[rhn-users] Swap partitions on Very Large Memory systems

[Brian Smith]

PJ,

I went for a 4 GB swap partition for my Quad Opteron with 32GB of RAM.

Reasons:

1. The Machine is used to run large-memory, fine-grained parallel
applications and I want my user(s) to be able to use every bit of memory
they can get their hands on... This means

2. that system processes must be swapped out of RAM for user's
simulations to be able to use every little bit.  I've run into scenarios
where an app would use just a few KB under 32GB.

3.  Sometimes a job run will go over the 32GB limit for a short period
of time.  In this case, it is important to have sufficiently ample swap
space, on a separate drive no less, so that our users can have some
temporary flexibility.  I don't want a job that uses 33GB of RAM for
maybe 10 minutes SEGFAULTing just because I refused to allow swap.

Hope this helps.

-Brian Smith

On Fri, 2005-09-30 at 13:07 -0400, Juels, Philip wrote:
> Hi all,
> 
>  
> 
> I’ve got an HP rx4640 (quad-Itanium system) with 40GB RAM.  What’s the
> recommended swap partition scheme for such VLM systems?  With a limit
> of 2GB and 32 swap partitions (according to RH admin guides), clearly
> I can’t setup an 80GB+ swap scheme.  Is not having a swap partition a
> possibility?
> 
>  
> 
> Thanks
> 
>  
> 
> PJ
> 
> 
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