Comment by jasonthorsness
5 days ago
If you are sweating this level of performance, are larger gains possible by switching to C, C++, Rust? How is Rust for micro-managing memory layouts?
5 days ago
If you are sweating this level of performance, are larger gains possible by switching to C, C++, Rust? How is Rust for micro-managing memory layouts?
You need to do the exact same kinds of thing in C/C++/Rust. I believe Rust struct layout is not guaranteed to match program order unless you use an annotation forcing it (repr(C)). (So to answer the question: it's great; as good as any other language for micromanaging layout.)
Yes, without repr(C) order and padding isn't guaranteed. You would use https://docs.rs/crossbeam-utils/latest/crossbeam_utils/struc... or similar to force fields not being on the same cache line.
huh TIL
"On modern Intel architectures, spatial prefetcher is pulling pairs of 64-byte cache lines at a time, so we pessimistically assume that cache lines are 128 bytes long."
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