Bug summary

There seems to be a GPU memory leak when calling plt.figure() and plt.close() repeatedly in matplotlib version 3.5.0. Every time these two lines are ran, more and more GPU memory gets hogged up.

Code for reproduction

from matplotlib import pyplot as plt

for i in range(10000):
    plt.figure()
    plt.close()

Actual outcome

When inspecting memory usage, more and more GPU memory gets hogged up. Specifically, I ran nvidia-smi -l 1 and observed Memory-Usage increasing until it hits the GPU memory limits, which is when the process crashes.

Expected outcome

GPU memory usage should not be going up every iteration of this for loop.

Additional information

This is an issue in matplotlib version 3.5.0, but not 3.0.3.

Operating system

Ubuntu

Matplotlib Version

3.5.0

Matplotlib Backend

TkAgg

Python version

3.9.10

Jupyter version

6.4.8

Installation

pip