Re: [tauruslib-devel] Tango server and Taurus client interaction problem.

[Zbigniew R. <zre...@ce...>]

Dear Alexander,

To be honest I've not experienced this problem before. But I will try to 
help you with what I know.
The warning message comes from the push_event method of the 
TangoConfiguration class.
This method is passed as a callback when subscribing to the attribute's 
configuration event.
In the code it has an interesting comment:

#===================================================================
# This is a safety net to catch "zombie" TangoConfiguration objects
# when they get called.
# If you get here, there is some bug elsewhere which should be
# investigated.
# Without this safety net, you would get exceptions.
# We assume that a TangoConfiguration object which has no listeners
# and which is not associated to a TangoAttribute, is a "zombie".

 From the taurus script which you attached in the Tango forum entry, the 
code responsible for subscribing to this event is: signal.name.
The attribute name is obtained from the Tango configuration object and 
Taurus subscribes to configuration events the first time one tries to 
obtain some value from it like label, units, name, etc..

In order to debug the problem could you please:

1) Try to do not use the signal.name in your code and substitite if by 
signal.getSimpleName() and check if the memory also grows?

2) Try to execute the following code and see if the memory also grows:

import time
import PyTango

period = YOUR_POLLING_PERIOD
d = PyTango.DeviceProxy(YOUR_DEVICE_NAME)

while True:
     print d.read_attribute('signal').value[0:5]
     time.sleep(period)

Please let us know about results of your tests.

Cheers,
Zibi


On 08/03/2015 09:05 AM, Александр Сенченко wrote:
> Hello.
>
> I have been faced with a problem.
> When i connect to tango server from taurus client, server memory usage 
> grows.
> When i use C++ client or jive, it doesn't.
>
> When server increases memory consumption, taurus client issues a warning:
> Dummy-2 WARNING 2015-07-30 18:24:55,560 
> devhost:10000.simple2/gen/dev1.signal.configuration:
> "Zombie" object 
> (TangoConfiguration(devhost:10000/simple2/gen/dev1/signal?configuration)) 
> received an event. Unsubscribing it.
>
> Tango Server system:
> CPU powerpc
> OS debian lenny
> gcc 4.3.2
> Tango 8.1.2c
> zeromq 4.1.2
> omniorb 4.1.6
>
> Taurus Clietns system:
> CPU intel I7
> OS debian 8 jessie amd 64
> gcc 4.9
> omniorb 4.1.6
> zeromq 4.0.5
> tango 8.1.2c
> taurus 3.3.1
>
>
> I also started discussion in Tango forum:
> http://www.tango-controls.org/community/forums/topic/99/
>
>
> ------------------------------------------------------------------------------
>
>
> _______________________________________________
> Tauruslib-devel mailing list
> Tau...@li...
> https://lists.sourceforge.net/lists/listinfo/tauruslib-devel

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