From: | Richard Huxton <dev(at)archonet(dot)com> |
---|---|
To: | sthomas(at)optionshouse(dot)com |
Cc: | PostgreSQL General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Noticed something odd with pgbench |
Date: | 2012-11-16 19:59:49 |
Message-ID: | 50A69B35.4040909@archonet.com |
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Thread: | |
Lists: | pgsql-general |
On 16/11/12 19:35, Shaun Thomas wrote:
> Hey guys,
>
> So, we have a pretty beefy system that runs dual X5675's with 72GB of
> RAM. After our recent upgrade to 9.1, things have been... odd. I
> managed to track it down to one setting:
>
> shared_buffers = 8GB
>
> It does the same thing at 6GB. 4GB is safe for hours on end, but 6GB
> and 8GB implode within in minutes. During this, kswapd goes crazy
> paging out the cache, at the same time it's reading from disk to put
> them back in. It's like I fed the kernel poison or something.
>
> Has anybody else noticed something like this? I got this behavior with
> 9.1.6 on a 3.2 kernel. No amount of tweaks in /proc/sys/vm changed
> anything either, so I'm not convinced it's a NUMA problem.
>
Does this match what you're seeing?
http://frosty-postgres.blogspot.co.uk/2012/08/postgresql-numa-and-zone-reclaim-mode.html
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