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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 14 Jul 2018
    • Report Tweet
    • Report NetzDG Violation

    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.

    12:01 PM - 14 Jul 2018
    • 18 Retweets
    • 127 Likes
    • Morten Vassvik Andre Weissflog Miguel A. Polo 💻🐒 Brandon Paddock Dionisio Blanco はむ! Tom Porter Bridges Dietmar Suoch Rutvik Patel
    11 replies 18 retweets 127 likes
      1. Tim Sweeney‏ @TimSweeneyEpic 14 Jul 2018
        • Report Tweet
        • Report NetzDG Violation

        Now I see why the best relocating collectors, like Microsoft's for .NET, "stop the world" at critical times. That's not workable in general C++ code though, and won't scale to many-core. Conclusion: A non-relocating concurrent garbage collector will be optimal.

        11 replies 10 retweets 65 likes
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      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
      3. 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.

        2 replies 0 retweets 1 like
      4. 7 more replies
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      2. Federico Vaggi‏ @F_Vaggi 14 Jul 2018
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        Replying to @TimSweeneyEpic

        There are a few paid versions for Java: is there something about Java semantics that makes it easier to do there ?

        1 reply 0 retweets 0 likes
      3. RJ‏ @shajorjita 14 Jul 2018
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        Replying to @F_Vaggi @TimSweeneyEpic

        JVM is implemented in c/c++. So, if it's possible in Java, it should be possible in c

        1 reply 0 retweets 1 like
      4. 9 more replies
      1. Doug C.‏ @Ziflinz 15 Jul 2018
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        Replying to @TimSweeneyEpic

        Trying to get a GC that's usable/optimal in regular C++ was a pain, so we ended making a new C#-like language that compiled to C/C++. The code cleanliness went way up, reflection was always correct, and other GC optimizations were then possible as we could inject code as needed.

        0 replies 1 retweet 2 likes
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      1. Luke‏ @Lucretia9000 14 Jul 2018
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        Replying to @TimSweeneyEpic

        I’m surprised that you’re surprised by this.

        0 replies 0 retweets 2 likes
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      2. Jason DiCioccio‏ @jd_screenhero 15 Jul 2018
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        Replying to @el_se3dy_ @TimSweeneyEpic

        I was pretty excited about D a few years ago, but I couldn't get over the GC used in the standard library with a language that was supposed to rival C++. If that bothers you as well, you may want to give Rust a look.

        0 replies 0 retweets 2 likes
      3. End of conversation
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      2. Mark McCubbin‏ @MarkMcCubbinDev 14 Jul 2018
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        Replying to @TimSweeneyEpic

        Why is this in anyway desired in a performant system ? Would love to hear examples where you feel this would be advantageous versus using domain specific management of memory pools.

        1 reply 0 retweets 0 likes
      3. ¤ Robert Walker ¤‏ @WalkingOlof 15 Jul 2018
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        Replying to @MarkMcCubbinDev @TimSweeneyEpic

        What’s is a performant system ? There are plenty of frameworks that run on top of a GC platform, that achive great domain performance, look at Akka for example, while can’t be used in for example a hard real-time scenario.

        2 replies 0 retweets 1 like
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