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@xxxxxxxxx > 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@xxxxxxxxxxxxxx> wrote: > > > > > > From: redhat-list-bounces@xxxxxxxxxx [redhat-list-bounces@xxxxxxxxxx] > > on behalf of Yixin Luo [luoyixin@xxxxxxxxx] > > > 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 > > > > > > > > -- > > redhat-list mailing list > > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > > https://www.redhat.com/mailman/listinfo/redhat-list > > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
