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Re: work_mem and shared_buffers

From: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
To: "Campbell, Lance" <lance(at)uiuc(dot)edu>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: work_mem and shared_buffers
Date: 2007-11-09 17:56:30
Message-ID: 47349F4E.5070204@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-performance
Campbell, Lance wrote:
> Does the amount of memory allocate to work_mem get subtracted from
> shared_buffers?
> 
> Example:
> 
> If work_mem is 1M and there are 10 connections and shared_buffers is
> 100M then would the total be 90 M left for shared_buffers?
> 
> Or does the amount of memory allocated for work_mem have nothing to do
> with shared_buffers?

No, they're completely separate.

Note that a connection can use more than work_mem of memory. For 
example, if you run a query with multiple Sort or hash-nodes, each such 
node allocates up to work_mem of memory.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

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