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Grand Central Dispatch

How macOS copes with heavy workloads on M1 cores

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How the E and P cores in an M1 Max chip cope with the heavy system workload after login, but still give the user the scope to run apps immediately.

May 26, 2022 Macs, Technology

Explainer: Parallel computing

It delivers detailed weather forecasts for days in advance, and real-time manipulation of elaborate textured 3D models. But more mundane tasks may not get any quicker.

March 12, 2022 Macs, Technology

Watching Grand Central Dispatch at Work

The aim is to be able to run commands at regular intervals using GCD rather than launchd. Here are details of the code and resulting log entries, casting light on how GCD works.

May 1, 2017 Macs, Technology

App Nap, Battery Endurance, and Grand Central Dispatch

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Despite its documentation vanishing, it’s clear that GCD does a lot more than provide an easy way to concurrency for app developers.

April 29, 2017 Macs, Technology

The Time Bomb Ticking in Sierra: Grand Central Dispatch is broken

This bug disrupts Time Machine backups and all the dozens of activities which macOS manages. It may make Sierra unsuitable for use in servers.

February 25, 2017 Macs, Technology

How Time Machine backups are launched in Sierra

macOS Sierra doesn’t run periodic backups using a simple mechanism. Here’s the story in full detail.

February 14, 2017 Macs, Technology

Last Week on my Mac: Stories of gods and Grand Central Dispatch

Working out why Time Machine backups go wrong isn’t necessarily that different from unravelling classical mythology. In some ways.

February 12, 2017 Macs, Technology

Why faster is seldom quicker

Designing algorithms which can benefit from multiple cores and GPUs is not only non-trivial, it remains desperately difficult for humans.

June 9, 2015 Macs, Technology
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