Xcode 16.3 repeatedly log causing CPU leak

Developer Tools & Services Xcode
SonaYu
SonaYu OP
Created 2w
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Xcode 16.3 repeatedly logs a same message very frequently, as fast as a single thread can. I use Instruments and Console and find out the log is:

Needs flush!

by -[DNTBrotliDecoder decodeBytes:length:] in DNTDocumentationSupport.

The call is on a single non-main thread. I've tried to clear caches and it seems doesn't change. Yet I don't know exact point when the logging starts since launch.

Fortunately, this thread is dispatched at E cores, bringing approximately 2 watts of power load to my Mac.

Environments:

  • macOS 15.4 (24E248)
  • Xcode 16.3 (16E140)
  • M4 chip

Replies  2
Boosts  2
Views  100
Participants  2
picnicbob
picnicbob OP
1w

I have the same problem and my documentation indexing always gets stuck at about 15%. I've deleted the entire ~/Library/Developer folder with no change. • macOS 15.4 (24E248) • Xcode 16.3 (16E140) • M4 Pro (14-core) Mac mini

1
SonaYu
SonaYu OP
1w

Problem persists and behaves in the same way in a fresh macOS 15.5 beta (24F5042g). I used UTM as a Virtualization environment.

bringing approximately 2 watts of power load to my Mac

I'm new to Apple silicon therefore I wrongly measured the power consumption. It seems to be 0.15W ~ 0.2W on M4 and 6W on virtualized M4.

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Xcode 16.3 repeatedly log causing CPU leak
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