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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