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M4 chips: E and P cores
Less glamorous than the P cores, E cores are used to run background threads. Details of their architecture, how threads are managed on them and their efficiency.
In the two previous articles (links at the end), I explored some of the features and properties of Performance (P) cores in Apple’s latest M4 chips. For this purpose, I used a tight loop of floating point calculations, running at two different Quality of Service (QoS) settings, in macOS 15.1. CPU power use was inevitably dominated by the ten P cores running at 100% active residency and maximum frequency, remaining at just under 14,000 mW.
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