At the moment, Servo does not use incremental compilation by default.
You can enable it by copying servobuild.example to .servobuild in your
clone of the repository and setting "incremental = true" in the [build]
section.
If you’ve done this, **you probably want to reverse it** for a while.
Incremental compilation in rustc is being rewritten and there are large
compiler performance regression when it’s enabled. These are visible as
the big increases on http://perf.rust-lang.org/
We’ve updated Servo two days ago to use a Rust Nightly version with
these regressions. I’ve measured component/script take ~5x as long to
compile as with incremental disabled.
I hear that these regressions should be fixed in the next few weeks as
the rewrite settles down in the compiler, and hopefully the new approach
can eventually give significantly better perf than before.
This talk by Niko explains the new query-based approach for compiler
internals:
https://skillsmatter.com/skillscasts/10868-inside-the-rust-compiler
--
Simon Sapin
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