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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. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 23 May 2019
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      Every time I see another poll about the @rustlang async/await syntax, I feel like it's missing the option "I just want async/await to be stable and will defer to the Rust Core team's best judgment about the syntax"

      5 replies 10 retweets 100 likes
      Show this thread
    2. mik‏ @mik235 23 May 2019
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      Replying to @bascule @rustlang

      mik Retweeted mik

      I don't currently do any Rust programming, but thread FWIW: https://twitter.com/mik235/status/1129246179835883520 … (async/await is a mistake)

      mik added,

      mik @mik235
      Everything in Javascript is async and runs in a single thread. Javascript has tried nearly all the models for dealing with that - unfortunately the best model (coroutines) is just too hard to bolt on.
      Show this thread
      2 replies 0 retweets 2 likes
    3. Chris Palmer‏ @fugueish 23 May 2019
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      Replying to @mik235 @bascule @rustlang

      Promises/async/await seem like a total hack necessary for JavaScript only. Why would languages that don’t need (Rust, C++) it adopt it? What am I missing? It’s miserable in JS, too.

      4 replies 0 retweets 5 likes
    4. Patrick Walton‏ @pcwalton 23 May 2019
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      Replying to @fugueish @mik235 and

      Because it’s the fastest of all available options. Coroutines needs stacks and are therefore slower.

      4 replies 0 retweets 6 likes
    5. Chris Palmer‏ @fugueish 23 May 2019
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      Replying to @pcwalton @mik235 and

      I don’t see how that necessarily follows, but I’ll believe you

      1 reply 0 retweets 1 like
    6. Patrick Walton‏ @pcwalton 23 May 2019
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      Replying to @fugueish @mik235 and

      It’s mostly all about malloc perf. Async/await avoids allocations (alliteration!) BTW, the syscall cost of spawning a thread on Linux is a lot less than the cost of allocating the stack.

      3 replies 0 retweets 9 likes
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    8. Patrick Walton‏ @pcwalton 23 May 2019
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      I don’t have up-to-date numbers but I know it was a pretty big difference on really high C10K-style workloads. Alex, Carl, etc. probably can cite you some benchmarks.

      0 replies 0 retweets 1 like
    9. This Tweet is unavailable.
    10. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 23 May 2019
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      Go’s concurrency model is fundamentally broken: https://songlh.github.io/paper/go-study.pdf …

      3 replies 0 retweets 1 like
      Patrick Walton‏ @pcwalton 23 May 2019
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      Replying to @bascule @valarauca1 and

      Eh, not for that reason though. Having small stacks *is* a nice advantage of GC.

      8:43 PM - 23 May 2019
      2 replies 0 retweets 0 likes
        1. Patrick Walton‏ @pcwalton 23 May 2019
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          Replying to @pcwalton @bascule and

          One interesting thing is that having userland M:N threads and small stacks are actually independent decisions, contrary to popular belief. You could have 1:1 threading and small stacks.

          0 replies 0 retweets 1 like
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        1. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 23 May 2019
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          Replying to @pcwalton @valarauca1 and

          Sure, just toss everything on a racy shared heap. What could go wrong 😜

          0 replies 0 retweets 0 likes
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