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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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    1. Saoirse Shipwreckt‏ @withoutboats 14 Jan 2019
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      Second post about wakers, this time about wakers they care which thread they’re woken fromhttps://boats.gitlab.io/blog/post/wakers-ii/ …

      2 replies 6 retweets 22 likes
    2. corvus frugilegus‏ @glaebhoerl 15 Jan 2019
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      Replying to @withoutboats

      > Using atomic reference counts. Since your application is single threaded, on x86 at least this should have essentially no overhead over using nonatomic reference counts. This has been mentioned elsewhere but it is unfortunately not true that uncontended atomics are cheap.

      1 reply 0 retweets 1 like
    3. corvus frugilegus‏ @glaebhoerl 15 Jan 2019
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      Replying to @glaebhoerl @withoutboats

      corvus frugilegus Retweeted Eric Niebler

      relevant thread [the blog post linked there is new to me and is open in a tab, I also linked a pdf]https://twitter.com/ericniebler/status/1081765425011216384 …

      corvus frugilegus added,

      Eric Niebler @ericniebler
      Replying to @BrookeHodgman @JoshuaBarczak and 8 others
      100x? That sounds incredibly high. Have you benchmarked this?
      1 reply 0 retweets 0 likes
    4. Saoirse Shipwreckt‏ @withoutboats 15 Jan 2019
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      Replying to @glaebhoerl

      Obviously extremely situational & if that’s the case there are implementation strategies without atomically

      1 reply 0 retweets 0 likes
    5. Saoirse Shipwreckt‏ @withoutboats 15 Jan 2019
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      Replying to @withoutboats @glaebhoerl

      Also I don’t think the specific cited problem applies here, the whole point is your program is single threaded so there’s no other core reading from that cacheline

      1 reply 0 retweets 0 likes
    6. Saoirse Shipwreckt‏ @withoutboats 15 Jan 2019
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      Replying to @withoutboats @glaebhoerl

      It has been pointed out that it can in theory suppress optimizations since the compiler can’t prove it would be UB for concurrent access to happen. I don’t think that’s relevant in this use case (and there are alternative strategies)

      1 reply 0 retweets 0 likes
    7. corvus frugilegus‏ @glaebhoerl 15 Jan 2019
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      Replying to @withoutboats

      It's not just that, AFAIU (simplifying it, probably) it blocks every other instruction while it goes through the pipeline, so that's something like 10 cycles * 4 ops/cycle cost at a minimum (and yeah, "no other core accessing the cacheline" is what uncontended means:)

      1 reply 0 retweets 0 likes
    8. Stjepan Glavina‏ @stjepang 15 Jan 2019
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      Replying to @glaebhoerl @withoutboats

      A simple test, FWIW: Added a drop(task.clone()) to Tokio's notify() to see how much will two additional atomic operations affect overall perf. The reactor benchmark got 2% worse, and it's not even representative of the real world since it just notifies a dummy I/O task in a loop.

      1 reply 0 retweets 2 likes
    9. corvus frugilegus‏ @glaebhoerl 15 Jan 2019
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      Replying to @stjepang @withoutboats

      Also fwiw I'm not trying to argue for or against anything here (especially in futures/tokio) it's really not my area, just to provide context wrt the cost of atomics. I wish this were the default mode of communication...

      2 replies 0 retweets 4 likes
    10. Stjepan Glavina‏ @stjepang 15 Jan 2019
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      Replying to @glaebhoerl @withoutboats

      I appreciate it! Tbh, although removing LocalWaker seems like the way to go, a part of me is a little worried so now I'm trying to verify how much performance is *really* affected.

      1 reply 0 retweets 1 like
      Stjepan Glavina‏ @stjepang 15 Jan 2019
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      Replying to @stjepang @glaebhoerl @withoutboats

      Here's a better benchmark that measures the difference between Arc and Rc:https://github.com/aturon/rfcs/pull/16#issuecomment-454529643 …

      11:59 AM - 15 Jan 2019
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      0 replies 0 retweets 1 like

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