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DAS

How a security update threw errors in XProtect Remediator

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?

February 6, 2023 Macs, Technology

Scheduled activities: 3 launchd or 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.

February 2, 2023 Macs, Technology

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

Art and Science: 11 New paint

T T Read More

Acrylics are too chemically complex for artists to prepare themselves, containing packaged blends of polymers with surfactants, and much more.

February 22, 2022 General, Life, Painting

Art and Science: Introduction to a new series

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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.

December 9, 2021 General, Life, Painting

How to run commands and scripts on Efficiency cores

T T Read More

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.

September 14, 2021 Macs, Technology

Explainer: macOS scheduled background activities

T T Read More

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

Time Machine to APFS: Initiating an auto backup

How the start of Time Machine backups to APFS volumes is scheduled and dispatched, and a fascinating Secure Backup Daemon.

March 9, 2021 Macs, Technology

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