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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. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @noop_dev @freshofftheufo @TimSweeneyEpic

      these solutions suffer from the problem that they want too much at once.

      1 reply 0 retweets 2 likes
    2. Tim Sweeney‏ @TimSweeneyEpic Feb 2
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      Replying to @paniq @noop_dev @freshofftheufo

      If garbage collection could be achieved with no pauses with a runtime cost that’s a constant fraction of overall CPU time, how much would you be willing to pay for it? 5%? 25%?

      1 reply 1 retweet 2 likes
    3. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @TimSweeneyEpic @noop_dev @freshofftheufo

      could there be a dedicated CPU core for it? if not, then i suppose smaller is always better; could also be adaptive rate: use 5% or higher, as much as is left over for the current frame.

      1 reply 0 retweets 0 likes
    4. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @paniq @TimSweeneyEpic and

      but constant runtime cost is good thinking. that makes it much easier to reason about it, and we don't get sudden stalls.

      1 reply 0 retweets 0 likes
    5. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @paniq @TimSweeneyEpic and

      is the GC available for data allocated on any thread?

      1 reply 0 retweets 0 likes
    6. Tim Sweeney‏ @TimSweeneyEpic Feb 2
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      Replying to @paniq @noop_dev @freshofftheufo

      All threads, all GC overhead being amortized across threads or in negligibly small timeslices.

      1 reply 0 retweets 2 likes
    7. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @TimSweeneyEpic @noop_dev @freshofftheufo

      i do like this kind of footprint.

      1 reply 0 retweets 0 likes
    8. Paul Khuong‏ @pkhuong Feb 2
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      Replying to @paniq

      Semi random Q: How would you feel about an allocator that intentionally slowed down threads that allocate too many GB/s in order to bound pause times?

      1 reply 0 retweets 0 likes
    9. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @pkhuong

      sounds like a heuristic that is difficult to understand in practice. e.g. most allocations happen when a level is loaded, and nobody needs artificial stalls in that scenario.

      2 replies 0 retweets 1 like
    10. L.  😷. Ritter‏ @paniq Feb 2
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      Replying to @paniq @pkhuong

      i would rather leave allocation bandwidth to profiling.

      1 reply 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic Feb 2
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      Replying to @paniq @pkhuong

      Once we abandon stop-the-world GC, there are some nice choices available. You can have a dedicated GC thread, but it's impossible to guarantee it can keep up with the garbage created by other threads. So you really need the ability for thread that allocate to help with GC.

      10:01 AM - 2 Feb 2020
      • 2 Retweets
      • 9 Likes
      • E danilo Nikolaus Pöttler 𝓙𝓸𝓷𝓪𝓼 𝓑𝓮𝓷𝓳𝓪𝓶𝓲𝓷 Jordan Ewbank Catalin Pop (1 of 42👻s of Steve Jobs Ghost) Trần Minh Tuấn L. 😷. Ritter Bojan Bozinovski
      4 replies 2 retweets 9 likes
        1. New conversation
        2. L.  😷. Ritter‏ @paniq Feb 2
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          Replying to @TimSweeneyEpic @pkhuong

          where and how would you place the roots?

          1 reply 0 retweets 0 likes
        3. Tim Sweeney‏ @TimSweeneyEpic Feb 2
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          Replying to @paniq @pkhuong

          In my case, box<t> is the type of managed references (like shared_ptr<t>, but GC instead of ARC). There are two types of memory, and the GC treats them differently. References living in unmanaged memory like the stack or C++ heap are roots.

          1 reply 0 retweets 3 likes
        4. 6 more replies
        1. Tim Sweeney‏ @TimSweeneyEpic Feb 2
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          Replying to @TimSweeneyEpic @paniq @pkhuong

          The timeslice for GC assistance can be arbitrarily small. The critical requirement for keeping memory allocation bounded is: on average, the all threads have to free abandoned objects at least as fast as they abandon objects.

          0 replies 0 retweets 2 likes
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        2. Boris Chuprin‏ @noop_dev Feb 2
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          Replying to @TimSweeneyEpic @paniq @pkhuong

          I’ll be *very* impressed if you somehow manage to defeat “stop the world” GC curse in multithreaded environment with reasonable perf and RAM cost.

          1 reply 0 retweets 0 likes
        3. L.  😷. Ritter‏ @paniq Feb 2
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          Replying to @noop_dev @TimSweeneyEpic @pkhuong

          intuitively i'd say it's not technically impossible, but i don't have time to do research.

          1 reply 0 retweets 0 likes
        4. 5 more replies
        1. New conversation
        2. sadcat‏ @Icat_irl Feb 2
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          Replying to @TimSweeneyEpic @paniq @pkhuong

          epic purchased rl still servers go down everybody? why?

          1 reply 0 retweets 0 likes
        3. L.  😷. Ritter‏ @paniq Feb 2
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          Replying to @Icat_irl @TimSweeneyEpic @pkhuong

          this is not your conversation. go elsewhere.

          0 replies 0 retweets 2 likes
        4. End of conversation

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