Experimental Physics and
Industrial Control System

Martin Konrad via Core-talk <[email protected]> · Wed, 08 Jan 2020 16:56:39 -0000

Public bug reported:

By default waveform records always post updates. The rationale behind
that is that the EPICS developers didn't want to keep another copy of
the array around for comparing (waveforms can be huge). However, in case
of the waveform record the IOC can also keep a 32-bit hash of the array
data around to determine if the data changed. This behaviour can be
controlled by the APST and MPST field. Let's add this feature to the
subArray record as well.

** Affects: epics-base
     Importance: Undecided
     Assignee: Martin Konrad (info-martin-konrad)
         Status: New

** Tags: codeathon

** Changed in: epics-base
     Assignee: (unassigned) => Martin Konrad (info-martin-konrad)

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https://bugs.launchpad.net/bugs/1858826

Title:
  subArray record: prevent posting unneeded updates on CA

Status in EPICS Base:
  New

Bug description:
  By default waveform records always post updates. The rationale behind
  that is that the EPICS developers didn't want to keep another copy of
  the array around for comparing (waveforms can be huge). However, in
  case of the waveform record the IOC can also keep a 32-bit hash of the
  array data around to determine if the data changed. This behaviour can
  be controlled by the APST and MPST field. Let's add this feature to
  the subArray record as well.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System