head node has an extremely high load average.

[Doll, Margaret Ann]

I installed the iozone program and ran ./iozone -a.
How does this information help me find the offending program?

Sorry for my ignorance.

I do have 10 nfsd programs running.   I only have four jobs on the queues
none of which are running parallel code.


On Thu, Jun 27, 2013 at 7:42 AM, Miner, Jonathan W (US SSA) <
jonathan.w.miner at baesystems.com> wrote:

>
> > From: redhat-list-bounces at redhat.com [redhat-list-bounces at redhat.com]
> on behalf of Yixin Luo [luoyixin at gmail.com]
> > Sent: Wednesday, June 26, 2013 17:56
> > To: General Red Hat Linux discussion list
> > Subject: Re: head node has an extremely high load average.
> >
> > NFS may hang up. Have you tried running autofs?
>
> Can you explain why "autofs" would be better than NFS?   I have not
> managed any NFS-based systems for nearly a decade, but from what I
> remember, autofs simplifies the management aspect of network filesystems;
> but NFS is still the underlaying protocol.  Without autofs, things were
> mounted all the time, and you'd have to push changes out to all the
> clients' /etc/fstab files.
>
> As for Margaret's original problem, her system looks very I/O bound.  Like
> someone else suggested, I'd start looking at the local disk performance and
> see if one disk, or one bus was in contention for most of the traffic.
>  Then look at the number of nfsd processes and make sure they're
> appropriate for the expected load. The iozone program should help you with
> this task.
>
> http://www.thegeekstuff.com/2011/05/iozone-examples/
>
> - Jon
>
>
>
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