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<== Date ==> <== Thread ==>

Subject: Callback queue overflow
From: Eric Norum <wenorum@lbl.gov>
To: Andrew Johnson <anj@aps.anl.gov>, EPICS mailing list <tech-talk@aps.anl.gov>
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
wenorum@lbl.gov


Replies:
Re: Callback queue overflow Andrew Johnson

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