[Beowulf] size of swap partition

[Gerry Creager]

Misha,

We have the potential to have to swap whole jobs out of memory on a 
complete node.  As a result, I recommend 1.5-2.0 times memory in swap if 
this is a consideration.  I do know there's likely to be a bit of 
discussion as this varies widely from site to site and based on 
requirements.

gerry

Mikhail Kuzminsky wrote:
> A lot of time ago it was formulated simple rule for swap partition size
> (equal to main memory size).
> 
> Currently we all have relative large RAM on the nodes (typically, I 
> beleive, it is 2 or more GB per core; we have 16 GB per dual-socket 
> quad-core Opteron node). What is typical modern swap size today?
> 
> I understand that it depends from applications ;-) We, in particular, 
> practically don't have jobs which run "out-of-RAM". For single core 
> dual-socket Opteron nodes w/4GB RAM per node and "molecular modelling 
> workload" we used 4 GB swap partition.
> 
> But what are the reccomendations of modern praxis ?
> 
> Mikhail Kuzminksy
> Computer Assistance to Chemical Research Center
> Zelinsky Inst. of Organic Chemistry
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
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