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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 16 Jul 2018
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    Thinking about garbage collection: is there any graph theory analog to the Fourier Transform? A new space derived from the objects-and-references space which enables asymptotically more efficient determination or update of liveness? Bloom filter mojo?

    4:57 PM - 16 Jul 2018
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    7 replies 10 retweets 55 likes
      1. This Tweet is unavailable.
      2. Tim Sweeney‏ @TimSweeneyEpic 16 Jul 2018
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        Replying to @JonOlick

        UObject base layout did this in the early days. Doesn’t scale well to inheritance, though, and automatic sequential prefetching by the CPU seems to help. Really the problem with Unreal GC isn’t the amortized overhead - like 0.1%, it’s the single-threaded pause time.

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      2. BrendanEich‏Verified account @BrendanEich 16 Jul 2018
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        Replying to @gafferongames @TimSweeneyEpic

        AKA the Kingdom of Nouns. https://steve-yegge.blogspot.com/2006/03/execution-in-kingdom-of-nouns.html …

        3 replies 0 retweets 12 likes
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      1. Federico Vaggi‏ @F_Vaggi 16 Jul 2018
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        Replying to @TimSweeneyEpic

        To the first question: yes. The reference is here: https://ieeexplore.ieee.org/document/6494675/ …. There's also tricks for computing the Fourier transform on graph faster.

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      2. ethan geller‏ @pragmatism 16 Jul 2018
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        Replying to @TimSweeneyEpic

        Unless your graph is time variant, you can express it as a state space filter: https://ccrma.stanford.edu/~jos/fp/State_Space_Filters.html … Old school control sys folks use them a lot. Once you get your graph in a state space representation you can gauge its frequency response

        1 reply 0 retweets 6 likes
      3. Aaron McLeran‏ @minuskelvin 16 Jul 2018
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        Replying to @pragmatism @TimSweeneyEpic

        These are specifically time-varying. Discrete time, but all computers use discrete time so nbd.

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      1. Stephen Judkins‏ @stephenjudkins 16 Jul 2018
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        Replying to @TimSweeneyEpic

        I've wondered about this. I suspect non-deterministic GC could be a fruitful research program; it's really not a problem if a certain % of the space is wrongly marked as live at any given point, as long as the chance converges to 0 eventually

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      1. Cogito ergo Mecagoendios‏ @Elrohir_Ancalin 16 Jul 2018
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        Replying to @TimSweeneyEpic

        The FT is the SVD of a Toeplitz matrix. Maybe if your incidence matrices had a specific structure there would be a transform for it (wavelets?). But I don't think there can be a general form for "all graphs" since the set of all arbitrary matrices includes the uncompressible ones

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      1. Paul Khuong‏ @pkhuong 16 Jul 2018
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        Replying to @TimSweeneyEpic

        Spectral graph theory I guess, but I don't think that has much grip on digraphs yet.

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