Re:Two years of Rust
by fnord123 on Monday May 15, 2017 @07:05PM
(#14345995)
Maven takes a long long time to start up, but once it's ready, javac is pretty quick.
Some Rust projects are very quick to build; but some are astonishingly slow to build. e.g. lalrpop is unusably slow (~15mins to build on 2014 Macbook Air).
I think the place here performance breaks down is liberal use of generic types in functions. e.g. AsPath<T> and AsRef<T>, etc.) where the compiler creates the function for all the different types and then tries to collapse them again later on. So one rules of thumb is to only use those in the public APIs and convert the type so it can be passed around without generics internally within a module. Or maybe that's just me trying to do some `cargo cult` heuristics (haha! puns!)
Some Rust projects are very quick to build; but some are astonishingly slow to build. e.g. lalrpop is unusably slow (~15mins to build on 2014 Macbook Air).
I think the place here performance breaks down is liberal use of generic types in functions. e.g. AsPath<T> and AsRef<T>, etc.) where the compiler creates the function for all the different types and then tries to collapse them again later on. So one rules of thumb is to only use those in the public APIs and convert the type so it can be passed around without generics internally within a module. Or maybe that's just me trying to do some `cargo cult` heuristics (haha! puns!)