Last month, one morning, my MacBook (still running Catalina) started behaving strangely - though I was not running anything, it was sluggish as the CPU was too busy and the fans were on high. I traced it to the iOS Simulator service that comes with XCode.
The logging tool (weirdly called Console.app), had crash reports
com.apple.CoreSimulator.CoreSimulatorService was stuck in a crash loop (start.. crash, start... crash, start... crash, back off for a while... and repeat):
I have no idea what caused it, since I haven’t used XCode in ages. I also don’t find any update around that time (System Information.app > Software > Installations sorted by Install Date).
Anyway, simulator commands that may help someone are:
xcrun simctl list- List available devices, device types, runtimes, or device pairs.
xcrun simctl delete unavailable all- Delete spcified devices, unavailable devices, or all devices.
xcrun simctl erase all- Erase a device's contents and settings.
For me, I also got rid of XCode, and re-installed it. So far so good...
The spelling mistake above is as per the description in the