OK, problem has been removed, though I do not know what the problem was.
The issue was that MatPlotLib did not go together with the rest and
simply got the whole program to a stand-still. I have not had the time
to check what really was the problem, but it seemed obvious that a long
queue of events is somewhere in the background generated.
Exchanging the plotting with a PyQwt implementation that is a little
less luxurious, the problem disappeared. Performance was actually
significantly improved also when not using any other event-driven parts
of the interface. Thus looks like PyQwt is recommendable.
Heinz Preisig
On 09/22/2010 05:06 PM, Preisig, Heinz A wrote:
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
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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.prei...@chemeng.ntnu.no
<mailto:heinz.prei...@chemeng.ntnu.no>
web: www.chemeng.ntnu.no\~preisig
<http://www.chemeng.ntnu.no/%7Epreisig>
_______________________________________________
PyQt mailing listp...@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.prei...@chemeng.ntnu.no
<mailto:heinz.prei...@chemeng.ntnu.no>
web: www.chemeng.ntnu.no\~preisig <http://www.chemeng.ntnu.no/%7Epreisig>
_______________________________________________
PyQt mailing list PyQt@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.prei...@chemeng.ntnu.no <mailto:heinz.prei...@chemeng.ntnu.no>
web: www.chemeng.ntnu.no\~preisig <http://www.chemeng.ntnu.no/%7Epreisig>
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