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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 @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
    2. 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
    3. 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
    4. 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
    5. 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
    6. 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
    7. 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
    8. 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
    9. 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.

      4 replies 2 retweets 9 likes
    10. 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
      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.

      10:08 AM - 2 Feb 2020
      • 3 Likes
      • 𝓙𝓸𝓷𝓪𝓼 𝓑𝓮𝓷𝓳𝓪𝓶𝓲𝓷 L. 😷. Ritter Wes
      1 reply 0 retweets 3 likes
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        2. Tim Sweeney‏ @TimSweeneyEpic Feb 2
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          Replying to @TimSweeneyEpic @paniq @pkhuong

          References in managed memory are not roots. They are tracked by the GC and are only treated as live when the object they reside in is live.

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

          The technique for tracking where references live is awesomely brute-force. There's 128TB of address space, so I virtually allocate 32TB of uncommitted memory for tags, with one byte tag for each 8 bytes of address space. I then catch page faults in tag memory, commit, and track.

          1 reply 1 retweet 2 likes
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