Experimental Physics and
Industrial Control System

"Christopher J. Pendleton" <[email protected]> · Fri, 9 May 2014 12:10:54 -0400

Hello! I am using the portable channel access server API to provide EPICS
access to our devices. Some of our devices perform data acquisition at high
rates and send a buffer up to the server, which then calls the casPV class
method postEvent() repeatedly at a very high rate. When I run a client that
monitors this PV, I often see that some of the data samples are missing. I
suspect that this is a function of the queue size that postEvent()
populates, the rate at which it is populated, and the rate at which it is
offloaded by the client(s). Could someone please help me understand why the
client(s) would not receive the full set of data samples posted to the event
queue?

Regards,
Chris

Christopher J. Pendleton
Director, Software Development
Pyramid Technical Consultants, Inc.
http://ptcusa.com/

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System