this post was submitted on 14 Aug 2024

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Which is more important for rust compilation: higher number of cores or faster single core performance? (self.rust)

submitted 1 month ago by Timely_Jellyfish_2077 to c/rust

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Planning to build a PC in couple of weeks.

What is the optimal number of cores to have without having diminishing returns?

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[–] BB_C 10 points 1 month ago (1 children)

for a build of your crate only: single core perf.

Until the parallel compiler feature (-Z threads=<n>) stabilizes and becomes more complete.

It's also always worth mentioning that the choice of linker is important. Using mold or lld can significantly speed things up in some use-cases.

Beyond that, codegen-units and lto profile options are also important.

And finally, for development purposes, the code generator is important, as cranelift provides much faster compile times, but resulting binaries are not as optimized as LLVM-generated ones.

[–] verstra 1 points 1 month ago

Oh, i have to try these out to see if it effects my development cycle. I do notice that cargo check is super fast, but cargo build takes a long time. So codegen and linker could be the source of slowness.