Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Tue, 11 May 2010 08:45:32 -0600

Hello Hinko,

You mention that a caput updates the value in the IOC but the subscription update does not arrive or is late arriving. That might happen if 100% of the IOC's CPU is being consumed by threads running at higher priorities than the CA server. What type of record and field is the camonitor attached to?

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

Message content: TSPA

> -----Original Message-----
> From: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Hinko Kocevar
> Sent: Tuesday, May 11, 2010 4:27 AM
> To: EPICS Tech-Talk
> Subject: No monitor refresh
> 
> 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
> Velika pot 22, SI-5250 Solkan - Slovenia
> T:+386 5 3352600, F:+386 5 3352601
> mailto: [email protected]
> 
> http://www.i-tech.si - When your users demand stability
> 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System