[Beowulf] Question: Who has apps that regularly swap?

Michael Will mwill at penguincomputing.com
Sun Aug 29 22:05:00 EDT 2004


And then there are priority queues which allow newer high priority
jobs to push aside lower priority jobs. They do not get canceled though
but just SIGSTPed so that they can be resumed when the highpriority
job is done. 

Those would typically end up in swap until resumed, rather than reside
in physical memory.

Michael
On Sunday 29 August 2004 06:09 pm, Glen Gardner wrote:
> In general, swapping is to be avoided. Typically , swapping begins when 
> the machine runs short of memory (usually due to an application using 
> too much memory during it's run).  A cluster with many nodes swapping is 
> said to be "thrashing" and is operating very inefficiently. In that 
> situation the cluster might begin to run so slowly as to be useless.  A 
> program that causes swapping for long periods of time generally makes me 
> worry about the life expectancy of the hard drives as well.
> 
> Glen
> 
> 
> Jeffrey B. Layton wrote:
> 
> > Hello,
> >
> >  I've been wanting to ask this question for some time. I'm wondering
> > who has apps that regularly swap? Is it because the nodes don't have
> > enough memory (i.e. haven't filled up all of the slots) or because the
> > app just uses a lot of memory? Is it only when the app starts up, shuts
> > down, or periodically when it is running?
> >
> > Thanks!
> >
> > Jeff
> >
> > _______________________________________________
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> >
> 

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