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Activity Monitor

Last Week on My Mac: Tuning for performance

Tuning your Mac for performance can be a good investment of time. Beware of general benchmarks, though, and develop your own objective measurements. Then identify the rate-limiting step methodically, so you can address that.

December 8, 2024 Macs, Technology

Inside M4 chips: P cores hosting a VM

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macOS virtual machines are preferentially run on P cores. Details on their performance, core allocation, frequencies and power use/

November 13, 2024 Macs, Technology

Inside M4 chips: P cores

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Details of their frequency, ISA, power use, and how macOS allocates threads to P cores and relocates them. Supported by data from an M4 Pro.

November 11, 2024 Macs, Technology

Why % CPU in Activity Monitor isn’t what you think

One of the most common reasons for opening Activity Monitor is to check the % CPU of processes that might be running out of control. How accurate are those figures, though, and should you believe them?

November 8, 2024 Macs, Technology

Why is kernel_task taking so much CPU?

Why you shouldn’t try killing kernel_task, but take action to help cool your Mac and reduce the heat it’s producing.

July 11, 2024 Macs, Technology

How to discover what Apple silicon CPU cores are doing

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How could you study how Apple silicon CPU cores are used to run code? Comparisons between Activity Monitor, Xcode Instruments, and powermetrics.

July 2, 2024 Macs, Technology

What to do when a process uses too much CPU

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The spinning beachball, a juddery interface, and fans running full pelt: what’s CPU doing in Activity Monitor, and what should you do about it?

June 15, 2023 Macs, Technology

What to do when an app uses too much memory

How to tell whether an app has a memory leak, what to do about it, and the differences from a kernel memory leak.

June 6, 2023 Macs, Technology

Making the most of Apple silicon power: 7 Virtualisation and core use

Virtual CPU cores are of one type, and QoS has no effect in virtualised macOS. This has consequences for both the host and guest macOS.

October 27, 2022 Macs, Technology

Making the most of Apple silicon power: 6 Empowering users

Many apps could benefit users of Apple silicon Macs by giving them controls over core use by their threads. Here’s how that can be done simply and effectively.

October 24, 2022 Macs, Technology

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