EPICS Home

Experimental Physics and Industrial Control System


 
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  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  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: RE: large arrays native element count wrong with Channel Access in EPICS 3.14.12
From: "Jeff Hill" <[email protected]>
To: <[email protected]>
Date: Wed, 12 Jan 2011 16:21:38 -0700
I committed a fix to the R3.14 branch. An overzealous optimization was
installed. See bug 701673 at launchpad for the details.

https://bugs.launchpad.net/epics-base/+bug/701673

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

Message content: TSPA

With sufficient thrust, pigs fly just fine. However, this is
not necessarily a good idea. It is hard to be sure where they
are going to land, and it could be dangerous sitting under them
as they fly overhead. -- RFC 1925


> -----Original Message-----
> From: Jeff Hill [mailto:[email protected]]
> Sent: Wednesday, January 12, 2011 9:27 AM
> To: '[email protected]'
> Subject: RE: Problem using large arrays with Channel Access in EPICS
> 3.14.12
> 
> Yes, there were two new features merged into CA for the R3.14.12 patch
> release. I will have a look.
> 
> PS: IMHO, we can consider that risk is reduced if only patches are merged
> into patch releases. Perhaps new features are best placed in point
> releases.
> 
> Jeff
> ______________________________________________________
> Jeffrey O. Hill           Email        [email protected]
> LANL MS H820              Voice        505 665 1831
> Los Alamos NM 87545 USA   FAX          505 665 5107
> 
> Message content: TSPA
> 
> With sufficient thrust, pigs fly just fine. However, this is
> not necessarily a good idea. It is hard to be sure where they
> are going to land, and it could be dangerous sitting under them
> as they fly overhead. -- RFC 1925
> 
> 
> > -----Original Message-----
> > From: [email protected] [mailto:tech-talk-
> > [email protected]] On Behalf Of Andrew Johnson
> > Sent: Tuesday, January 11, 2011 2:43 PM
> > To: [email protected]
> > Subject: Re: Problem using large arrays with Channel Access in EPICS
> > 3.14.12
> >
> > On Tuesday 11 January 2011 15:21:32 Till Straumann wrote:
> > > Could be a limitation of the CA protocol
> >
> > No, this is as a result of changes in src/rsrv between 3.14.11 and
> > 3.14.12
> > because large arrays work fine in 3.14.11.
> >
> > We introduced two major new features in the latest release, CA over TCP
> > and
> > dynamic array sizing, and one of them (most probably the latter) has
> > broken
> > the correct reporting of the element count.  The CA protocol solved the
> > problem of only a having a 16 bit m_count field a long time ago, but it
> > looks
> > like that hack^H^H^H^Hsolution didn't get propagated into the latest
> > code.
> >
> > - Andrew
> > --
> > If a man is offered a fact which goes against his instincts, he will
> > scrutinize it closely, and unless the evidence is overwhelming, he will
> > refuse to believe it.  If, on the other hand, he is offered something
> > which affords a reason for acting in accordance to his instincts, he
> > will accept it even on the slightest evidence.  -- Bertrand Russell



Replies:
RE: large arrays native element count wrong with Channel Access inEPICS 3.14.12 Mark Rivers
Re: large arrays native element count wrong with Channel Access in EPICS 3.14.12 Ernest L. Williams Jr.
References:
Problem using large arrays with Channel Access in EPICS 3.14.12 Mark Rivers
Re: Problem using large arrays with Channel Access in EPICS 3.14.12 Till Straumann
Re: Problem using large arrays with Channel Access in EPICS 3.14.12 Andrew Johnson

Navigate by Date:
Prev: Re: gateway question Ralph Lange
Next: Re: Building seq-2.0.11 with base-3.14.12 jun-ichi.odagiri
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: RE: Problem using large arrays with Channel Access in EPICS 3.14.12 Jeff Hill
Next: RE: large arrays native element count wrong with Channel Access inEPICS 3.14.12 Mark Rivers
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024