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High CPU consumption even with auto_refresh=False #48

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monojk opened this issue Sep 19, 2024 · 1 comment · May be fixed by adafruit/Adafruit_Blinka_Displayio#143
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High CPU consumption even with auto_refresh=False #48

monojk opened this issue Sep 19, 2024 · 1 comment · May be fixed by adafruit/Adafruit_Blinka_Displayio#143

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@monojk
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monojk commented Sep 19, 2024 •
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I noticed 100% CPU with my application on a Raspberry Pi, even I have several seconds sleep in my loop. I use auto_refresh = False

I can reproduce that behaviour with these modifications of examples/displayio_ssd1306_simpletest.py

from time import sleep
...
display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=WIDTH, height=HEIGHT, auto_refresh=False)
...
display.auto_refresh = False        # just to be sure

while True:
    display.refresh()
    sleep(5)

How can I bring down the CPU usage?
@FoamyGuy
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I believe this is not specific to the SSD1306, but more generally with the way BlinkaDisplayIO works.

You can see this effect if you open a REPL and just import displayio while watching htop.

I'm not certain of all of the specifics but I think there is a background thread getting used during some part of the process for rendering that is running as soon as displayio gets imported.

@FoamyGuy FoamyGuy linked a pull request Jan 15, 2025 that will close this issue
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smol sleep inside background loop FoamyGuy/Adafruit_Blinka_Displayio
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@FoamyGuy @monojk