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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. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe Mar 3
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      I wonder if there are lots of programmers out there who understand recursion perfectly well but don't trust it because they learnt induction arguments later in life, haven't completely internalized them, and so don't entirely believe them in their guts (so to speak)

      27 replies 3 retweets 39 likes
      Tim Sweeney‏ @TimSweeneyEpic Mar 3
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      Replying to @sigfpe

      I think the problem is more like, will my program crash if I use more than 32KB of stack? And what is the stack anyway nowadays? It’s actually pretty hard to find this out across platforms, versus everyone intuitively knowing they can use malloc till they exhaust all memory.

      5:20 PM - 3 Mar 2020
      • 21 Likes
      • Tikhon Jelvis Ray Lee Wes Marc St-Jacques Shiv Keshav Kini D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i Edward Kmett Chris Pioli
      5 replies 0 retweets 21 likes
        1. New conversation
        2. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe Mar 3
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          Replying to @TimSweeneyEpic

          True. But I see plenty of resistance even when it's easy to bound stack usage. (And yeah, it's weird how stack is a valuable resource we need to manage but it's pretty difficult to do the job of managing it.)

          2 replies 0 retweets 3 likes
        3. Boltzmann Brain Think Tank‏ @PLT_cheater Mar 3
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          Replying to @sigfpe @TimSweeneyEpic

          That's why I've always wanted a language with a type system that can track code complexity (in terms of time, resource usage, etc). It could even be Haskell - but every value would need to have multiple, independent, types (not tuples of types).

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. shachaf‏ @shachaf Mar 3
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          Replying to @TimSweeneyEpic @sigfpe

          I'd like to have compilers help me with this. With acyclic call graphs, they should statically compute the maximum stack use of a function; with cycles, I'd like to be able to provide a bound or something (and be able to fail usefully if the bound is exceeded, rather than crash).

          2 replies 0 retweets 3 likes
        3. Tim Sweeney‏ @TimSweeneyEpic Mar 3
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          Replying to @shachaf @sigfpe

          Interesting. I’d only want the assurance that the stack can grow up to some significant fraction of available machine memory and then that it would safely fault without introducing insecurity.

          1 reply 0 retweets 3 likes
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        2. Sidharth Juyal‏ @chunkyguy Mar 4
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          Replying to @TimSweeneyEpic @sigfpe

          Sidharth Juyal Retweeted Sidharth Juyal

          It’s 512KB for iOS frameworks. This information is hidden very deep in the documents. Can’t even tell if it’s the latest state https://twitter.com/chunkyguy/status/1234851061820727297?s=21 …https://twitter.com/chunkyguy/status/1234851061820727297 …

          Sidharth Juyal added,

          Sidharth Juyal @chunkyguy
          Found this gem pic.twitter.com/7AiVE3j4DO
          1 reply 0 retweets 0 likes
        3. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe Mar 4
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          Replying to @chunkyguy @TimSweeneyEpic

          That's the worst of all worlds! Reserving a big chunk of stack even though you end up using the heap anyway.

          3 replies 0 retweets 2 likes
        4. 1 more reply
        1. Arne Schober‏ @Khipu_Kamayuq Mar 3
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          Replying to @TimSweeneyEpic @sigfpe

          Tail recursion more or less works on most Compilers nowadays. Nevertheless it would still be nice to force it on a tailcall in debug builds or have an error in the (rare) occurrence when the compiler fails to tailcall.

          0 replies 0 retweets 0 likes
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        1. Matt McIrvin‏ @mattmcirvin Mar 4
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          Replying to @TimSweeneyEpic @sigfpe

          When I moved away from working on 1990s-era laser printers it was actually hard to leave the mindset that every malloc was going to fail with high probability (and trigger a complicated concurrent reclamation cycle before it finally failed).

          0 replies 0 retweets 0 likes
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