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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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    1. Tim Sweeney‏ @TimSweeneyEpic 14 Jul 2018
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      After 3 months of coding weekends, my attempt to create a relocating nonblocking garbage collector in C++ has failed. It works in theory, but in practice the read barrier is pervasive and costly, and the threading invariants are incredibly tricky to maintain.

      11 replies 18 retweets 127 likes
      Show this thread
    2. Andrew Haining ☭ ☸️ ☮️‏ @1stCLord 14 Jul 2018
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      Replying to @TimSweeneyEpic

      In my experience people who use garbage collectors spend more time managing resources than people who don't, it's a solution looking for a problem and with tech like arc and raii it's even more redundant

      2 replies 0 retweets 4 likes
      Tim Sweeney‏ @TimSweeneyEpic 14 Jul 2018
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      Replying to @1stCLord @sombrero_kid

      That’s a controversial but plausible statement in mainstream programming practice (despite Unreal and Unity history). It definitely doesn’t hold in the case of code based largely on immutable data structures and shallow copying as in a functional language.

      4:04 PM - 14 Jul 2018
      • 1 Like
      • A Mysterious stranger; no, not that one
      2 replies 0 retweets 1 like
        1. New conversation
        2. Tim Sweeney‏ @TimSweeneyEpic 14 Jul 2018
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          Replying to @TimSweeneyEpic @sombrero_kid

          In this later case (the context of my weekend experiment), the question of “is anybody referencing this data structure” isn’t manageable either locally or globally, so garbage collection is the only possible memory management strategy.

          2 replies 0 retweets 3 likes
        3. Andrew Haining ☭ ☸️ ☮️‏ @1stCLord 14 Jul 2018
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          Replying to @TimSweeneyEpic

          I'm not sure i see why vanilla reference counting can't be used, is it the synchronisation cost?

          1 reply 0 retweets 1 like
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        2. Wouter‏ @wvo 17 Jul 2018
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          Replying to @TimSweeneyEpic @sombrero_kid

          Functional programming is very suitable for memory management based on linearity / uniqueness typing / ownership models, because a) you don't have shared mutability problems (see: Rust) and b) you can freely copy if it suits you without disturbing object identity.

          1 reply 0 retweets 1 like
        3. Wouter‏ @wvo 17 Jul 2018
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          Replying to @wvo @TimSweeneyEpic @sombrero_kid

          That can give you fast in-place updates with functional semantics, without GC/refc overhead. It can even be wonderful for concurrency since whole linear data structures can be passed between threads without copying.

          1 reply 0 retweets 0 likes
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