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CoreDuet

Scheduled activities: 2 Running the activity

How running a background task takes a tiny fraction of second, although the task itself takes seconds or minutes, and why it’s run on E cores.

January 30, 2023 Macs, Technology

Scheduled activities: 1 Scheduling by DAS

How macOS schedules tasks like making automatic Time Machine backups, from property list to transactions between DAS and CTS.

January 23, 2023 Macs, Technology

How macOS schedules background activities

The story of how Mac OS X went from cron, to launchd, and ended up with Duet Activity Scheduler, to schedule background activities like backups.

January 21, 2023 Macs, Technology

Explainer: macOS scheduled background activities

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Prior to 10.4, Mac OS X used cron, then scheduling became part of the job of launchd. Later Apple added a new subsystem, Duet Activity Scheduler, which continues to evolve.

September 10, 2021 Macs, Technology

Why are my Mac’s fans running at full blast?

By default, your Mac’s cooling fans run at full blast. Only the control system slows them down when it is safe to do so. How to diagnose and fix its problems.

July 18, 2018 Macs, Technology

Last Week on My Mac: The awesome power of the Duet

If Apple manages the performance of iOS, does it do the same with macOS? What is there to stop that from being used against us?

December 24, 2017 Macs, Technology
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