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stjepang's profile
Stjepan Glavina
Stjepan Glavina
Stjepan Glavina
@stjepang

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Stjepan Glavina

@stjepang

async runtimes and concurrency primitives in @rustlang he/they (available for hire)

Berlin, Germany
stjepang.github.io
Joined October 2009

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    Stjepan Glavina‏ @stjepang 11 Jun 2018
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    A new version of crossbeam-channel is published. This channel in Rust works almost identically to channels in Go. It supports select operation and is fast. Now we just need to make it work with futures. :) Benchmarks: https://i.imgur.com/tRI4HMO.png  Docs: https://docs.rs/crossbeam-channel/0.2.0 …

    8:53 AM - 11 Jun 2018
    • 79 Retweets
    • 223 Likes
    • Top Kek, Esq. dave harper Ethan Buchman Drew LeSueur Christopher Schultes Tamara Roberson 🏳️‍🌈 st33med⬡ Chris Allen🇻🇦(Καλό Πάσχα!) Ivan Mandura
    6 replies 79 retweets 223 likes
      1. New conversation
      2. Rodolphe Fouquet *Bite my shiny quarantine* 🐍‏ @RodolpheFouquet 11 Jun 2018
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        Replying to @stjepang

        What's super impressive, is that Go's performance aren't that bad!

        1 reply 0 retweets 2 likes
      3. Stjepan Glavina‏ @stjepang 11 Jun 2018
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        Replying to @RodolpheFouquet

        Agreed - I read a lot of unfair criticism directed towards Go's channels, often about performance. But the more time I spend studying them, the more I appreciate the thought and care put into their design and implementation!

        1 reply 0 retweets 4 likes
      4. 2 more replies
      1. New conversation
      2. Jonas Schievink‏ @sheevink 11 Jun 2018
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        Replying to @stjepang @rustlang

        Impressive, what makes it so fast?

        1 reply 0 retweets 1 like
      3. Stjepan Glavina‏ @stjepang 11 Jun 2018
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        Replying to @sheevink @rustlang

        This design by @dvyukov is what makes it fast, and is the main source of inspiration: https://docs.google.com/document/d/1yIAYmbvL3JxOKOjuCyon7JhW4cSv1wy5hC0ApeGMV9s/pub … The short story is: channels avoid lock contention as much as possible - the typical "happy path" is lock-free. Plus, there is a lot of small optimizations that add up.

        1 reply 0 retweets 8 likes
      4. 2 more replies
      1. New conversation
      2. Patrick Walton‏ @pcwalton 11 Jun 2018
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        Replying to @stjepang @nokusu

        Do you anticipate any problems with making crossbeam-channel work with futures?

        1 reply 0 retweets 0 likes
      3. Stjepan Glavina‏ @stjepang 11 Jun 2018
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        Replying to @pcwalton @nokusu

        It's not obvious how to reconcile the task notification model with the thread notification mechanism behind crossbeam-channel. Related: https://github.com/rust-lang-nursery/futures-rs/issues/800 … Fortunately, I think we've got this figured out. The only real problem I expect is that it might take a lot of work. :)

        0 replies 0 retweets 4 likes
      4. End of conversation
      1. New conversation
      2. James Brown‏ @Roguelazer 11 Jun 2018
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        Replying to @stjepang

        the "return error if all possible peers have hung up" behavior in mpsc channels is super-nice for ensuring all threads get killed on a panic (especially early in development); curious why you dropped it and what you would propose as a replacement

        1 reply 0 retweets 2 likes
      3. Stjepan Glavina‏ @stjepang 12 Jun 2018
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        Replying to @Roguelazer

        That was a tough decision with tradeoffs both ways, but in the end it simplified the interface a lot. Rationale: https://github.com/crossbeam-rs/crossbeam-channel/issues/39 … An argument by Russ Cox: https://github.com/golang/go/issues/18511#issuecomment-270425548 … Fortunately, it's possible to simulate the old behavior: https://github.com/crossbeam-rs/crossbeam-channel/blob/master/examples/mpsc.rs …

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Andrew Vijay‏ @andrewvijay 11 Jun 2018
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        Replying to @stjepang

        What do the charts imply? Any info for newcomers?

        1 reply 0 retweets 0 likes
      3. Box<Pin<Michael<Home>>> + 'corona‏ @mgattozzi 11 Jun 2018
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        Replying to @andrewvijay @stjepang

        The smaller the bar the better. So given a certain amount of input for each type of channel constrained in different ways how well does it do? The less time it takes to process the input the faster the channel is. Basically this implementation destroys other channels in perf!

        1 reply 0 retweets 3 likes
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