[Beowulf] Determining NFS usage by user on a cluster

Robert G. Brown rgb at phy.duke.edu
Wed Apr 19 16:39:01 EDT 2006


On Wed, 19 Apr 2006, Konstantin Kudin wrote:

> Hi all,
>
> Is there any good solution to find out which user is loading the NFS
> the most in a cluster configuration?
>
> Basically, a bunch of nodes are hooked up to an NFS server, and when
> somebody forgets to use the local scratch space for a job, the system
> slows down to a crawl.
>
> So figuring out who is doing that would be extremely helpful.
>
> Thanks!
> Konstantin

If you install e.g. xmlsysd/wulfstat/wulflogger (the former on the
nodes, the latter on a monitor machine) you can probably find out by
monitoring a mix of job and network traffic per node, especially if the
nodes are typically used for grid-like applications that don't generate
a lot of network traffic.  The easiest way to get an idea of what/who to
look for is to run "lsof -N" on the nodes to see what NSF based files
are open on the node.  Note that you'll likely need to do more --
monitor likely looking files directly for being modified in association
with active process and burst of network traffic -- to really run this
down.

    rgb

>
>
>
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-- 
Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at phy.duke.edu


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