Memory Benchmark | Not Hacker News!

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4d ago

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Results with version 0.52.4:

Macbook Air M1 Bandwidth & latency: Main Memory Bandwidth Tests (multi-threaded, 8 threads): Read : 58.63377 GB/s (Total time: 9.15634 s) Write: 33.19277 GB/s (Total time: 16.17433 s) Copy : 58.52319 GB/s (Total time: 18.34729 s)

Main Memory Latency Test (single-threaded, pointer chase): Total time: 21.11410 s Average latency: 105.57 ns

Macbook Air M1 Patterns: Sequential Forward: Read : 58.573 GB/s Write: 33.202 GB/s Copy : 58.712 GB/s

Sequential Reverse: Read : 62.390 GB/s (+6.5%) Write: 33.116 GB/s (-0.3%) Copy : 59.786 GB/s (+1.8%)

Strided (Cache Line - 64B): Read : 31.476 GB/s (-46.3%) Write: 16.584 GB/s (-50.1%) Copy : 38.262 GB/s (-34.8%)

Strided (Page - 4096B): Read : 6.288 GB/s (-89.3%) Write: 14.165 GB/s (-57.3%) Copy : 8.610 GB/s (-85.3%)

Random Uniform: Read : 5.282 GB/s (-91.0%) Write: 15.219 GB/s (-54.2%) Copy : 8.259 GB/s (-85.9%)

Mac Mini M4 Bandwidth & Latency: Main Memory Bandwidth Tests (multi-threaded, 10 threads): Read : 114.74709 GB/s (Total time: 4.67873 s) Write: 68.55840 GB/s (Total time: 7.83086 s) Copy : 105.60609 GB/s (Total time: 10.16742 s)

Main Memory Latency Test (single-threaded, pointer chase): Total time: 19.47850 s Average latency: 97.39 ns

Mac Mini M4 Patterns: Sequential Forward: Read : 114.754 GB/s Write: 65.959 GB/s Copy : 105.532 GB/s

Sequential Reverse: Read : 70.724 GB/s (-38.4%) Write: 37.437 GB/s (-43.2%) Copy : 88.743 GB/s (-15.9%)

Strided (Cache Line - 64B): Read : 35.369 GB/s (-69.2%) Write: 18.655 GB/s (-71.7%) Copy : 52.914 GB/s (-49.9%)

Strided (Page - 4096B): Read : 9.072 GB/s (-92.1%) Write: 24.492 GB/s (-62.9%) Copy : 12.979 GB/s (-87.7%)

Random Uniform: Read : 6.342 GB/s (-94.5%) Write: 21.752 GB/s (-67.0%) Copy : 11.142 GB/s (-89.4%)

user_timo

2d ago

Note that in this application version Sequential Forward is multithreaded, rest single.

user_timo

18 days ago

A quick clarification: on Apple Silicon there is no user-space equivalent of x86 CLFLUSH, so the benchmark can’t force cold caches between runs. Cache behavior is inferred via buffer sizing, warm-up, and steady-state measurements.

user_timo

18 days ago

Built a small macOS memory benchmark for Apple Silicon.

Measures cache latency (pointer chase) and memory bandwidth (read/write/copy). ARM64-native.

Looking for feedback on methodology and results across different M-series chips. I have been able to test this on M4 Mac mini and M1 MacBook Air.

Can be installed with Brew.

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