Experimental Physics and
Industrial Control System

Matej Sekoranja <[email protected]> · Wed, 5 Aug 2009 14:11:58 +0200

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