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: Callback queue overflow
From: Eric Norum <[email protected]>
To: Andrew Johnson <[email protected]>, EPICS mailing list <[email protected]>
Date: Tue, 16 May 2017 10:15:14 -0700
I have an EPICS R3.14.12 Linux IOC with about 24000 records, many of which are SCAN=“I/O Intr”.   I see occasional messages indicating callback request queue overflow:
-- 0:st.screen -- time-stamp -- May/16/17  1:29:02 --
callbackRequest: cbLow ring buffer full
-- 0:st.screen -- time-stamp -- May/16/17  1:29:59 --
-- 0:st.screen -- time-stamp -- May/16/17  2:59:02 --
callbackRequest: cbLow ring buffer full
-- 0:st.screen -- time-stamp -- May/16/17  2:59:54 --
-- 0:st.screen -- time-stamp -- May/16/17  7:59:02 --
callbackRequest: cbLow ring buffer full
callbackRequest: cbLow ring buffer full
-- 0:st.screen -- time-stamp -- May/16/17  8:00:02 --


I’ve attempted to increase the queue size, but maybe not enough:
###############################################################################
# Override some sizes -- this IOC has *lots* of records
callbackSetQueueSize(10000)
dbPvdTableSize(8192)


Is there any downside to setting the callback queue size to something really large, says 50000 or more?  Is there something else I should try?

Thanks
-- 
Eric Norum
[email protected]

Replies:
Re: Callback queue overflow Andrew Johnson
Navigate by Date:
Prev: Re: sending pickled python objects of epics channel access Wang Xiaoqiang
Next: Re: Callback queue overflow Andrew Johnson
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: sending pickled python objects of epics channel access Hartman, Steven M.
Next: Re: Callback queue overflow Andrew Johnson
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, 21 Dec 2017 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·