head node has an extremely high load average.

[Yixin Luo]

It is true - %wa is too high if non-parallel job run. Ann, what is the new
top after reboot?

Yixin


On Thu, Jun 27, 2013 at 7:31 AM, Doll, Margaret Ann <margaret_doll at brown.edu
> wrote:

> 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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