High CPU consumption even with auto_refresh=False #48
Description
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?
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FoamyGuy commentedon Jan 15, 2025
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 displayiowhile 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.