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

Subject: Re: large arrays native element count wrong with Channel Access in EPICS 3.14.12
From: "Ernest L. Williams Jr." <ernesto@slac.stanford.edu>
To: Jeff Hill <johill@lanl.gov>
Cc: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 13 Jan 2011 10:34:45 -0800
Jeff Hill wrote:
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

Hi,
Where do we pick up the patch?
Looks like I can just grab the text directly from "https://bugs.launchpad.net/epics-base/+bug/701673";

Andrew do you intend to add the patch to *EPICS Base R3.14.12: Known Problems web page?*



Cheers,
Ernest

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 in EPICS 3.14.12 Andrew Johnson
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
RE: large arrays native element count wrong with Channel Access in EPICS 3.14.12 Jeff Hill

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