EPICS Home EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

Format page
for printing


Search Tech-talk
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  <2022>  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  <2022>  2023  2024 
<== Date ==> <== Thread ==>
Subject: Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating
From: Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Date: Mon, 26 Sep 2022 18:52:59 +0200
On Mon, 26 Sept 2022 at 18:17, Mark Rivers <rivers at cars.uchicago.edu> wrote:

 

Ø  For rarely-moving things, it just blows up the file with redundant identical samples.

 

That is not my interpretation of what Kay said:

Ø  Instead, it would for example scan once every 5 minutes, and then write whatever the most recently received sample was .. if it changed.

 

That means it should not fill up the file, because it does not write anything if it has not changed.


Ok.
And since changed means either a new timestamp or a new value, setting ADEL=-1 would fill up the file even for a non-changing PV, with the SCAN/MONITOR setting only affecting the rate of filling it up.

I will understand it eventually. I'm confident.

Thanks!
~Ralph

References:
Re: How to archive PVs regularly even if they are not updating Shankar, Murali via Tech-talk
Re: How to archive PVs regularly even if they are not updating Ralph Lange via Tech-talk
Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Kasemir, Kay via Tech-talk
Re: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Ralph Lange via Tech-talk
RE: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Mark Rivers via Tech-talk
Navigate by Date:
Prev: RE: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Mark Rivers via Tech-talk
Next: error during building synapps module Siddharth Vardhan Pratihast via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  <2022>  2023  2024 
Navigate by Thread:
Prev: RE: [EXTERNAL] Re: How to archive PVs regularly even if they are not updating Mark Rivers via Tech-talk
Next: 1D Histogram in Phoebus Florian Feldbauer via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  <2022>  2023  2024 
ANJ, 27 Sep 2022 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·