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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 4 Oct 2017
    • Report Tweet
    • Report NetzDG Violation

    Why does the @golang garbage collector pause all threads to scan the stack? Why not pin stack objects and go 100% nonblocking?

    5:49 PM - 4 Oct 2017
    • 6 Retweets
    • 34 Likes
    • A Mysterious stranger; no, not that one No. 1 Incel ethan geller Alejandro Martínez Ariel Mashraki Steven Wiseman Clint Samuel Alan Hard Rock
    11 replies 6 retweets 34 likes
      1. New conversation
      2. Paul Khuong‏ @pkhuong 4 Oct 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @TimSweeneyEpic @golang

        How do you know what to pin? You need a snapshot of all the thread's stacks, or a conservative approximation. Doing that w/o blocking needs a *stack* write barrier. Just taking consecutive snapshots could lose a root that moved from stack #2 to stack #1.

        2 replies 0 retweets 0 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 4 Oct 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @pkhuong @golang

        The code generator could produce explicit lock inc [http://obj.pin ] / lock dec [http://obj.pin ] for all stack references.

        1 reply 0 retweets 0 likes
      4. 6 more replies
      1. New conversation
      2. Conor Stokes, the man from online‏ @xDirtyPunkx 4 Oct 2017
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        Replying to @TimSweeneyEpic @golang

        Because scanning just the stack is very fast and the throughput costs for pinning can be quite high.

        1 reply 0 retweets 0 likes
      3. Conor Stokes, the man from online‏ @xDirtyPunkx 4 Oct 2017
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        Replying to @xDirtyPunkx @TimSweeneyEpic @golang

        A tight loop with a changing reference on the stack ends up being dominated by pinning costs.

        1 reply 0 retweets 0 likes
      4. 5 more replies
      1. New conversation
      2. Adam Rosenberg‏ @spot3d 5 Oct 2017
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        Replying to @TimSweeneyEpic @golang

        Be honest. Have you ever met a garbage collector that you liked? I sure haven't. They always eat processing time just when it's most needed.

        1 reply 0 retweets 1 like
      3. Tim Sweeney‏ @TimSweeneyEpic 5 Oct 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @spot3d @golang

        Well, no, but I’d like it very much if it could be reduced to a bearable. Instant overhead, like the cost of other acceptable abstractions.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Seamus Blackley‏Verified account @SeamusBlackley 4 Oct 2017
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        • Report NetzDG Violation
        Replying to @TimSweeneyEpic @golang

        Um, same reason all tools suck?

        1 reply 0 retweets 1 like
      3. Patrick Lavelle‏ @ChorizoFan420 4 Oct 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @SeamusBlackley @TimSweeneyEpic

        Because they are written hastily and without being tested on a real use case?

        2 replies 0 retweets 1 like
      4. 2 more replies
      1. New conversation
      2. Karthik Kumar Viswanathan‏ @_vkaku 4 Oct 2017
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        Replying to @TimSweeneyEpic @golang

        Stack, Pause and GC sound so wrong when used in a single sentence. 🤔

        1 reply 0 retweets 1 like
      3. gab.ai/murali‏ @muralipiyer 4 Oct 2017
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        Replying to @_vkaku @TimSweeneyEpic @golang

        🤣🤣 Haven't seen GO architecture but it sounds awkward

        0 replies 0 retweets 1 like
      4. End of conversation

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