How to free up memory used by widgets?

[tarik setia]

I am building a kivy app.

One of the screen (Screen1) uses a lot of memory. So, when transitioning to another screen, I tend to delete the children for screen1. But even that is not freeing up the memory.

Please check the video here https://drive.google.com/file/d/1f0klta1K8Ldg63JLrqRjbns7eqQuVbrc/view

Link to app code(minimal version):

https://github.com/tariksetia/kivy_alert_app

Steps:

pip install -r requirements.txt

python app.py

the code for screen1 is in screes/alert_Detail_screen.py

Any Help is much appreciated.

Thanks in advance

Tarik

[Elliot Garbus]

I imaging you would need to force the Python garbage collector to free the memory.  Unless there is a specific reason to free memory I would be inclined to just let the GC handle it.

 

https://docs.python.org/3/library/gc.html

see gc.collect

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[tarik setia]

Memory is needs to be freed up instantly, Drawing polygon mapview causes the spike in memory, User may revisit alert details for a different alert and  each time, a new polygon will be drawn.

This causes memory usage to reach Gbs instantly.

I tried calling gc.collect() when on_leave() is triggered. But no success.

If and when your time allow, could you please take a look at the code and see if I am doing something wrong?

-Tarik

[Elliot Garbus]

Taking a look at your code:

1. You are creating a new MapView object everytime you enter the AlertDetailScreen.  I would recommend creating one MapView object in the screen in __init__(), and reusing it.

 

2. At the bottom of the alert_details_screen.py you are creating another App instance.  There can only be one App instance in a kivy app.  If this is for testing, put it under a if __name__ ==  ‘__main__’:

 

3. You are calling draw_polygons() everytime you enter the screen.  It would seen to me after you create a map, and draw on it. You would only need to redraw it if something has changed.  You are also creating a new GeoJsonMapLayer() each time.

 

If these actions don’t help. I’d also suggest looking for a python memory profiling tool so you know what is driving the memory consumption.

There is also a kivy Cache manager that keeps image data around.  You could also take a look there – but I would recommend starting by not creating new map objects every time you enter the screen.

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