feat(storage-proofs-porep): implement prefetch macro for aarch64

[dgbo]

Co-authored-by: Wang Maozhang [email protected]

This implement prefetch marco for aarch64 in storage-proofs/porep/src/stacked/vanilla/macros.rs, with prefetch hints merged into core_arch library rust-lang/stdarch-PR918 and rust-lang/rust-PR77259.

Patch delivers about 23% performance improvement in (lotus-bench seal: preCommit phase 1) with --sector-size=512MB/32GiB on Kunpeng920 aarch64 server.

[cryptonemo]

Thanks! Will see if we can find a tester for this.

[dgbo]

Thanks! Will see if we can find a tester for this.

The result on our server are very good.
Looking forward to see the results on other aarch64 based platforms.

Thanks.

[dignifiedquire]

this means that aarch64 now requires a nightly compiler, which is fine, but should be documented

[dgbo]

Thanks for the quick review.

Seems the nightly compiler requirement has been documented in README.md already:

275 ## Building for Arm64
276
277 In order to build for arm64 the current requirements are
278
279 - nightly rust compiler
280
281 Example for building `filecoin-proofs`
282
283 ```
284 $ rustup +nightly target add aarch64-unknown-linux-gnu
285 $ cargo +nightly build -p filecoin-proofs --release --target aarch64-unknown-linux-gnu
286 ```

Do we need extra comments in storage-proofs/porep/src/lib.rs before the cfg_attr line or elsewhere? Maybe something like //requires nightly, or later stable version to build for aarch64?

Best Regards.

[dignifiedquire]

ha, I forgot about that, perfect thank you!

[dignifiedquire]

thanks