[PyQt] Performance deterioration when using integer spin boxes

[Preisig, Heinz A]

Certainly:

I am using a timer to generate time events. On each time event I am 
doing a computation, in this case a data acquisition (DA converter) and 
then a computation the result of which is sent to a DA converter. The 
interface has a couple of spin boxes and sliders and buttons to 
manipulate what is happening. In the application I am using now, I 
replaced the process interface, which actually goes and receives and 
sends data to a serial port, by a simple simulation, which essentially 
does nothing.

What I observe is that when the task executes nicely in the time grid (1 
s). Once I am changing things in a spin box, the task does not make it 
to catch the next time event and it keeps on slowing down the more I am 
manipulating. I presume there are lots of events being generated in the 
background or passed on to other levels.

I should mention that this is not the first application of this type. We 
wrote one last year and it worked just fine. We used it extensively at 
the time on very slow machines. The one I am working on now is a much 
faster machine and it runs the newer version of python and pyqt. On the 
slow one it gets bugged down tremendously.

Not sure what the problem is....

Heinz

On 09/22/2010 04:04 PM, Hans-Peter Jansen wrote:
> On Wednesday 22 September 2010, 15:45:15 Preisig, Heinz A wrote:
>    
>> I observed that when using integer spin boxes in a timed loop the
>> performance drops significantly after changing a value.
>>      
> Heinz, could you elaborate on "using integer spin boxes in a timed loop" a
> bit, please? I don't grasp the concept of it ATM.
>
> Pete
>
>    
>> After dxchanging
>> them by double spin boxes no deterioration was observed.
>>
>> Heinz Preisig
>> _______________________________________________
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>>      
>
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-- 


Heinz A Preisig
Professor of Process Systems Engineering 	Private:
Øvre Bakklandet 62 B, 7013 Trondheim, Norway
Department of Chemical Engineering
Norwegian University of Science and Technology
N -- 7491 Trondheim, Norway 	Tel direct: +47 735 92807
Tel mob: +47 9754 1334
e-mail: Heinz.Preisig at chemeng.ntnu.no <mailto:Heinz.Preisig at chemeng.ntnu.no>
web: www.chemeng.ntnu.no\~preisig <http://www.chemeng.ntnu.no/%7Epreisig>


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