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<== Date ==> <== Thread ==>

Subject: RE: EPICS / file load interaction problem
From: "Jeff Hill" <johill@lanl.gov>
To: "'Erik Johansson'" <erikj@keck.hawaii.edu>, "'tech-talk \(E-mail\)'" <tech-talk@aps.anl.gov>
Date: Thu, 10 Apr 2003 13:49:27 -0600
Did you try increasing the number of mbufs for your vxWorks
systems IP kernel?

Jeff

> -----Original Message-----
> From: Erik Johansson [mailto:erikj@keck.hawaii.edu]
> Sent: Thursday, April 10, 2003 1:43 PM
> To: tech-talk (E-mail)
> Subject: EPICS / file load interaction problem
> 
> Hello again -
> 
>  A follow-up on my previous posting regarding the problem of
> reading
> NFS-mounted files on an IOC while EPICS is running:
> 
> I thoroughly investigated our network to make sure that there
> were no
> network problems causing the poor file-load performance. I also
> tried
> running my file-load code snippet on other IOCs in our system,
> with no
> change in behavior. Finally, and most interesting, I set up a
> bare-bones IOC
> in our electronics lab and was able to reproduce the problem.
> There are 4
> linked soft records, one of which is scanned at 0.5 seconds.
> After IOC init,
> my file read routine works just fine until I run camonitor on
> one of the
> channels. As soon as camonitor begins, the file load problems
> occur. I don't
> understand the underlying mechanism of monitors, but I am
> hoping that this
> is the key to the file load problems.
> 
> Does anyone understand monitors enough to explain why they
> would interfere
> with the reading of an NFS-mounted file? And, more importantly,
> is there
> anything I can do to fix the problem?
> 
> Any help you can give me is greatly appreciated.
> 
> Erik
> 
> ****************************************
> Erik M. Johansson
> Adaptive Optics Software Engineer
> W. M. Keck Observatory
> 65-1120 Mamalahoa Hwy
> Kamuela, HI 96743
> Tel: 808-885-7887
> Fax: 808-885-4464



References:
EPICS / file load interaction problem Erik Johansson

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