Experimental Physics and Industrial Control System
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On 18.03.2014 17:26, Brian Bevins wrote:
Using client-set priorities occurred to me, but then it seems I would
need to write my own client to monitor and display the slow (or fast)
records. Standard clients are all pretty much going to use a default
priority in ca_create_channel(). If there is an existing general
purpose client that allows setting the priorities, I'd love to hear
about it. I'm currently using R3.14.12.3 on RTEMS, and I don't yet
know if that supports client-set priority. If it does, then writing a
little display program might work.
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.
If I were to switch to rt linux and make use of mcoreutils, it sounds
like I would essentially run two virtual iocs on the same machine, one
at a higher priority. Is that right?
No.
MCoreUtils uses a hook into the EPICS thread creation mechanism. You
specify rules that - by regex-matching on the thread name - directly
manipulate priority, scheduling policy, and CPU affinity whenever the
IOC starts a thread.
Cheers,
~Ralph
- Replies:
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ANJ, 17 Dec 2015 |
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