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Subject: Re: No monitor refresh [SOLVED]
From: Hinko Kocevar <hinko.kocevar@i-tech.si>
To: tech-talk@aps.anl.gov
Date: Wed, 23 Jun 2010 10:36:44 +0200
Hi all,

I want to mark this question as resolved.

There were at least two problems:
 - high CPU load,
 - improper I/O handling,

EPICS driver code was updated to run some ports in a separate thread and
that resulted in prompt response on monitors.

Thank you all for the help!

Best regards,
Hinko

On 05/11/10 12:26, Hinko Kocevar wrote:
> Hi all,
> 
> I'm experiencing some strange behavior when using camonitor against an
> EPICS IOC.
> 
> For some reason a CA_PROTO_EVENT_ADD response from IOC to CA client does
> not arrive, or arrives several minutes later after the PV value has
> changed. Note that first CA_PROTO_EVENT_ADD response is seen always,
> only latter CA_PROTO_EVENT_ADD responses do not arrive (or arrive late)?!
> This behavior is not seen always - sometimes the IOC would promptly
> respond with CA_PROTO_EVENT_ADD response when needed.
> 
> I can see the CA_PROTO_ECHO requests/responses fine on the same
> camonitor channel link, only CA_PROTO_EVENT_ADD response is not seen.
> 
> Inspecting the IOC I can see that the value did change (on lower levels)
> and caput response is also valid - updated with new value.
> 
> I've ruled out the network problems, since the issue is raised even when
> using cross-over cable to communicate with the IOC. Actually even I
> update the value in the IOC shell, the camonitor is not refreshed!!
> 
> 
> 
> Has someone experienced something similar?
> Are there some conditions that need to fulfilled in order for IOC to
> send a subsequent CA_PROTO_EVENT_ADD response(s)?
> 
> 
> 
> TIA & HAND,
> Hinko
> 


-- 
Hinko Kocevar
Technical support software engineer
Instrumentation Technologies d.d.
Velika pot 22, SI-5250 Solkan - Slovenia
T:+386 5 3352600, F:+386 5 3352601
mailto: hinko.kocevar@i-tech.si

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References:
No monitor refresh Hinko Kocevar

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