How to free ram in python

Question

I have a simple code

import cv2
import numpy as np

Image = cv2.imread('blue.jpg')

Threshold = np.zero

s(Image.shape, np.uint8) 
cv2.threshold(Image, 121, 255,   cv2.THRESH_BINARY, Threshold) 
cv2.imshow("WindowName", Threshold )

cv2.waitKey(0) 
cv2.destroyAllWindows()

I want to delete matrix

"Image"

from memeory i.e clear memory to save space in ram

How can i acheive this i am working this code on raspberry pi so

you can call the garbage collector using cg.collect(). This shouldn't be necessary though, python deals with this internally and if Image is no longer needed it will not use any memory as far as I understand. — Tobias
– Tobias, Commented Feb 15, 2016 at 17:34
The unused memory remains unavailable to other programs, though, since most operating systems don't reclaim memory from a process until the process exits. — chepner
– chepner, Commented Feb 15, 2016 at 17:35
@TobiasR can u please provide exact syntax to do as u have said — don joe
– don joe, Commented Feb 15, 2016 at 17:38
@chepner how can delete the variable and also deallocate memory — don joe
– don joe, Commented Feb 15, 2016 at 17:39
You can't, from Python. You can't give memory back to the operating system. Assuming Image is the only reference to the object, you can simply say del Image to release the memory for use by the Python script itself. — chepner
– chepner, Commented Feb 15, 2016 at 17:43

viraptor · Accepted Answer · 2016-02-17 06:05:39Z

1

del Image will likely do what you want, but there are some special cases.

It won't do anything if your image is still referenced somewhere else. Reference count has to go to 0.
It won't do anything straight-away if there's a cyclic reference inside Image (it may be freed at some later point, or maybe not at all)
It will only work this way in cPython. Any other implementation is free to handle garbage collection in a different way. Consider del to be a suggestion.

answered Feb 17, 2016 at 6:05

viraptor

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Community · Accepted Answer · 2017-05-23 12:15:34Z

0

You may want to use

del Image[:]
del Image

Actually, you don't need to do and even don't need to care about it.

Python automatically frees all objects that are not referenced any more

Refer this with very quality accepted answer how to release used memory immediately in python list?

edited May 23, 2017 at 12:15

CommunityBot

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answered Feb 17, 2016 at 6:01

Van Tr

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