Experimental Physics and
Industrial Control System

Brian Bevins <[email protected]> · Tue, 18 Mar 2014 15:57:24 -0400

On 03/18/14 12:38, Ralph Lange wrote:

RTEMS uses real-time priorities, so the CA priority will have effect.

IOC-to-IOC connections have a higher CA priority by default (80),

which might give you a somewhat indirect influence. (A soft IOC

connecting to the "fast" channels will get them with higher CA

priority than regular GUI clients or Gateways.)

The 'casr' command on the IOC will list the priorities of all current

CA connections.

Hmm. When I run casr on my ioc, I get back one priority value per

client, not one per channel. And all of the priorities are currently

zero. Should this output look different if I were setting priority on a

per channel basis from the client?

I'm inclined to try the soft ioc test for the fast records, or maybe

write a client to test priorities. That would get messy in practice, but

should prove the principle. I was really hoping there was a way to do

this from the server end.

Unfortunately since all the EDM client priorities default to zero, if I

want to make this work with a custom client, it has to be for the (large

number of) fast records since I can't make the priority of the (small

number of) slow ones lower than zero.

--
Brian S. Bevins, PE
Computer Scientist / Mechanical Engineer
Thomas Jefferson National Accelerator Facility

     "The urge to save humanity is almost always only a false-face
      for the urge to rule it."
                                     -- H. L. Mencken

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System