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

Subject: Re: Problem using large arrays with Channel Access in EPICS 3.14.12
From: Andrew Johnson <anj@aps.anl.gov>
To: tech-talk@aps.anl.gov
Date: Tue, 11 Jan 2011 15:43:22 -0600
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: Problem using large arrays with Channel Access in EPICS 3.14.12 Jeff Hill
RE: large arrays native element count wrong with Channel Access in EPICS 3.14.12 Jeff Hill
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

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