Xcode Canvas Simulator cause multiple diagnosticd processes to run and 100% CPU

Developer Tools & Services Xcode Xcode Xcode Previews

Created Aug ’23

Replies 28

Boosts 20

Views 5.2k

Participants 27

The Xcode Canvas Simulator (for Xcode 14 and even 15 ..beta 6) cause multiple springboard and diagnosticd processes to run at nearly 100% CPU , cause the MacBook M1 to heat. This happens every time. This is usually triggered after the Canvas show an error which live previewing the code as I edit it.

I have tried clearing the derived data but it doesn't seem to help. This happens with all projects. I am unable to use live previews because of this issue.

The are often other processes with the string Poster in them. Like PhotosPosterProvider , CollectionsPoster , ExtragalacticPoster running high on usage at the same time.

Screenshot 2023-08-17 at 7.34.46 PM.png

Answered by Developer Tools Engineer in 774761022

FYI: This is fixed in iOS 17.2, which is in Xcode 15.1

Boost

basileus21 OP

Nov ’23

I have the same (or similar) issue. SpringBoard getting over 100% CPU load and the computer is overheating when I launch Xcode. Workaround, which seem to work quite well, is to Force Quit SpringBoard in Activity Monitor every time I start Xcode session. Then the process is reinstated, but with the normal usage.

I run Xcode: Version 15.0.1 (15A507) My computer: MacBook Air M1, 16GB, macOS Sonoma, 14.1.1

pungme OP

Nov ’23

I can confirm that the problem with Xcode preview still persists. However, with simulators, you can avoid this by selecting the GPU as 'Prefer Integrated GPU'

Developer Tools Engineer OP

Apple

Dec ’23

Accepted Answer

FYI: This is fixed in iOS 17.2, which is in Xcode 15.1