Re: OT (slightly) swap limits
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On 04/26/08 18:13, Bob Proulx wrote:
[snip]
>
> I learned about this because I didn't know it when I set up a computer
> server pool to be used for some large memory consuming simulations.
> They all had 16G of RAM with 64-bit process space. I knew that if
> they started swapping that they would run to slowly for us and the
> plan was to avoid swapping. If they don't swap they don't need swap
> space and so I didn't configure any on them. I came from a Unix
> background and didn't expect this different behavior when running on
> Linux. We started to see processes randomly stop running. Nothing
> was ever logged from the log files for those processes. Large memory
> applications never recorded being out of memory. They just stopped
> running. A number of folks started cursing Linux for being unreliable
> and at that moment for us it was very unreliable! It was from that
> experience I learned about the Linux memory overcommit and oom killer
> behavior. And with that knowledge I knew that I needed to rebuild the
> computer server pool with overcommit off and enough VM.
>
[snip]
This was a very interesting post. Just now I modified sysconf and
boosted swap up to 2x RAM.
- --
Ron Johnson, Jr.
Jefferson LA USA
We want... a Shrubbery!!
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