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performance

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

How Thunderbolt 5 can be faster or not

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What TB5 actually provides in its Symmetric and Asymmetric modes, why those are most important to connect Mac to dock or hub, and how that can go wrong.

December 9, 2024 Macs, Technology

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: 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

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

Inside M4 chips: CPU core performance

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In-core performance compared across P and E cores in M1, M3 and M4 chips shows substantial performance improvements, particularly in vector and matrix computation.

November 20, 2024 Macs, Technology

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