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<== Date ==> <== Thread ==>

Subject: EDM display update rate
From: jon@u.washington.edu
To: tech-talk@aps.anl.gov
Date: Fri, 23 Oct 2015 16:44:19 -0700 (PDT)

We notice that EDM updates the screen about twice per second.  For
example, using a text control to display a calc record whose VAL
increments 10 times a second shows the count incrementing by five
units every half-second.

It seems this rate was chosen deliberately. My colleague Stefani Banerian
found this message: http://www.aps.anl.gov/epics/tech-talk/2009/msg00415.php
which says "the intention was to check each display about twice per second".
She also found these lines in edmMain/main.cc:

 main.cc:1566:  stat = thread_create_handle( &delayH, NULL );
 main.cc:1775:      thread_delay( delayH, 0.5 );

We would like to increase the update rate to 5/sec or so.  Is any way
to achieve this without changing source code and rebuilding EDM?

(This is for simple displays with text controls showing only seven PVs,
where just one at a time is changing.  These would replace hard-wired
LED displays.)

Jon Jacky


Replies:
Re: EDM display update rate Sinclair, John William

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