[maemo-developers] python2.5 - unnecessary multiple processes forked

[From: Jayesh Salvi]

Thanks for all the info. I am planning to run the FileChooserDialog in a
different process than my rest of the app. That may sound weird, but it fits
my application's context alright. My pygtk app will run as a service, so
that it can be invoked by other applications as well. FileChooserDialog is
just one entry point into my app.

Detail of my app if you are interested: It is a pygtk GUI that lets you
upload images to Flickr or Picasaweb. I have already published the code as
Gimp, Inkscape plugins<http://code.google.com/p/altcanvas/wiki/GimpPublishr>.
Now I am putting the same code on maemo. I will soon release a .deb file
once I iron out some wrinkles.

Thanks,
Jayesh

On 1/2/08, Eero Tamminen <eero.tamminen at nokia.com> wrote:
>
> Hi,
>
> ext Jayesh Salvi wrote:
> >> I'm not sure but think it is because of gnome-vfs. Don't know proper
> >> terminology but maybe each vfs 'provider' in the dialog (like mmc,
> phone
> >> etc.) starts new process or something like that.
> >>
> >> That sounds correct. I experimented with other dialogs that do no
> involve
> > filesystem access (NamePasswordDialog, SortDialog), and they do not fork
> any
> > extra processes.
>
> They are not processes, but gnome-vfs worker threads
> (you don't want the UI to freeze e.g. until network timeouts).
>
>
> > So this behavior seems valid for FileChooserDialog. But then I should be
> > able to cleanup those extra processes when I am done with the
> > FileChooserDialog. I called destroy() on the dialog object, but that
> doesn't
> > help.
>
> They remain in the gnome-vfs thread pool even after the UI component
> is destroyed.
>
> The memory usage issue is elsewhere.  You could look into your
> program Private_Dirty memory usage in /proc/PID/smaps file.
> Or run the same program on your PC under Valgrind Massif plugin:
>         http://maemo.org/development/tools/doc/valgrind
>         http://valgrind.org/docs/manual/ms-manual.html
>
> I'm not sure how well that tells about issues in Python code.
> Is there any memory profiler for Python applications?
>
>
>         - Eero
>



-- 
---
Jayesh
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