Crate clf 

Flush the data cache line.

This crate can be used when you do benchmarks that are not dependent on the cpu cache.

Supports

• x86_64, aarch64 (native implementation)
• mips64el, powerpc64le … etc (fallback to __builtin_clear_cache)
• minimum support rustc 1.70.0 (due to core::arch and asm!)

Examples

Easy to use:

let a = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
clf::cache_line_flush_with_slice(&a);

or

let a = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
let begin_ptr = a.as_ptr();
let end_ptr = unsafe { begin_ptr.add(a.len()) };
unsafe { clf::cache_line_flush_with_ptr(begin_ptr, end_ptr) };

References

CPU cache

Benchmarking

To measure the effectiveness of the cache flushing, you can run the included benchmarks:

make bench

This will compare the access time of “warm” data versus “flushed” data.

Functions

cache_line_flush_with_ptr^⚠

flush the data cache line, this parameters are pointers.

cache_line_flush_with_slice

flush the data cache line, this parameter is a slice.