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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. Manish‏ @ManishEarth 22 Apr 2019
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      Replying to @ManishEarth @graydon_pub @stephentyrone

      In Rust's case I wrote up an autobatching scheme years ago, requiring a straightforward three way PR classification, but doing it well requires more CI budget than we have right now. Probably could deploy a simpler version of it that gets us some wins.

      1 reply 0 retweets 4 likes
    2. Graydon Hoare‏ @graydon_pub 22 Apr 2019
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      Replying to @ManishEarth @stephentyrone

      I mean I'm nowhere near the purse strings but this has literally been an issue off-and-on since I .. uh .. left the project. We were having an argument over it that very week. It means prioritizing cycle time in a way that seems to resist all rational planning. I don't get it.

      1 reply 0 retweets 4 likes
    3. Graydon Hoare‏ @graydon_pub 22 Apr 2019
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      Replying to @graydon_pub @ManishEarth @stephentyrone

      Like if someone with the correct authority said "we don't do any more feature work or bug fixing or anything until cycle time is down to 10 minutes", it would get solved. It's not like compilers that bootstrap and self-test that fast (without $infinite_aws_bill) can't be written.

      2 replies 0 retweets 10 likes
    4. Patrick Walton‏ @pcwalton 22 Apr 2019
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      Replying to @graydon_pub @ManishEarth @stephentyrone

      I’m fine with investing in automatic rollups (the fact that we have to do them bugs me too), but you lost me at “stop all feature/bug fix work until the compiler is 10x faster”.

      1 reply 0 retweets 3 likes
    5. Patrick Walton‏ @pcwalton 22 Apr 2019
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      Replying to @pcwalton @graydon_pub and

      I’m not even convinced it’s possible for Rust to compile that fast without simplifying the language a lot. Even if it were, you’re talking about a complete rewrite of major subsystems. Like either “rewrite the whole typechecker” or “rewrite LLVM”.

      2 replies 0 retweets 8 likes
    6. Patrick Walton‏ @pcwalton 22 Apr 2019
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      Replying to @BRIAN_____ @graydon_pub and

      Can you describe how to make rustc 10x as fast? Everyone says that of course it’s possible, 10x is easy to get, it’s just that nobody cares about compiler perf, etc. etc., And then everyone who tries ends up with, like, a perf boost of 10% if that.

      3 replies 0 retweets 3 likes
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    8. Patrick Walton‏ @pcwalton 23 Apr 2019
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      Replying to @sayrer @BRIAN_____ and

      The self-hosting nature of the compile means that there is a strong serial bottleneck. The build time is not something that a caching build system will help with. Believe me, if it were, we’d have fixed that long ago.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 23 Apr 2019
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      Replying to @BRIAN_____ @sayrer and

      We already cache LLVM in the rustc build system! It’s just that we don’t appear to in *Travis* for whatever reason. It’s important to understand the problems first before jumping on Bazel as the solution. I don’t think this is a build issue at all.

      1:48 PM - 23 Apr 2019
      1 reply 0 retweets 0 likes
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