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

Subject: RE: large arrays native element count wrong with Channel Access in EPICS 3.14.12
From: "Jeff Hill" <johill@lanl.gov>
To: <tech-talk@aps.anl.gov>
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        johill@lanl.gov
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:johill@lanl.gov]
> Sent: Wednesday, January 12, 2011 9:27 AM
> To: 'tech-talk@aps.anl.gov'
> 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        johill@lanl.gov
> 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: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-
> > bounces@aps.anl.gov] On Behalf Of Andrew Johnson
> > Sent: Tuesday, January 11, 2011 2:43 PM
> > To: tech-talk@aps.anl.gov
> > 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

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