I’ve been learning Rust a bit for tinkering with CLI tools (if curious… GitHub - MilesCranmer/rip2: A safe and ergonomic alternative to rm ). One thing I noticed is that the compilation time is super fast – even faster than Julia precompilation, let alone TTFX. I’m wondering what sorts of things are…

I think i’m rehashing what others have said a bit, but in essence I believe the difference in compile time performance is due to 3 things. Rust has spent a loot of dev time improving their compile times in the last couple years, leading to very nice improvements while julia has spent most of it’s …

Something that prompted me to ask this was trying out evcxr , which has a Jupyter kernel for rust . It looks like this: [Screenshot 2024-04-19 at 20.19.20] Try it out if curious. It is kind of crazy. Each time you run a cell, it is actually compiling and then executing the code. I thought this wou…

Btw rust benchmarks and profiles the compilation of clap among other crates on every commit. You can see the results here rustc performance data , it takes 2.6s from scratch and .2s if there’s been no change. And here’s the profile on the latest commit rustc performance data . One reason why Julia mi…

[image] Zentrik: Btw rust benchmarks and profiles the compilation of clap among other crates on every commit. You can see the results here rustc performance data , it takes 2.6s from scratch and .2s if there’s been no change. And here’s the profile on the latest commit rustc performance data . …

Julia precompilation involves running the functions, in particular, Commonicon runs the complete test suite to precimpile. Maybe that’s why. If rust performs an incremental compilation after a change, that’s probably closer to what you get using Revise.

[image] lmiq: If rust performs an incremental compilation after a change, that’s probably closer to what you get using Revise. Rust uses demand-driven compilation and is expected to use salsa-rs in the future. Incremental compilation In Detail - Rust Compiler Development Guide A …

Note that Julia’s precompilation caching is parallelized at the package level with no cached intermediates. With Rust you have intermediate object file(*.o) that can be reused per source file - just like any statically compiled language. For a single package, compare with the following. cargo clea…

[image] MilesCranmer: Interactive Julia is obviously much faster, but It was wild to me that the compile times are so fast in Rust you can actually have a decent REPL. I don’t know how Apple did, but Swift, another compiled programming language that uses LLVM, has a REPL with a debugger. …

[image] mkitti: For this reason, there are attempts to replace the LLVM compiler backend with the WASM based cranelift backend. Definitely not replace :slight_smile: There was some brainstorming about a cranelift backend for Julia a while back, but it hasn’t gone anywhere: Cranelift: a faste…

[image] tgross35: There is work to parallelize the frontend too, currently available on nightly, which will add another nice speed boost when it becomes stable. Crates compile in parallel where allowed by the dependency graph. There is a post on Rust’s blog about this. The speed increase is v…

[image] lmiq: Julia precompilation involves running the functions, in particular, Commonicon runs the complete test suite to precimpile. Maybe that’s why. Um… this is completely false. Comonicon.jl doesn’t even depend on PrecompileTools. I’m talking about precompiling Comonicon.jl itself – th…

Why is rust compilation faster than Julia pre-compilation?

Internals & Design

xiaoxi April 20, 2024, 12:16pm 6

Rust uses demand-driven compilation and is expected to use salsa-rs in the future.

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Why is rust compilation faster than Julia pre-compilation?

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