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

Subject: RE: JCA problems and questions
From: Mark Rivers <rivers@cars.uchicago.edu>
To: "'Matej Sekoranja'" <matej.sekoranja@cosylab.com>, "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Tue, 23 Oct 2012 20:37:13 +0000
Hi Matej,

Thanks for the reply.

Lewis also pointed out the new feature of caj.use_env to have CAJ use the traditional EPICS environment variables.  I am now using that in the areaDetector ImageJ plugin.  However, I have a couple of questions:

- What is the order of obtaining values from a JCALibrary.properties file versus the EPICS environment variables?

- Is the new caj.use_env documented anywhere except the single line in the change notes?

Thanks,
Mark


From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Matej Sekoranja
Sent: Tuesday, October 23, 2012 3:33 PM
To: tech-talk@aps.anl.gov
Subject: Re: JCA problems and questions

Hi,

Rok Sabjan notified me about this thread. Thanks to Lewis for replies.

The old send buffer algorithm was to initialize the send buffer size to max_array_bytes and
automatically resize on demand (there is one send buffer per TCP connection). Not something
one would dare to use on a server, however very convenient on the client side.

However, if a client has a lot of connections there is a lot of memory required when max_array_bytes is large (e.g. 100 connection * 10MB = 1GB!).
Current algorithm starts with an initial size of 1k that can be automatically resized up to max_array_bytes.
This also mimics C++ CA algorithm (that has also evolved over the years).

Cheers,
Matej


Replies:
RE: JCA problems and questions Chu, Paul
References:
Re: JCA problems and questions Matej Sekoranja

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