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> now I see it's rust: how parallel is your build, really?

Not the OP but I install a lot of Rust projects with Cargo and recently did some benchmarking on DigitalOcean's compute-optimized VMs. Going from 8 cores to 32 cores was a little disappointing:

Bat (~40 crates): 68s -> 61s

Nushell (486 crates): 157s -> 106s

Compilation starts out highly parallel and then quickly drops down to a small number of cores.

The target arch doesn’t matter for the change-build-test loop d vs do. All that matters is how fast can you compile your code to test it.

If the final x86 production build takes longer it doesn’t matter - that happens on the cloud anyway.

Edit: Rust builds are very parallel until linking. No different than any other LLVM build.

> The target arch doesn’t matter for the change-build-test loop d vs do.

It matters when comparing CPU performance, which is what this benchmark is being used for.

that the arm backend is faster to compile for is a legit advantage for the developer though, even if its distinct from cpu perf