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

Subject: RE: Problem using large arrays 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 09:27:26 -0700
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
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Message content: TSPA

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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



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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