[PyQt] Performance deterioration when using integer spin boxes PS ...

[Preisig, Heinz A]

PS: playing more it is not only the spin box. Other actions taken on the 
interface slow it down too. Thus it is not a problem with the spin 
boxes, but must be more generic. Only noticed the problem there first.

On 09/22/2010 04:48 PM, Preisig, Heinz A wrote:
> 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
>>> _______________________________________________
>>> PyQt mailing listPyQt at riverbankcomputing.com
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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>
>
>
>
> _______________________________________________
> PyQt mailing list    PyQt at riverbankcomputing.com
> http://www.riverbankcomputing.com/mailman/listinfo/pyqt

-- 


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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