Re: r10997 - /branches/bieri_gui/gui_bieri/controller.py -- March 16, 2010 - 00:07

Threading in a GUI is quite different to threading in the
multi-processor code.  The multi-processor code could have threading
added to split up the calculations, the only problem is that Python
threading is not real threading.  If you have a quad-core processor,
all the threads will only run on one of the cores.  This is a Python
thread design issue.  Note that the threading here would be called a
multi-processor fabric.  The fabrics currently implemented are the
mpi4py (using MPI,
http://en.wikipedia.org/wiki/Message_Passing_Interface) and the
uni-processor.

Having threads in the GUI is quite different.  The purpose is to let
other parts of the program continue to run as another part of the GUI
is in use.  I think the relax controller is a perfect example of this.
 Threading is difficult to perfect though, because locking problems
can be difficult to understand and resolve.  Using the threading
module will help a lot for this.

Regards,

Edward


On 15 March 2010 22:24, Michael Bieri <michael.bieri@xxxxxx> wrote:
> I will also try to change the controller from a wx.Dialog to a wx.Frame.
> It might be that this already solves a lot of problems, as the dialog
> locks a lot of functions in the main loop. Ideally, we could even avoid
> using threads to catch the system output. How is the multi processor
> working? Is it one job that is split to multiple processors or does
> relax start several jobs at once (in threads) ?
>
>
>
> Edward d'Auvergne schrieb:
> > Hi,
> >
> > This should give you access to the info the relax controller needs.
> > If additional information is required, I can add this to the 1.3 line.
> >  Note that the current use of the thread python package might cause a
> > problem when reading this.  Switching to the threading module should
> > help.  As a last resort, I have written a thread safe version of the
> > status relax module that I can commit to the 1.3 line.
> >
> > Regards,
> >
> > Edward
> >
> >
> >
> > On 14 March 2010 23:45,  <michael.bieri@xxxxxx> wrote:
> >
> > > Author: michaelbieri
> > > Date: Sun Mar 14 23:45:25 2010
> > > New Revision: 10997
> > >
> > > URL: http://svn.gna.org/viewcvs/relax?rev=10997&view=rev
> > > Log:
> > > The status information of the singleton is integrated in the relaxGUI 
> > > controller.
> > >
> > > Modified:
> > >    branches/bieri_gui/gui_bieri/controller.py
> > >
> > > Modified: branches/bieri_gui/gui_bieri/controller.py
> > > URL: 
> > > http://svn.gna.org/viewcvs/relax/branches/bieri_gui/gui_bieri/controller.py?rev=10997&r1=10996&r2=10997&view=diff
> > > ==============================================================================
> > > --- branches/bieri_gui/gui_bieri/controller.py (original)
> > > +++ branches/bieri_gui/gui_bieri/controller.py Sun Mar 14 23:45:25 2010
> > > @@ -31,6 +31,9 @@
> > >  import time
> > >  import thread
> > >  import wx
> > > +
> > > +# relax module imports.
> > > +from status import Status
> > >
> > >  # relaxGUI module imports.
> > >  from gui_bieri.execution.calc_noe import make_noe
> > > @@ -68,6 +71,9 @@
> > >         # Button actions
> > >         self.Bind(wx.EVT_BUTTON, self.cancel_calculation, 
> > > self.cancel_button)
> > >         self.Bind(wx.EVT_BUTTON, self.handler_close, self.close_button)
> > > +
> > > +        # Integrate Singleton object.
> > > +        status = Status()
> > >
> > >         # Start Calculation in Thread
> > >         #if WHICH_CALC == 'Rx':
> > >
> > >
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