Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  <20102011  2012  2013  2014  2015  2016  2017  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  <20102011  2012  2013  2014  2015  2016  2017 
<== Date ==> <== Thread ==>

Subject: RE: PV's element count differs though CA gateway
From: "Jeff Hill" <johill@lanl.gov>
To: "'Carl Schumann'" <schumann@fnal.gov>, <tech-talk@aps.anl.gov>, "'Dehong Zhang'" <dhzhang@fnal.gov>
Cc: "'Salah J Chaurize'" <chaurize@fnal.gov>, "'Denise S. Finstrom'" <dfinstrom@fnal.gov>
Date: Fri, 21 May 2010 14:29:59 -0600
Hi Carl,

I suspect that the gateway has been attached to that PV for a long time, and
that it learned a maximum element count when it initially connected which is
no longer accurate. Rebooting the IOC or restarting the gateway, whichever
is easiest, might help. Also, note that services (a waveform record in an
IOC in this case presumably) generally report a maximum element count when
the client connects, but can choose to return a lesser current amount of
elements later as appropriate. 

PS: I am out the door on the way to Oxford for the codeathon Saturday
afternoon, and since the rules here say that I can't take my smart card out
of country then I will not have email access for some weeks after that, but
perhaps I will see you at the EPICS meeting.

Jeff
______________________________________________________
Jeffrey O. Hill           Email        johill@lanl.gov
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

Message content: TSPA


> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-
> bounces@aps.anl.gov] On Behalf Of Carl Schumann
> Sent: Friday, May 21, 2010 1:15 PM
> To: tech-talk@aps.anl.gov; Dehong Zhang
> Cc: Salah J Chaurize; Denise S. Finstrom
> Subject: PV's element count differs though CA gateway
> 
> Tech-talk, Dehong Zhang,
> 
> We have a client application which attempts to access a PV's elements 0
> to 999 .   This application is run on two sets of machines.   One set
> must go through an EPICS gateway to access the PV.  The other set does
> not do so.    The application does not run properly when going through
> the gateway because of an out-of-bounds error at element 940.   It is
> able to access elements all they way up to 999 without issue when there
> is no gateway involved.
> 
> We were able to track this issue down to a difference in the element
> count reported by the originating IOC vs. the gateway using cainfo.
> For the gateway case cainfo reports element count 940, but for the
> non-gateway case cainfo reports 1000.    Using EPICS_CA_ADDR_LIST we
> were able to reproduce both element counts on a single machine depending
> on whether the gateway or the originating IOC responded.   The result is
> attached.
> 
> Me and my co-workers find this result unexpected and are not sure how to
> fix it.   Any help would be appreciated please.  Thanks for your time.
> 
> Sincerely,
> Carl Schumann
> 
> P.S.: for my co-worker Dehong owner of the hins_ws.py:
> The client is hins_ws.py.   The PV is PD_LEBT:Inst:WS1.RST1.   It is the
> out-of-bound error that prevents the Save Result button from generating
> a file.   Do have any insight about what might be going on here?  Thanks.




Replies:
Re: RE: PV's element count differs though CA gateway Carl Schumann
References:
PV's element count differs though CA gateway Carl Schumann

Navigate by Date:
Prev: PV's element count differs though CA gateway Carl Schumann
Next: fsmRecord preview Davidsaver, Michael
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  <20102011  2012  2013  2014  2015  2016  2017 
Navigate by Thread:
Prev: PV's element count differs though CA gateway Carl Schumann
Next: Re: RE: PV's element count differs though CA gateway Carl Schumann
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  <20102011  2012  2013  2014  2015  2016  2017 
ANJ, 02 Sep 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·