Experimental Physics and
Industrial Control System

Ryan Slominski <[email protected]> · Mon, 08 Aug 2011 12:05:34 -0400

Hello,

 Could anyone provide a multi-threaded Channel Access Java (CAJ)

example? The closest thing I could find was the JCA tutorial

(http://www.aps.anl.gov/bcda/jca/jca/2.1.2/tutorial.html), but this is

single threaded, and JCA. I'm new to CAJ and EPICS.

I've created a web application that uses CAJ, but the performance is

lack-luster. I've identified the bottleneck as the destruction of the

context object, which oddly takes over a second (the initialization and

CA get is actually fast - just a few milliseconds). Each client web

request is serviced in its own thread and creates a new context and then

destroys the context within the request.

Some things I am considering to get around the high cost of destroying a

context is sharing a single context across all client requests (It

appears I'd have to serialize myself; won't scale), or creating a

context pool.

Thanks for your time,

Ryan Slominski
Thomas Jefferson National Accelerator Facility

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System