Experimental Physics and
Industrial Control System

Dehong,
I think this shows that the problem is not in channel access, but in the
database or lower.  You're not losing monitor callbacks, the record is
posting the same value twice, with the same time stamp.  You can get
another clue to what this means by looking at the record-support code,
and finding calls to recGblGetTimeStamp() and calls to db_post_events()
for the CTME field.

Hi Friends Kay, Mark and Mohan,

Thank you very much for the advices.

I just tried camonitor.  It is doing the same thing: throw away every the other
change, but callback two times for the other ones.  The printout is like:

fastTimeTest.CTME 2008-08-08 16:46:02.609123 6.88202e+06 fastTimeTest.CTME 2008-08-08 16:46:02.859123 7.38478e+06 fastTimeTest.CTME 2008-08-08 16:46:02.859123 7.38478e+06 fastTimeTest.CTME 2008-08-08 16:46:03.259123 8.01506e+06 fastTimeTest.CTME 2008-08-08 16:46:03.259123 8.01506e+06 fastTimeTest.CTME 2008-08-08 16:46:03.659123 137329 fastTimeTest.CTME 2008-08-08 16:46:03.659123 137329 fastTimeTest.CTME 2008-08-08 16:46:04.059123 817524 fastTimeTest.CTME 2008-08-08 16:46:04.059123 817524

Does the record update time stamps tell anything? Am I running too fast?

Thank you again.  Best regards,
Dehong

----- Original Message -----
From: Mohan Ramanathan <[email protected]>
Date: Friday, August 8, 2008 4:43 pm
Subject: RE: Loosing half the monitor callbacks
To: Dehong Zhang <[email protected]>, [email protected]

Hi
Try to set the TPRO field in the IOC to see that it is indeed processing every time

Mohan

----------------------------------------------------------------
Mohan Ramanathan  ([email protected])
Senior Beamline Engineer, Advanced Photon Source
Argonne National Laboratory, Argonne, IL 60439
(630)-252-3773/ (630)-822-5625(Cell)
----------------------------------------------------------------

[Message delivered by NotifyLink]

----------Original Message----------

From: Dehong Zhang <[email protected]>
Sent: Fri, August 08, 2008 4:30 PM
To: [email protected]
Subject: Loosing half the monitor callbacks

Hi,

I would like to monitor a PV at 5 Hz. Somehow I do get 5 callbacks every seconds
but only get the changes every the other time, like getting changes 1st, 3rd, 5th ...
two times, but never get changes 2nd, 4th, ...

Could you please enlighten me?

Thanks and best regards,
Dehong

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab.

Replies:

Re: Loosing half the monitor callbacks Dehong Zhang

Re: Loosing half the monitor callbacks Dehong Zhang

References:

RE: Loosing half the monitor callbacks Mohan Ramanathan

Re: RE: Loosing half the monitor callbacks Dehong Zhang

Navigate by Date:

Prev: Re: RE: Loosing half the monitor callbacks Dehong Zhang

Next: RE: RE: Loosing half the monitor callbacks Mark Rivers

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: RE: Loosing half the monitor callbacks Dehong Zhang

Next: Re: Loosing half the monitor callbacks Dehong Zhang

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