David Talkin <dtal...@gmail.com> added the comment:
Attached please find a Python script that demonstrates the bug.
David
On Tue, Sep 25, 2018 at 2:55 AM Karthikeyan Singaravelan <
rep...@bugs.python.org> wrote:
>
> Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:
>
> Thanks for the report David. Feel free to attach reproducible script if
> any that might trigger this. I am adding Serhiy who might have a better
> understanding of this. Relevant issue where _createbytearray was added :
> issue21580 .
>
> ----------
> nosy: +serhiy.storchaka, xtreak
>
> _______________________________________
> Python tracker <rep...@bugs.python.org>
> <https://bugs.python.org/issue34794>
> _______________________________________
>
----------
Added file: https://bugs.python.org/file47821/leak_demo.py
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34794>
_______________________________________
#!/usr/bin/python
#
#
# Copyright 2018 David Talkin.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""This demonstrates that Tkinter.PhotoImage leaks memory with each data update.
To see the leak, run this as a main program and watch memory usage on
the system monitor. The leak occurs in LeakDemo.ShowImage.
"""
import sys
import math
import Tkinter as tk
import numpy as np
__author__ = 'dtal...@gmail.com (David Talkin)'
class LeakDemo(object):
"""Demonstrates the memory leak due to calls to TkApp._createbytearray.
"""
def __init__(self, height=600, width=1000):
self.height = height
self.width = width
self.root = tk.Tk()
self.frame = tk.Frame(self.root)
self.frame.pack()
self.canvas = tk.Canvas(self.frame, height=self.height,
width=self.width)
self.canvas.pack(side=tk.TOP, expand=tk.YES, fill=tk.BOTH)
self.image = None
self.photo = None
self.phase = 0.0
def MakeSignals(self):
"""Create signals that will modulate the red, blue and green
intensities in the image. Return them as a three-element list of
numpy arrays.
"""
freqs = [5.0, 7.0, 9.0]
sigs = []
amp = 128.0
for freq in freqs:
arg = math.pi * 2.0 * freq / self.width
ara = np.zeros(self.width, dtype=np.float32)
for i in range(self.width):
ara[i] = amp * math.sin(self.phase + (arg * i))
sigs.append(ara)
self.phase += math.pi / 100.0
return sigs
def CreateImage(self, sigs):
"""Accept a list of three arrays that represent the red, blue and
green intensities across the canvas. Return a PPN-format image to be
displayed.
"""
odata = np.array(sigs).transpose().flatten()
amax = 128
if len(odata) > self.width * 3:
odata = odata[:self.width * 3]
head = 'P6\n%d %d\n%d\n' % (len(odata)/3, self.height, amax)
bdata = head + (np.array([min(amax, max(0, (128 + v) / 2))
for v in odata],
dtype=np.uint8).tostring() * (self.height))
return bdata
def ShowImage(self, image_data):
"""The leak happens here when PhotoImage is instantiated an after each
call to configure.
"""
if not self.photo:
self.photo = tk.PhotoImage(master=self.root, data=image_data,
format='PPM')
self.image = self.canvas.create_image((1 + self.width) / 2,
(1 + self.height) / 2,
image=self.photo)
else:
self.photo.configure(data=image_data)
def RunDemo(self):
sigs = self.MakeSignals()
image = self.CreateImage(sigs)
self.ShowImage(image)
self.root.after(33, self.RunDemo) # About 30 frames/second.
def Main(unused_args):
demo = LeakDemo()
demo.RunDemo()
tk.mainloop()
if __name__ == '__main__':
Main(sys.argv)
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