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.
power
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?
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.
macOS virtual machines are preferentially run on P cores. Details on their performance, core allocation, frequencies and power use/
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.
Using a combination of iohid and BatteryCenter, macOS checks attached UPS and wireless keyboards, mice and trackpads ever 2-5 seconds.
Please protect your Macs from mains voltage surges and sudden loss of power using a UPS. Here’s how to select and use one.
Do external SSDs draw so much power that they’re likely to exceed that available from Thunderbolt or USB4? What would the consequences be in terms of heat?
How the NEON vector processor, neural engine, matrix co-processor, and GPU all deliver high performance with low power and energy use.
Running threads at different frequencies on the same core type can’t save energy and extend battery endurance. That’s where 2 core types come in handy.
The Eclectic Light Company 