Electron and high CPU usage on Raspberry-Pi 3

alborzs

Hi,
I have a working MM and it looks amazing :smiling_face_with_open_mouth:
The only issue is that the CPU usage of electron(s) is extremely high.

I have followed everything in the Raspberry-pi guide but when running top I get the following:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
  941 pi        20   0  400560 159456  78664 R 127.8 16.8   5:00.29 electron
  938 pi        20   0  312916  86456  70300 R  88.9  9.1   3:42.10 electron
  903 pi        20   0  487216 118084  77744 R  11.1 12.4   0:37.83 electron

Why so many instances of electron and why is the CPU usage so high? (by the way my SD card is fine and pretty much empty)

Any help would be much appreciated

bhepler

@alborzs - Which modules do you have loaded? The basic Magic Mirror isn’t terribly resource intensive. But some modules really give it a workout.

alborzs

@bhepler, is there a way to find out if/what module might be the cause of the extensive CPU usage? Other than the default modules, I only got MMM-Netatmo and MMM-ResRobot.

bhepler

@alborzs - other than the hard way, no. Remove all of the modules and then add them back one at a time with an eye on your CPU usage.

The other thing to double-check is to make sure that you have one of the OpenGL drivers active. The regular one or the fake one, it doesn’t really matter which. The non-OpenGL driver uses a lot of CPU time.

alborzs

@bhepler, that did solve the problem, One module was causing the issue. Thanks.

MrH

@alborzs Which module caused it? Sure hope it’s not ResRobot as that is my next add-on.