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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 18 Dec 2019
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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

      2 replies 16 retweets 107 likes
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    2. Patrick Walton‏ @pcwalton 18 Dec 2019
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      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…

      3 replies 3 retweets 42 likes
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    3. glandium‏ @MikeHommey 18 Dec 2019
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      Replying to @pcwalton @SimonSapin

      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).

      3 replies 0 retweets 2 likes
      Patrick Walton‏ @pcwalton 18 Dec 2019
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      Replying to @MikeHommey @SimonSapin

      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.

      7:01 PM - 18 Dec 2019
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        2. Ted Mielczarek‏ @TedMielczarek 18 Dec 2019
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          Replying to @pcwalton @MikeHommey @SimonSapin

          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.

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton 18 Dec 2019
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          Replying to @TedMielczarek @MikeHommey @SimonSapin

          Does it? I think we’re talking about clean builds.

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