On the edge of Apple Silicon memory speeds
I have developed open source CLI-tool for Apple Silicon macOS. It measures memory speeds in different ways and also latency. It can achieve up to 96-97% efficiency on read speed on M4 base what is advertised as 120GB/s. All memory operations are in assembly. I would really appreciate for results on different CPU's how benchmark works on those. I have been able to test this on M1 and M4. command : 'memory_benchmark -non-cacheable -count 5 -output results.JSON' (close all applications before running) This will generate JSON file where you find sections copy_gb_s, read_gb_s and write_gb_s…
On the edge of Apple Silicon memory speeds launched on January 17, 2026 with 5 votes, #3,400 of 14,584 launches that month and more than 75% of that year's launches.
What it does
Low-level command-line tool for measuring CPU and Metal GPU memory bandwidth, synthetic LLM decode and prefill memory traffic, cache and main-memory latency, access-pattern performance, TLB behavior, and two-thread cache-line handoff protocol latency on Apple Silicon Macs. - timoheimonen/macOS-memory-benchmark
In the maker’s words, at launch
I have developed open source CLI-tool for Apple Silicon macOS. It measures memory speeds in different ways and also latency. It can achieve up to 96-97% efficiency on read speed on M4 base what is advertised as 120GB/s. All memory operations are in assembly. I would really appreciate for results on different…
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