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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. Simon Sapin‏ @SimonSapin 12 Dec 2018
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      Replying to @eddyb_r @rustlang and

      With icecc we can distribute Gecko’s C++ files to a hundred cores across the office. Even with costly headers, throwing hardware at the problem gets us quite far. With Rust, if the crate dependency graph is narrow (i.e. if the critical path is long) there’s nothing we can do.

      2 replies 0 retweets 6 likes
    2. Manish‏ @ManishEarth 12 Dec 2018
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      Replying to @SimonSapin @eddyb_r and

      That's because icecream exists, Rust's incremental compilation *could* support something like this, it just doesn't. Yet. (it's true that writing an icecream for c++ is easier than writing one for rust because of the model, but it's not "nothing we can do")

      1 reply 0 retweets 1 like
    3. Simon Sapin‏ @SimonSapin 12 Dec 2018
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      Replying to @ManishEarth @eddyb_r and

      I meant a different we. On a scale of days/weeks, we the people in my office and me can buy more CPUs to throw at icecc but there is nothing we can do about much of Rust compilation being single-threaded.

      1 reply 0 retweets 1 like
    4. Simon Sapin‏ @SimonSapin 12 Dec 2018
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      Replying to @SimonSapin @ManishEarth and

      Sure, we the community of people working on Rust can refactor rustc internals to allow distributing the query system across machines, but that’s much harder and on a scale of years.

      1 reply 0 retweets 2 likes
    5. Patrick Walton‏ @pcwalton 13 Dec 2018
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      Replying to @SimonSapin @ManishEarth and

      Do you have a concrete proposal or suggestion for what we should have done differently in rustc?

      1 reply 0 retweets 0 likes
    6. Manish‏ @ManishEarth 13 Dec 2018
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      Replying to @pcwalton @SimonSapin

      I don't think his point is that rust has worked itself into a corner, his point is that as a *user* of rust icecc isn't currently available

      1 reply 0 retweets 0 likes
    7. Patrick Walton‏ @pcwalton 13 Dec 2018
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      Replying to @ManishEarth @SimonSapin

      I don’t get what the point of pointing that out is, other than to suggest that Rust should have used header files. If we’re going to debate the merits of header files, let’s get that out on the table.

      2 replies 0 retweets 0 likes
    8. Manish‏ @ManishEarth 13 Dec 2018
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      Replying to @pcwalton @SimonSapin

      No, the point is that *right now* c++ may be a more attractive choice for compile times for users

      1 reply 0 retweets 0 likes
    9. Simon Sapin‏ @SimonSapin 13 Dec 2018
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      Replying to @ManishEarth @pcwalton

      I’m not trying to argue for a different Rust. Only responding to Eddy’s "Rust is not really worse than C++", pointing out that the state of the world today is that introducing Stylo doubled Firefox’s build time when a few desktops with big CPUs are available to icecc.

      2 replies 0 retweets 1 like
    10. Patrick Walton‏ @pcwalton 13 Dec 2018
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      Replying to @SimonSapin @ManishEarth

      I read eddyb’s post as saying that the design of Rust is not really worse than the design of C++, as far as compilation speed is concerned. Obviously C++ has more tooling available right now; nobody denies that.

      2 replies 0 retweets 1 like
      Patrick Walton‏ @pcwalton 13 Dec 2018
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      Replying to @pcwalton @SimonSapin @ManishEarth

      (I also think this illustrates my point about there being no silver bullet: icecream is a very specific build time improvement for medium to large companies who work on large codebases. Lots of work to benefit only a fraction of the community.)

      11:45 AM - 13 Dec 2018
      0 replies 0 retweets 0 likes

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