4 Gb. using postgresql
Date: 2005-01-16 17:44:47
Message-ID: 200501160944.47511.josh@agliodbs.com
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William,

> The theshold for using PAE is actually far lower than 4GB. 4GB is the
> total memory address space -- split that in half for 2GB for userspace,
> 2GB for kernel. The OS cache resides in kernel space -- after you take
> alway the memory allocation for devices, you're left with a window of
> roughly 900MB.

I'm curious, how do you get 1.1GB for memory allocation for devices?

--
Josh Berkus
Aglio Database Solutions
San Francisco

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