Hi John, I confirm your memory leakage on the code you sent, on a Windows 7 machine running python 2.7 / Tk 8.5
And when one comments out the c.itemconfigure line, memory usage is constant, so the problem is there. And looking in Tkinter.py, the itemconfigure method on a Canvas object calls _configure on the base class, but the problem is not on the Tkinter side, it is in Tk. Mick On Thu, Nov 11, 2010 at 11:32 PM, John McMonagle <jmcmona...@velseis.com> wrote: > Hi, > > I have an application that configures thousands of canvas rectangle > items per second and I have noticed that the memory usage leaks badly. > > The code below illustrates the problem: > > #--------------------------------------------------------------- > import Tkinter as tk > import random > > r = tk.Tk() > > c = tk.Canvas(r) > c.pack(fill=tk.BOTH, expand=tk.YES) > > # draw 400 rectangles > objs = [] > for i in range(20): > for j in range(20): > obj = c.create_rectangle(i*10, j*10, i*10+10, j*10+10, > fill='#888888', outline='#888888') > objs.append(obj) > > def run(): > # loop indefinitely and randomly change the canvas item colours > while True: > obj = random.choice(objs) > red = random.randint(0,255) > green = random.randint(0,255) > blue = random.randint(0,255) > colour = '#%02x%02x%02x' %(red, green, blue) > c.itemconfigure(obj, fill=colour, outline=colour) > r.update() > > tk.Button(r, text='Run', command=run).pack() > tk.Button(r, text='Close', command=r.destroy).pack() > > r.mainloop() > #---------------------------------------------------------------------- > > So as you can see, each iteration of the while loop just does an > itemconfigure on a random item on the canvas and then an update to > process the redraw. > > I've tried periodically deleting the canvas items and redrawing them and > even periodically destroying the Canvas object itself and restarting > from scratch. Alas, memory is never released. So, I come to the > conclusion that the memory leak must be in the Tcl/Tk interpreter. > > Is there any way of forcing the Tcl/Tk interpreter to release memory ? > > Can anyone help shed some light on this mystery ? > > Regards, > > John McMonagle > _______________________________________________ > Tkinter-discuss mailing list > Tkinter-discuss@python.org > http://mail.python.org/mailman/listinfo/tkinter-discuss > _______________________________________________ Tkinter-discuss mailing list Tkinter-discuss@python.org http://mail.python.org/mailman/listinfo/tkinter-discuss
