New submission from Cristian Martinez de Morentin <cmarti...@das-nano.com>:
Hi everyone,
I have found a memory leak when using Queue and Condition from threading
library.
The issue can be reproduced with the following code:
========================================================
import queue
import threading
class MemoryTest(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.queue = queue.Queue()
self.cv = threading.Condition()
def put(self, msg):
self.queue.put(msg)
with self.cv:
self.cv.notify()
def run(self):
while True:
while not self.queue.empty():
self.queue.get()
self.queue.task_done()
with self.cv:
self.cv.wait_for(lambda: not self.queue.empty())
================================================================
If you run a MemoryTest object in another thread, by calling its start()
method, and you send it messages by using its put() method, you will see how
RAM memory usage starts increasing.
This behaviour has been observed in Windows (64 bits) with Python 3.6, 3.7 &
3.8, but not with Python 3.5.
Thank you so much.
----------
components: Windows
messages: 369443
nosy: Cristian Martinez de Morentin, paul.moore, steve.dower, tim.golden,
zach.ware
priority: normal
severity: normal
status: open
title: Memory leak in threading library with Python 3.6-3.8
type: resource usage
versions: Python 3.6, Python 3.7, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40699>
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