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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 Jan 30
    • Report Tweet
    • Report NetzDG Violation

    Some new performance data, showing hoe a wide multi-issue core like Intel Skylake can crunch the overhead of nonblocking concurrent garbage collected data types. Multiprecision integer addition, sub-48-bit case: 3 clock cycles; heap allocated case: 250 clock cycles.

    8:35 PM - 30 Jan 2020
    • 3 Retweets
    • 79 Likes
    • alarick 🥺 🌴🔥Mavreon Studios🔥🌴 Kate Cristian Cornea Gerlad Felicia Brisc ⁵ Nicholas Woodfield Code : NZ79 #ad AkaashYT
    7 replies 3 retweets 79 likes
      1. Tim Sweeney‏ @TimSweeneyEpic Jan 30
        • Report Tweet
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        Copy a reference: 6 cycles. Read a transactional variable: 25 cycles. Write or read-modify-write a transactional variable: 40 cycles. Can probably be optimized a bit further.

        3 replies 1 retweet 34 likes
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      2. Diego Alvarez‏ @Kekis2014 Jan 30
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        Replying to @TimSweeneyEpic

        Your programming knowledge is mind boggling for a CEO...

        2 replies 2 retweets 5 likes
      3. Lucas7yoshi // Fortnite Leaks & stuff‏ @Lucas7yoshi Jan 30
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        Replying to @Kekis2014 @TimSweeneyEpic

        Dude built the company up by being a developer and making the original Unreal stuff so it shouldn't be surprising More surprising is a CEO who has been a CEO since the beginning of a company

        1 reply 1 retweet 14 likes
      4. 1 more reply
      1. GTS_Mudkers (Wreck Stan)‏ @GTS_Mud Jan 30
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        Replying to @TimSweeneyEpic

        Thank you Tim very cool

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      1. lad‏ @goonsaxy Jan 31
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        Replying to @TimSweeneyEpic

        yes.

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      2. Jeff Smith‏ @JeffSmith888 Jan 31
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        Replying to @TimSweeneyEpic

        What are your primary use cases for the pervasive multiprecision integer math? It's not obvious to me where that's required instead of FP or just int math with rigorous overflow detection. My concern is less for amortized costs for cycles than for I$ and BP/BTB space.

        1 reply 0 retweets 0 likes
      3. Paul Khuong‏ @pkhuong Jan 31
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        Replying to @JeffSmith888 @TimSweeneyEpic

        folk PL stats say there are steeply diminishing returns in regular (non crypto / number theory) code after 2x your word size (i.e., [u]int128). OTOH, branching on OF should have minimal overhead on code that doesn't need it… ok w/ optimistically specialized bblocks/functions?

        1 reply 0 retweets 2 likes
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      1. Khalid_Diaa_Mady‏ @KhalidDiaaMady1 Jan 31
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        Replying to @TimSweeneyEpic

        I wanna sell my idea for fortnite game and for you - check inbox from me please ))

        0 replies 0 retweets 1 like
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