Bitbar: BitBar process has a constant CPU usage (of ~1%) even when idle

[daniele-orlando]

Platform: MacOS 10.13.2
Version: 1.9.2

Given BitBar with 2 plugins installed with a refresh interval of 10 minutes each
Then the BitBar expected CPU usage should be 0% during the idle time
And should raise only when the 10 minutes elapse.

Current implementation of BitBar has a notable impact on the battery usage.

[jefflenz]

Any updates to this? I'm noticing this as well. Why is CPU so high for an idle bitbar?

[gingerbeardman]

I built the current code and ran it through Instruments, and nothing looked obviously wrong. Most time is spent system calls on the Main Thread:

• NSApplication, 75% of the time
  
  
  
  • CFRunLoop, 60%
  
  
  • Observers, 25%
  
  
  • Timers, 20%
  
  
  • Queue, 15%
  
  

I had a quick look through the code and I have seen slightly better CPU usage by changing:

https://github.com/matryer/bitbar/blob/master/App/BitBar/ExecutablePlugin.m#L80
from
DISPATCH_QUEUE_PRIORITY_DEFAULT
to
DISPATCH_QUEUE_PRIORITY_BACKGROUND

Feel free to try that and report back?