[Beowulf] disabling swap on cluster nodes?

[Mahmood Sayed]

Prentice, 

We regularly configure our compute nodes without any swap partition. There have been no adverse effects on the systems' performance under load. We're running clusters with everything from RHEL5/RHEL6 and the FOS variants thereof to several LTS versions of Ubuntu. RAM per node ranges from 32GB to 1TB. Jobs have run for several weeks without issue. 

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Mahmood A. Sayed
Sr Systems Programmer
Research Support
Pratt School of Engineering
Duke University
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> On Feb 6, 2015, at 5:35 PM, Prentice Bisbal <prentice.bisbal at rutgers.edu> wrote:
> 
> Do any of you disable swap on your compute nodes?
> 
> I brought this up in a presentation I gave last night on HPC system administration, but realized I never actually did this, or know of anyone who has. I would tweak the vm.overcommit_memory setting, but that's not the same as disabling swap altogether. I'd like to try doing this in the future, but I prefer to learn from someone else's mistakes first.
> 
> 
> -- 
> Prentice
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