You’ve just installed an update to macOS security software, then it gives you a status of ‘Unknown’ caused by [] and stops working. What’s wrong?
DAS
While macOS uses DAS-CTS to schedule hundreds of background activities, third-parties normally use launchd. Comes with a full diagram explaining DAS-CTS.
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.
How macOS schedules tasks like making automatic Time Machine backups, from property list to transactions between DAS and CTS.
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.
Acrylics are too chemically complex for artists to prepare themselves, containing packaged blends of polymers with surfactants, and much more.
From linear perspective projection, synthetic pigments like Prussian Blue, and colour theory, to the first new painting medium since oils, science and painting have developed together.
Although there doesn’t appear to be any straightforward way to run command tools or scripts only on Efficiency cores, there are ways and means.
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.
How the start of Time Machine backups to APFS volumes is scheduled and dispatched, and a fascinating Secure Backup Daemon.
The Eclectic Light Company 