[IPython-user] Problems with IPython and gtk-win32-devel-2.6.10-rc1.exe/pygtk-

Fernando Perez Fernando.Perez at colorado.edu
Mon Oct 31 08:53:31 CST 2005

Sean M. Moore wrote:
> I installed IPython yesterday to try it out, worked fine including the
> pylab mode
> Today, I decided to update my python install as some of the 
> packages were getting a bit crufty, and now I am having some
> problems with IPython.
> Actually IPython runs fine, but if I run -pylab, it runs really slowly -
> like every character you type, you watch the cursor go back to the
> start of the line, and then move back to the end, and then accept
> the next charater, must be a couple of seconds for each character.
> Needless to say this is excruciatingly painful.  

Mmh, this looks like a thread/timer related issue.  I can't test win32 right 
now, but can you play with the TIMEOUT parameter a little in the Shell.py 
file?  Try making it larger/smaller and see if that helps any.

Also, try changing the default bytecode switching interval for threads.  You 
can get the current value (normally 100) with

In [2]: sys.getcheckinterval
------> sys.getcheckinterval()
Out[2]: 100

and change it with:

In [3]: sys.setcheckinterval?
Type:           builtin_function_or_method
Base Class:     <type 'builtin_function_or_method'>
String Form:    <built-in function setcheckinterval>
Namespace:      Interactive

     Tell the Python interpreter to check for asynchronous events every
     n instructions.  This also affects how often thread switches occur.

By playing with these two parameters you may find a combination that makes 
life tolerable again.  I'd like to have a better answer for you, but I don't 
know enough about GTK threading to say anything of real value, I'm afraid. 
Let us know what playing with these two parameters gives you, and we'll take 
it from there.



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