Experimental Physics and Industrial Control System

Paul is right. I think:
1. EPICS environment variables (if gov.aps.jca.jni.JNIContext.jca.use_env=true in System level JCALibrary.properties)

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Chu, Paul
Sent: Tuesday, October 23, 2012 2:01 PM
To: Mark Rivers; 'Matej Sekoranja'; [email protected]
Subject: RE: JCA problems and questions

When I first implemented this feature at SLAC, I believe JCA or CAJ took the following override order (higher number overrides lower ones, e.g. 2 overrides 1): 

1. EPICS environment variables 
2. System level JCALibrary.properties (in system JRE or JDK's lib folder)
3. User level JCALibrary.properties (e.g. in user's ~/.JCALibrary for Linux)
4. Command line -D option

Paul

> -----Original Message-----
> From: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Mark Rivers
> Sent: Tuesday, October 23, 2012 4:37 PM
> To: 'Matej Sekoranja'; [email protected]
> Subject: RE: JCA problems and questions
> 
> 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: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Matej Sekoranja
> Sent: Tuesday, October 23, 2012 3:33 PM
> To: [email protected]
> 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

References:

Re: JCA problems and questions Matej Sekoranja

RE: JCA problems and questions Mark Rivers

RE: JCA problems and questions Chu, Paul

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