I have no idea what it is but I was having the a similar problem on my
Ubuntu 8.10. Funny thing is that it wasn't consistent, so whenever i
got terrible performance I restarted the app and this fixed it
temporarily. Not sure if this is related because I didn't do any
performance testing or profiling. I will test again later.

Laszlo

2009/2/12 Alessandro Dentella <san...@e-den.it>:
> Hi, since yesterday, on my linux Ubuntu 8.0.4 I'm experimenting very strange
> things that I don't see on other machines. TreeStore  'append' method is
> taking a huge amount of time as shown by this 'prun' inside ipython:
>
>   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
>      332    4.644    0.014    4.648    0.014 {method 'append' of 
> 'gtk.TreeStore' objects}
>      495    0.490    0.001    0.490    0.001 {method 'set' of 'gtk.TreeStore' 
> objects}
>
>
> the same program on a different machine:
>
>   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
>      495    0.011    0.000    0.011    0.000 {method 'set' of 'gtk.TreeStore' 
> objects}
>      332    0.004    0.000    0.007    0.000 {method 'append' of 
> 'gtk.TreeStore' objects}
>
>
>
> I'm not at all aware of any changes. I didn't upgrade any tools and I don't
> remember to have installed anything in the last 2 days.
>
> One more strangeness is that I'm having these messages:
>  Warning: /build/buildd/glib2.0-2.16.4/gobject/gsignal.c:2271: signal name
>  `selection_changed' is invalid for instance `0x88e2998'
>
> that I don't receive on other machines and I didn't receive until yesterday.
>
> doesn that give you any idea wher I could investigate to understand what
> happened?
>
>
> sandro
>
>
> --
> Sandro Dentella  *:-)
> http://sqlkit.argolinux.org        SQLkit home page - PyGTK/python/sqlalchemy
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