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

[Glen Gardner]

Jeffrey;

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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-- 
Glen E. Gardner, Jr.
AA8C
AMSAT MEMBER 10593
Glen.Gardner at verizon.net


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