Michiel, Thanks for the ideas. I have implemented both of the approaches you describe and I am attaching a file that has all 3 approaches. At this point, all 3 approaches work on OS X, Python 2.5 with wx 2.8/2.9. What I most need to to find strenuous test cases that can probe which of these has the best performance? Robert, could you run the Chaco test again with approaches 2 and 3 and try tuning the parameters (see the docstrings)?
Cheers, Brian On Thu, Jul 16, 2009 at 11:32 PM, Michiel de Hoon <mjldeh...@yahoo.com>wrote: > > Without monitoring stdin, you could do the following: > > while True: > run the event loop for a specified duration (say, 0.1 seconds) > check for input on stdin; if there is any: break > > But you can only do this if wx has such a time-out capability. If not, you > can do the following: > > while True: > handle all accumulated events > check for input on stdin; if there is any: break > sleep for 0.1 seconds > > The sleep is important, otherwise the CPU is busy 100% of the time, which > will drain your battery. > > This loop is essentially what you are doing in your current code, except > that you're using Python/readline for the repeated calls into the hook > function. It's better to have this loop explicitly inside your hook > function, because of the variation in PyOS_InputHook behavior between > different versions of Python/readline. > > --Michiel > > --- On Fri, 7/17/09, Brian Granger <ellisonbg....@gmail.com> wrote: > > > From: Brian Granger <ellisonbg....@gmail.com> > > Subject: Re: [matplotlib-devel] [IPython-dev] [Enthought-Dev] Ctypes > based prototype of PyOS_InputHook for wx 2.8 and 2.9 > > To: "Michiel de Hoon" <mjldeh...@yahoo.com> > > Cc: "Robert Kern" <rk...@enthought.com>, enthought-...@enthought.com, > "matplotlib development list" <matplotlib-devel@lists.sourceforge.net>, > "IPython Development list" <ipython-...@scipy.org> > > Date: Friday, July 17, 2009, 12:59 AM > > Michiel, > > > > Thanks for the reply, this will help us to find a better > > approach. According to one of the wx devs, Robin Dunn, wx > > currently does not have the ability to monitor stdin in its > > even loop without polling. I guess there is a GSoC project > > to add this capability, but it is not there yet. Any > > thoughts on how this could be done without monitoring > > stdin. I will give the polling stdin approach a try > > though. > > > > > > Cheers, > > > > Brian > > > > > > > > > > The chunkiness probably comes from the fact that > > inputhook_wx is called repeatedly. This is different from > > how PyOS_InputHook is being used in Tkinter, PyGTK, and the > > Mac OS X backend. > > > > > > > > Schematically, this is how the Tkinter/PyGTK/MacOSX event > > loops work: > > > > > > > > 1) PyOS_InputHook is called when Python is waiting for the > > user to type in the next Python command. > > > > > > > > 2) The hook function sets up the event loop such that stdin > > is being monitored while the event loop is running. > > > > > > > > 3) The hook function then starts the event loop. > > > > > > > > 4) When input is available on stdin, the hook function > > exits the event loop, and returns. > > > > > > > > This is how the proposed Wx event loop currently works: > > > > > > > > 1) PyOS_InputHook is called when Python is waiting for the > > user to type in the next Python command. > > > > > > > > 2) The hook function processes whatever events are > > available at the time. > > > > > > > > 3) The hook function returns. > > > > > > > > 4) If still no input is available on stdin, Python calls > > the hook function again via PyOS_InputHook after a timeout. > > > > > > > > I believe the timeout is 0.1 seconds by default. However, > > Python may not call PyOS_InputHook repeatedly at all; this > > depends on which Python version is being used, and the > > version of the readline library. In some configurations > > (particularly on Windows), PyOS_InputHook is called only > > once, so wx will freeze between Python commands. > > > > > > > > > > I am not familiar with wx, but there hopefully there is > > some way to monitor stdin while the event loop is running? > > > > > > > > --Michiel. > > > > > > > > > > > > --- On Thu, 7/16/09, Brian Granger <ellisonbg....@gmail.com> wrote: > > > > > > > > > From: Brian Granger <ellisonbg....@gmail.com> > > > > > Subject: Re: [matplotlib-devel] [IPython-dev] > > [Enthought-Dev] Ctypes based prototype of PyOS_InputHook for > > wx 2.8 and 2.9 > > > > > To: "Robert Kern" <rk...@enthought.com> > > > > > Cc: enthought-...@enthought.com, > > "matplotlib development list" <matplotlib-devel@lists.sourceforge.net>, > > "IPython Development list" <ipython-...@scipy.org> > > > > > > > Date: Thursday, July 16, 2009, 6:57 PM > > > > > Robert, > > > > > > > > > > Thanks for testing this so quickly. Performance is > > one of > > > > > the big issues that I am concerned about. I will > > work on a > > > > > Cython based version to see if that solves the > > problem. > > > > > > > > > > Cheers, > > > > > > > > > > Brian > > > > > > > > > > > > > > > > > > > > > > > > > Works for me with wx 2.8.8.1 on OS X 10.5 and > > > > > Chaco. Pan and zoom > > > > > > > > > > interactions are substantially chunky, though. I do > > not see > > > > > such > > > > > > > > > > chunkiness with -wthread. It would be worth exploring > > a > > > > > Cython > > > > > > > > > > alternative to see if it is just ctypes and general > > Python > > > > > overhead to > > > > > > > > > > blame. > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > Robert Kern > > > > > > > > > > > > > > > > > > > > "I have come to believe that the whole world is > > an > > > > > enigma, a harmless > > > > > > > > > > enigma that is made terrible by our own mad attempt > > to > > > > > interpret it as > > > > > > > > > > though it had an underlying truth." > > > > > > > > > > -- Umberto Eco > > > > > > > > > > _______________________________________________ > > > > > > > > > > IPython-dev mailing list > > > > > > > > > > ipython-...@scipy.org > > > > > > > > > > http://mail.scipy.org/mailman/listinfo/ipython-dev > > > > > > > > > > > > > > > > > > > > > > > > > -----Inline Attachment Follows----- > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > > > > Enter the BlackBerry Developer Challenge > > > > > This is your chance to win up to $100,000 in prizes! > > For a > > > > > limited time, > > > > > vendors submitting new applications to BlackBerry App > > > > > World(TM) will have > > > > > the opportunity to enter the BlackBerry Developer > > > > > Challenge. See full prize > > > > > details at: http://p.sf.net/sfu/Challenge > > > > > -----Inline Attachment Follows----- > > > > > > > > > > _______________________________________________ > > > > > Matplotlib-devel mailing list > > > > > Matplotlib-devel@lists.sourceforge.net > > > > > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
inputhook.py
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