Measuring Apple M4 Cache Latency Using Rust
A Rust microbenchmark was used to measure cache latency in the Apple M4 processor. Results validate the L1 and L2 structure.
The Apple M4 processor provides insights into its L1 and L2 caches, allowing users to identify CPU-visible cache boundaries. An experiment utilized a Rust microbenchmark on 128-byte cache lines, revealing that the E and P cluster transitions occur around 6.8 MiB and 26.7 MiB, respectively. This aligns with the known 4× ratio of their L2 capacities, although it does not confirm the existence of a system-level cache in the M4.
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