Experimental Physics and
Industrial Control System

Hi Ed,

 

I have not heard about a similar problem before.

 

Have you tried a more recent version of base, which would be a later version of pvAccess?  Are the other IOC that work OK using the same version of base and ADCore?

 

Mark

 

 

 

Hi,

 

I’m trying to use the NDPluginPva plugin from ADCore to support a live viewer application for one of our beamline detectors. On one of my detectors, I seem to see the EPICS v4 PV consistently fail to appear on the network.

 

Using ADCore 3-8, PVAccess 7-0-0, on RHEL7.9

 

Relevant parts of my ioc startup script:

 

# NDPvaConfigure(portName, queueSize, blockingCallbacks, NDArrayPort, NDArrayAddr, pvName, maxBuffers, maxMemory, priority, stackSize)

NDPvaConfigure("EXCBR.pva", 16, 0, "EXCBR.CAM", 0, BL14I-EA-EXCBR-02:PVA:ARRAY, 0, 0, 0, 0)

startPVAServer

 

No error messages produced, and no alarm state shown by any of the v3 PVs in the plugin – but a pvget to the PV returned by PvName_RBV consistently times out. pvlist shows the detector server as hosting a pvaserver instance, but pvlist <host ip>:<port> to list the hosted PVs also times out.

 

I suspect some sort of race condition – by stripping back the IOC, removing everything but the PVA plugin and a simdetector instance, I can get it to successfully start serving the PV on startup some of the time, although sometimes it still fails to appear. When using the full detector driver IOC, it always fails.

 

Other ADCore IOCs on the same network using NDPluginPva respond to pvget requests as expected, and running up one of these IOCs temporarily on the same detector server also results in its PVA PV appearing.

 

I’d appreciate any assistance you can suggest with debugging this. I’m happy to provide any further diagnostic information that may help.

 

Thanks,

 

Ed Warrick

Senior Software Systems Engineer

Diamond Light Source

 

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