----- Original Message ----- 
From: "Michael P. Reilly" <arcege@[...].net> 
To: <tutor@[...].org> 
Sent: Wednesday, June 12, 2002 9:16 PM
Subject: Re: [Tutor] Continuously slower program


>  
>  I'm enclosing the changes that I had made; maybe it can help you.
>  
>    -Arcege
>  

I downloaded and ran your program and it worked well. 
However, when looking at the running the meter one 
observes every 10 to 15 seconds (on my machine) a 
sudden slowdown for half a second approximately. So this,
I think, is a visualization of garbage collection - 
which could be problematic when programming for instance 
actino games or some sorts of animation.

There come the following questions to my mind:

- Is it possible to distribute garbage collection
  smoothely over the entire process or to control
  its occurence in some other way?
- Where comes this g.c. from? Which part of the program
  uses that memory, which has to be cleared up? (Maybe
  some repeatedly generated local variables in the
  math - stuff?)
- Does the g.c. come from the Python interpreter or
  from the underlying Tcl/Tk?

Thanks in advance for your insight creating remarks

Gregor

P.S.: I also observe, that there are Tkinter programs,
which produce really strange error messages when closed
properly (by clicking on the windows-closing icon 'X'):

....
  File "C:\Python22\lib\lib-tk\Tkinter.py", line 1927, in coords
    self.tk.splitlist(
TclError: invalid command name ".8642816.8647440"

whereas others don't do that. Who knows, which 
feature of a TKinter program is responsible
for this unfriendly behaviour and how to avoid it.




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