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Subject: [Bug 1861612] Re: callbackRequestDelay not waiting for 1/60 sec on vxWorks
From: mdavidsaver via Core-talk <core-talk at aps.anl.gov>
To: core-talk at aps.anl.gov
Date: Mon, 03 Feb 2020 19:01:47 -0000
Can you test with a second RATE (say 30Hz) to see how this error in
delay scales?  This may give a hint as to where to focus (looking for
more quantum games, or ticksPerSec).

Also, what do epicsThreadSleepQuantum() and epicsMonotonicResolution()
return?

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https://bugs.launchpad.net/bugs/1861612

Title:
  callbackRequestDelay not waiting for 1/60 sec on vxWorks

Status in EPICS Base:
  New

Bug description:
  The problem is documented in this tech-talk thread:
  https://epics.anl.gov/tech-talk/2020/msg00308.php

  In 7.0.3.1, but not in 7.0.3, callbackRequestDelay(1/60) results in
  100% CPU time, most of the time in cbHigh.

  This happens on vxWorks 6.9.4.1 and was first seen with the scaler
  record with multiple types of scaler hardware and device support.

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References:
[Bug 1861612] [NEW] callbackRequestDelay not waiting for 1/60 sec on vxWorks rivers via Core-talk

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