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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. Tim Sweeney‏ @TimSweeneyEpic 26 Dec 2019
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      Using the holidays for a 2-week coding session. Writing a new transactional memory manager that’s O(1) for all operations, completely non-blocking and progress-guaranteeing, and uses atomics only for writes.

      31 replies 39 retweets 736 likes
      Show this thread
    2. Tim Sweeney‏ @TimSweeneyEpic 26 Dec 2019
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      All transactions are applied in a sequential order, but can run in parallel as long as there are no read-write conflicts. The big cost: all values > 48 bits in size must be heap-allocated. For this I wrote a non blocking concurrent garbage collector a couple years ago.

      3 replies 1 retweet 55 likes
      Show this thread
    3. Tim Sweeney‏ @TimSweeneyEpic 26 Dec 2019
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      The “trick” is to store a 10-bit transaction id inside variables and use that to resolve conflicts. Any transaction can undo any earlier one, and can be undone by any later one, at any time, with detection at read and write points.

      4 replies 2 retweets 87 likes
      Show this thread
      Tim Sweeney‏ @TimSweeneyEpic 26 Dec 2019
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      I view this algorithm as the last hope for performant software transactional implementations since the .NET team’s efforts failed and all experiments show hash table indirection adds too much overhead.

      10:12 AM - 26 Dec 2019
      • 5 Retweets
      • 103 Likes
      • Volcano339 🌴🔥Mavreon Studios🔥🌴 STRAKY sobrevive al corona virus? Yes Colin Riddell AkaashYT S Ben Gamble James Koss
      11 replies 5 retweets 103 likes
        1. New conversation
        2. corvus frugilegus‏ @glaebhoerl Jan 2
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          Replying to @TimSweeneyEpic

          Are you familiar with this effort? https://github.com/mtak-/swym/  (blog posts: https://mtak-blog.github.io/generalizing-seqlocks …, https://mtak-blog.github.io/are-we-lock-free-yet …) (Or does that use "hash table indirection"? Sorry, not familiar with which part of the system the hash table resides in in the alluded-to experiments.)

          1 reply 0 retweets 2 likes
        3. Tim Sweeney‏ @TimSweeneyEpic Jan 2
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          Replying to @glaebhoerl

          Similar in the use of sequence numbers to indicate ownership of privatized data. Big difference is I’m nonblocking and writing eagerly, with the ability to undo other tx or be undone at any time.

          0 replies 0 retweets 3 likes
        4. End of conversation
        1. Vincent Stimpson‏ @Stimpanzee 26 Dec 2019
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          Replying to @TimSweeneyEpic

          How long until Unreal becomes its own operating system?

          0 replies 0 retweets 3 likes
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        1. New conversation
        2. Matt Heimlich‏ @mattheimlich 27 Dec 2019
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          Replying to @TimSweeneyEpic

          Any links to more info on the .NET team's failed attempts?

          1 reply 0 retweets 1 like
        3. Jan Gray‏ @jangray 29 Dec 2019
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          Replying to @mattheimlich @TimSweeneyEpic

          Jan Gray Retweeted Jan Gray

          https://twitter.com/jangray/status/478256038739587072 …

          Jan Gray added,

          Jan Gray @jangray
          Replying to @jangray
          5/ Good retrospective on our work by Joe Duffy http://joeduffyblog.com/2010/01/03/a-brief-retrospective-on-transactional-memory/ … @lobrien
          0 replies 0 retweets 2 likes
        4. End of conversation
        1. Mark Papadakis‏ @markpapadakis 26 Dec 2019
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          Replying to @TimSweeneyEpic

          Will you perhaps release that codebase later ?

          0 replies 0 retweets 2 likes
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        1. rangarajan_k‏ @prince_warhero 26 Dec 2019
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          Replying to @TimSweeneyEpic

          How long before you add a Shopping cart to your store

          0 replies 0 retweets 2 likes
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        1. Stalwart Sweeper Stan‏ @Lilgamer9000 26 Dec 2019
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          Replying to @TimSweeneyEpic

          Tim you are the best

          0 replies 0 retweets 0 likes
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        1. Matt Lintott‏ @mattlintott 26 Dec 2019
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          Replying to @TimSweeneyEpic

          pic.twitter.com/uJBWuwXOLn

          0 replies 0 retweets 0 likes
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        1. Jens-T‏ @GamezoneGAF 26 Dec 2019
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          Replying to @TimSweeneyEpic

          All I want for Christmas is shopping cart, I won't even wish for snow.

          0 replies 0 retweets 0 likes
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