Parallel rustc is very exciting! (Thanks to @SimonSapin for making these measurements!)
See: https://internals.rust-lang.org/t/help-test-parallel-rustc/11503 …pic.twitter.com/6OuNeuoZIk
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Parallel rustc is very exciting! (Thanks to @SimonSapin for making these measurements!)
See: https://internals.rust-lang.org/t/help-test-parallel-rustc/11503 …pic.twitter.com/6OuNeuoZIk
It’s pretty amazing how fast rustc moves compared to, say, GCC or clang. MIR, parallel codegen, parallel compilation, and incremental compilation are all ways rustc is ahead right now…
Arguably, it does because it *has* to. Because at the same number of lines of code, C++ is still way faster to compile. Take Firefox, for example. Rust is less than 10% of the code base but I'm sure it's well over 20% of the CPU time (and I'm not even talking about wall time).
I would like to figure out why that is. I think some of it may be that Rust code tends to be more dense line-for-line (i.e. each line of Rust corresponds to more machine code than each line of C++). This could probably be experimentally measured.
It'd probably be interesting to measure LoC/compile unit as well. The C++ CU-per-file model is garbage but it does result in less work for the compiler per unit.
Does it? I think we’re talking about clean builds.
That's an unsubstantiated guess, but I would bet money that compiling multiple C++ source files in separate processes achieves better parallelism than rustc compiling an equivalent amount of Rust source in a single crate.
Well, for now, but the point of parallel compilation is to change that :)
Parallel compilation is unlikely to reduce total CPU time, though.
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