To anyone who read this post, thanks for having a look. I found the
problem. It turned out the real bottleneck was the event handler
self.on_combo_column_changed; I fixed it by not connecting that event
handler to the signal until after the combo column is first set.
John
On 12/18/2010 09:32 AM, John Haiducek wrote:
> I have a function that draws a bunch of widgets and takes longer than
> expected to run; when I profile it I find the bottleneck is in
> gtk.ComboBox.set_active(). The set_active() method takes 0.364 seconds
> to run, while the rest of the function takes 0.012 seconds. I don't
> see why set_active should take so long; it doesn't take that long to
> pick an item from the list in the GUI. Incidentally, there are 28
> items in the ComboBox's model. Is there something I can do to make the
> set_active() call go faster?
>
> Here's my cProfile output:
>
> 191413 function calls (188937 primitive calls) in 0.769 CPU
> seconds
>
> Ordered by: cumulative time
> List reduced from 622 to 10 due to restriction <10>
>
> ncalls tottime percall cumtime percall filename:lineno(function)
> 1 0.000 0.000 0.769 0.769 <string>:1(<module>)
> 1 0.000 0.000 0.769 0.769 sqlvis.py:316(switch_figure)
> 1 0.012 0.012 0.745 0.745
> /home/jhaiduce/sqlvis/general2/plot.py:195(show_settings_widgets)
> 2 0.000 0.000 0.729 0.364 {method 'set_active' of
> 'gtk.ComboBox' objects}
> 2 0.000 0.000 0.728 0.364
> /home/jhaiduce/sqlvis/general2/plot.py:257(on_column_combo_changed)
> 2 0.000 0.000 0.728 0.364
> /home/jhaiduce/sqlvis/general2/eventManager.py:56(Post)
> 4 0.000 0.000 0.673 0.168
> /home/jhaiduce/sqlvis/general2/plot.py:58(Notify)
> 2 0.001 0.001 0.672 0.336
> /home/jhaiduce/sqlvis/general2/plot.py:70(refresh)
> 2 0.000 0.000 0.262 0.131
> /usr/lib/pymodules/python2.6/matplotlib/backends/backend_gtk.py:280(draw)
> 2 0.000 0.000 0.261 0.131 {method
> 'process_updates' of 'gtk.gdk.Window' objects}
>
>
> And a portion of the code from the function:
>
> for i in range(2):
> label=gtk.Label(labels[i])
>
> table.attach(label,0,1,i,i+1,xoptions=gtk.FILL,yoptions=gtk.FILL)
> label.show()
>
> field=gtk.ComboBox(liststore)
> cell = gtk.CellRendererText()
> field.pack_start(cell, True)
> field.add_attribute(cell, 'text', 0)
> field.connect('changed',self.on_column_combo_changed,axes[i])
> if i==0:
> field.set_active(self.xcolumn)
> if i==1:
> field.set_active(self.ycolumn)
>
> table.attach(field,1,2,i,i+1,yoptions=gtk.FILL)
> field.show()
>
>
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