Re: Camonitor with client dictated update rate

[William Layne via Tech-talk <tech-talk@aps.anl.gov>]

Oops forgot to CC tech-talk

--------- Forwarded message ---------

From: William Layne <william.casey.layne@gmail.com>
Date: Wed, May 29, 2019, 5:08 PM
Subject: Re: Camonitor with client dictated update rate
To: Hinko Kocevar <Hinko.Kocevar@esss.se>

You could create a record, with a 1hz scan rate, that has the input field linked to the desired PV. Then have your user monitor the subsampled PV.

On Wed, May 29, 2019, 1:21 PM Hinko Kocevar via Tech-talk <tech-talk@aps.anl.gov> wrote:

This might sound like a silly motion, but you are probably used to those from me by now. 

A non-EPICS person at my facility wonders if EPICS could support camonitor like PV monitoring, but with CA client dictating the rate of value updates. Imagine 1s update rate, that certain slow client would use, while the PV would update much faster, and the rest of existing CA clients just use regular camonitor’ing. 

I can see answers like, just use caget like approach and poll or define a new (set) of PVs for that slow rate, but that is IOC material. My use case revolves around very, very busy IOC devs that have no time to support crazy ideas of individuals who want slow updates. 

Any insights appreciated!

Thanks (and have a nice weekend to those living in Sweden),
Hinko

On Wed, May 29, 2019, 1:21 PM Hinko Kocevar via Tech-talk <tech-talk@aps.anl.gov> wrote:

This might sound like a silly motion, but you are probably used to those from me by now.

A non-EPICS person at my facility wonders if EPICS could support camonitor like PV monitoring, but with CA client dictating the rate of value updates. Imagine 1s update rate, that certain slow client would use, while the PV would update much faster, and the rest of existing CA clients just use regular camonitor’ing.

I can see answers like, just use caget like approach and poll or define a new (set) of PVs for that slow rate, but that is IOC material. My use case revolves around very, very busy IOC devs that have no time to support crazy ideas of individuals who want slow updates.

Any insights appreciated!

Thanks (and have a nice weekend to those living in Sweden),
Hinko