EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  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  <20082009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Re: Fast Cross-IOC Loops?
From: Dirk Zimoch <[email protected]>
To: Ralph Lange <[email protected]>
Cc: EPICS Tech Talk <[email protected]>
Date: Wed, 12 Nov 2008 17:16:56 +0100
Hi Ralph

Answer one: Don't do that.

Answer two: We are working on a solution to use the data buffer of the timing system for real-time communication. We will need such a fast channel for our FEL. At the moment, the data flow is only one way. We hope that "upstream" communication will be possible soon (depending how busy Jukka is).

Dirk

Ralph Lange wrote:
Hello!

What would be the smartest way to implement fast cross-IOC loops that are high-priority?

Problem: The CA server tasks on the target IOC are low priority (for good reasons, I know!), so that - even with a fast synchronous device support -
any stupid slow-and-low record processing on that IOC will introduce delays, which leads to jitter or multiple CA updates before the target record gets processed.


Oh, yes: "fast" would be something below 200Hz.

Any hints welcome...
Ralph



-- Dr. Dirk Zimoch Paul Scherrer Institut, WBGB/006 5232 Villigen PSI, Switzerland Phone +41 56 310 5182

Replies:
Re: Fast Cross-IOC Loops? Jukka Pietarinen
References:
Fast Cross-IOC Loops? Ralph Lange

Navigate by Date:
Prev: Re: question about ca gateway Dirk Zimoch
Next: Re: Fast Cross-IOC Loops? Matthieu Bec
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: RE: Fast Cross-IOC Loops? Thompson, David H.
Next: Re: Fast Cross-IOC Loops? Jukka Pietarinen
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 02 Sep 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·