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Re: shared_buffers, work_mem and mantenance_work_mem in Windows

From: Howard Cole <howardnews(at)selestial(dot)com>
To: "pgsql-general(at)postgresql(dot)org List" <pgsql-general(at)postgresql(dot)org>
Subject: Re: shared_buffers, work_mem and mantenance_work_mem in Windows
Date: 2009-11-30 13:39:14
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general
Howard Cole wrote:
> Hi,
> I have not been able to use the tuning wizard in windows for 
> postgresql 8.4 since it stops postgres starting so I have been looking 
> to tweak the postgresql.conf file directly. I am happy with the 
> performance of postgres in general but I feel that it is not utilising 
> the memory on my servers to its full potential so I am looking for 
> some tweaks to get it turbo-charged.
> There seems to be little documentation on tuning these settings for a 
> Windows based machine and many of the performance tuning notes I have 
> found seem not to apply for version 8.4. One example of this is the 
> maintenance_work_mem which now runs out of memory if I set it to 
> values that I used for previous postgres builds (512MB).
> I have lots of unutilised RAM on my system, and so I try and increase 
> the shared_buffers on my server to 2GB, however postgres will not 
> start when the value is set this high, so at the moment it is set to 
> 512MB. Are there any optimal settings for this on windows.
> The third value I am experimenting with is work_mem, which at present 
> is set to 12MB - but memory still appears to be unused. I have a test 
> system with 3.5GB which rarely appears to go over 1GB and a production 
> server with 8GB which barely touches the RAM.
> I would really appreciate anyone pointing me in the right direction 
> with regards tuning an 8.4 based windows machine.
> Thanks.
I withdraw these comments. I've just found an excellent article here :

Which covers most things I need. I tend to avoid anything with WIKI in 
the title because it tends to be incomplete rubbish but the article by 
Greg Smith etc is excellent and has lots of detail for 8.4/Windows.


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