Experimental Physics and Industrial Control System
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John Sinclair wrote:
2) There is a more subtle ongoing problem that (as far as I know)
has only been reported here at Jefferson Lab. When an EDM session
has been left running for a long (variable) time, the widgets will
stop updating despite the fact that the PV values are still
changing. There is no visual clue that anything is wrong, unless you
can see the same PV's in a different app or a separate EDM session.
Usually everything will start updating again if you open or close a
display, or even expose a covered display. This issue only started
when we moved from HP-UX to RedHat Enterprise Linux. It has not yet
been resolved.
It would be interesting to know more about this. If you mouse over
a display element like a text control and do a control-middle-mouse
click you will get something like the following in the message window.
------------------------------------------------
Text Control (105,46): b:Vgc12-1Ig1:PressureR
Host: orib60.phy.ornl.gov:5064
Num times conected = 1
Num times disconected = 0
Num value changes = 1
Num references = 2
Time stamp = Wed Jan 21 17:11:00 2009
------------------------------------------------
It would be nice to know if the various pvs that were no longer updating
had any things in common like hostname, timestamp, or if any of the
numeric values looked fishy (negative values, etc.).
John Sinclair
We've been trying to find patterns in the occurrences, but so far
nothing has emerged. We cannot reliably reproduce the problem. I have
never had it happen on my own workstation no matter how long I keep EDM
running, and many operators never see it. Many user interactions (window
open or close, expose events, sometimes clicking control widgets) will
kick everything into working order again, so the data is sparse.
I do have reports that ctrl-middle clicking on "frozen" widgets multiple
times does show that CA updates are being received and timestamps are
increasing, but I have not been able to verify this myself. Based on
reports, there is no consistency in the server hostname of the frozen
widgets. They seem to freeze screen by screen, rather than ioc by ioc.
The values displayed in the widgets never look fishy, and ctrl-middle
click does not report the current value.
--Brian
--
Brian S. Bevins, PE
Computer Scientist / Mechanical Engineer
Thomas Jefferson National Accelerator Facility
"Nothing in all the world is more dangerous than
sincere ignorance and conscientious stupidity."
--Martin Luther King Jr.
- References:
- EDM freezes Szalata, Zenon M.
- Re: EDM freezes Brian Bevins
- Re: EDM freezes John Dobbins
- RE: EDM freezes Szalata, Zenon M.
- Re: EDM freezes John Sinclair
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ANJ, 31 Jan 2014 |
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