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Apple silicon

Tune for Performance: Do you really need a big internal SSD?

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Why pay an extra $600 for a 2 TB internal SSD, after all fast external SSDs are cheaper. Maybe you need to check whether disk performance becomes a rate-limiting factor.

December 12, 2024 Macs, Technology

Tune for Performance: Activity Monitor’s CPU view

The CPU view in Activity Monitor is the starting point for tuning the performance of software. Here are its virtues, and a few vices to beware of when using it.

December 11, 2024 Macs, Technology

Tune for Performance: do more threads run faster?

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Discovering whether using more threads makes a task faster gives insight into where its performance is limited. How to use a VM to investigate this.

December 10, 2024 Macs, Technology

Inside M4 chips: CPU core management

A first attempt to describe how macOS decides for a thread which type of core, which cluster, which core, what frequency, and how mobile it should be.

December 5, 2024 Macs, Technology

How is Thunderbolt 5 doing so far?

TB5 promises twice the data transfer rate of TB3, and three times that when supporting external displays. How close is it to achieving those?

December 4, 2024 Macs, Technology

Managing kernel extensions

It’s time to review old kernel extensions, and uninstall those no longer needed. Here’s how to do that, using uninstallers or manually.

December 3, 2024 Macs, Technology

Inside M4 chips: Controlling frequency

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How macOS controls CPU P core cluster frequency according to the cluster total active residency, in synthetic in-core tests, compression and when running virtual machines.

December 2, 2024 Macs, Technology

Inside M4 chips: Matrix processing and Power Modes

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A matrix multiplication test appears to be run on the AMX matrix co-processor, and behaves differently from in-core tests. And what Power modes really do.

November 27, 2024 Macs, Technology

Inside M4 chips: CPU power, energy and mystery

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Power use in two in-core performance tests, by number of threads run, leading to estimates of total energy used by P and E cores running the same code, at high frequencies. How efficient are the CPU cores in the M4?

November 25, 2024 Macs, Technology

A brief history of Mac CPUs

From the first 8 MHz Motorola 68000, through PowerPCs reaching 2.5 GHz and more in up to 4 cores, and Intel x86 with up to 28 cores, to Apple’s M4 Max with 12 P cores at 4.5 GHz.

November 23, 2024 Macs, Technology

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