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Re: Sharedbuffers and WorkMem - Mailing list pgsql-general

From Grzegorz Jaśkiewicz
Subject Re: Sharedbuffers and WorkMem
Date
Msg-id 2f4958ff0910200834m1f5fc4ah31455feb780a56e7@mail.gmail.com
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In response to Sharedbuffers and WorkMem  (Waldomiro <waldomiro@shx.com.br>)
List pgsql-general
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On Tue, Oct 20, 2009 at 4:22 PM, Waldomiro <waldomiro@shx.com.br> wrote:
Hi everybody,

I have some doubts about sharedmemory and work_mem.

I have a server:

64 GB RAM
2 processors 4 cores each one intel xeon 3 Ghz
expecting 300 users in the same time

So, I put in sharedbuffers the same size my two biggest tables, which are the most read too. 11 GB + 4 GB. total shared buffers = 15 GB

After that I put 100 MB to each expected user, 300 * 100 MB = 30 GB

So, I used only 30 GB + 15GB = 45 GB total RAM

My doubt is, can I use more RAM for shared buffers? about 30 GB (50% of total RAM)?

What is the max shared buffers I can use? How can I calculate that?

what's the db version? what OS ?
have you tried pgtune ? (if db 8.3 or 8.4)
 


--
GJ

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