Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Wed, 5 Aug 2009 08:23:03 -0500

Hi Matej,

> (This is not optimal regarding resource allocation, but it's very  
> convenient on client side. I can put a "hard" limit there, if you  
> wish...)

I agree that it is very convenient for clients, and I am happy to keep
the current behavior.  I just wanted to make sure that I understood how
it works.

Thanks,
Mark

-----Original Message-----
From: Matej Sekoranja [mailto:[email protected]] 
Sent: Wednesday, August 05, 2009 7:12 AM
To: Mark Rivers
Cc: [email protected]
Subject: Re: CAJ questions

HI,

> I have another question about CAJ, relating to the property
> "max_array_bytes".
>
> I am not setting the "max_array_bytes" property in a properties file  
> or
> in my application.  When I call context.printInfo in my running
> application I get the following:
>
> context.printfInfo  ****************************
>
> CLASS : com.cosylab.epics.caj.CAJContext
> ADDR_LIST : localhost 164.54.160.255
> AUTO_ADDR_LIST : false
> CONNECTION_TIMEOUT : 30.0
> BEACON_PERIOD : 15.0
> REPEATER_PORT : 5065
> SERVER_PORT : 5064
> MAX_ARRAY_BYTES : 16384
>
> The value of MAX_ARRAY_BYTES is 16384, the default, as I expect.
>
> However, my application is using CAJ to read arrays that are over  
> 1.2MB
> with no errors!  Is the max_array_bytes property actually not used in
> CAJ?  It looks like it must be being ignored?

Well, CAJ does not ignore this property. It preallocates its buffers  
using MAX_ARRAY_BYTES value.
However, if server sends a bigger array it replaces buffer with newly  
allocated (bigger one).

(This is not optimal regarding resource allocation, but it's very  
convenient on client side. I can put a "hard" limit there, if you  
wish...)

Matej

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System