Message-ID: <557C6BA8.7030805@commandprompt.com>
Date: Sat, 13 Jun 2015 10:43:04 -0700
From: "Joshua D. Drake" <jd@commandprompt.com>
Organization: Command Prompt, Inc.
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To: Kaijiang Chen <chenkaijiang@gmail.com>,
 "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Do work_mem and shared buffers have 1g or 2g limit
 on 64 bit linux?
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On 06/13/2015 10:27 AM, Kaijiang Chen wrote:
> Hi, I am using postgresql 9.2.10 on centos 6.2, 64 bit version. The
> server has 512 GB mem.
>
> The jobs are mainly OLAP like. So I need larger work_mem and shared
> buffers. From the source code, there is a constant MaxAllocSize==1GB.
> So, I wonder whether work_mem and shared buffers can exceed 2GB in the
> 64 bit Linux server?

Shared Buffers is not limited.

Work_mem IIRC can go past 2GB but has never been proven to be effective 
after that.

It does depend on the version you are running.

JD


>
> Thanks and regards,
> Kaijiang
>


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