On 2/24/21 6:35 AM, John O'Hagan wrote: > Hi list > > I have a 3.9 tkinter interface that displays data from an arbitrary > number of threads, each of which runs for an arbitrary period of time. > A frame opens in the root window when each thread starts and closes > when it stops. Widgets in the frame and the root window control the > thread and how the data is displayed. > > This works well for several hours, but over time the root window > becomes unresponsive and eventually freezes and goes grey. No error > messages are produced in the terminal. > > Here is some minimal, non-threaded code that reproduces the problem on > my system (Xfce4 on Debian testing): > > from tkinter import * > from random import randint > > root = Tk() > > def display(label): > label.destroy() > label = Label(text=randint(0, 9)) > label.pack() > root.after(100, display, label) > > display(Label()) > mainloop() > > This opens a tiny window that displays a random digit on a new label > every .1 second. (Obviously I could do this by updating the text rather > than recreating the label, but my real application has to destroy > widgets and create new ones). > > This works for 3-4 hours, but eventually the window freezes. > > The process uses about 26 Mb of memory at first, and this gradually > increases to around 30 or so by the time it freezes. > > Any ideas what could be causing this, or even how to approach debugging > or workarounds? > > Thanks > > -- > > John
One thought is that repeatedly destroying and recreating a label might be leaking a resource. One option would be to change the code to just update the label rather than recreating it each time. Simplest is probably to link the Label to a StringVar instead of a fixed text and updating the variable to change the text. You can also (I believe) go into the Label and change the text it has with a configuration call. -- Richard Damon -- https://mail.python.org/mailman/listinfo/python-list
