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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Colm MacCárthaigh‏ @colmmacc Jun 29

      Have you ever needed to generate a random number in code? whether it's for rolling a dice, or shuffling a set, this tweet thread is here for you! There's no reason that it should be easy or obvious, very experienced programmers repeat common mistakes. I did, before I learned ...

      38 replies 977 retweets 2,862 likes
      Show this thread
    2. Shafik Yaghmour‏ @shafikyaghmour Jun 29
      Replying to @colmmacc

      Nice epic thread on random number generation. I came here to point out "rand() Considered Harmful" talk which is an awesome take on this https://channel9.msdn.com/Events/GoingNative/2013/rand-Considered-Harmful … and slides https://view.officeapps.live.com/op/view.aspx?src=http%3a%2f%2fvideo.ch9.ms%2fsessions%2fgonat%2f2013%2fSTLGN13rand.pptx … In C++ we discourage the use of rand() and have <random>https://stackoverflow.com/a/17798317/1708801 …

      1 reply 4 retweets 21 likes
    3. Arvid Gerstmann‏ @ArvidGerstmann Jul 1
      Replying to @shafikyaghmour @colmmacc

      I'd consider <random> harmful, too.https://arvid.io/2018/06/30/on-cxx-random-number-generator-quality/ …

      1 reply 0 retweets 5 likes
    4. Shafik Yaghmour‏ @shafikyaghmour Jul 1
      Replying to @ArvidGerstmann @colmmacc

      I am not sure it is not my specialty, it is not clear to me where these details matter. I guess cryptography and related is one of them. While your write was interesting it did not give me enough context. What if I just want to do simple Monte-carlo are they still ok?

      2 replies 0 retweets 1 like
    5. Steve Canon‏ @stephentyrone Jul 1
      Replying to @shafikyaghmour @ArvidGerstmann @colmmacc

      My 2c: it’s malpractice for the default random in a general purpose language to be anything other than a system-backed CSPRNG.

      5 replies 4 retweets 21 likes
    6. Steve Canon‏ @stephentyrone Jul 1
      Replying to @stephentyrone @shafikyaghmour and

      It’s totally okay to have a fast/seedable alternative, of course, but mt is a bizarrely stone-age choice.

      2 replies 0 retweets 2 likes
      Rich Felker‏ @RichFelker Jul 1
      Replying to @stephentyrone @shafikyaghmour and

      MT isn't even "stone age". It's "kool-aid". It was *always* worse than most other choices, even LCG.

      10:28 AM - 1 Jul 2018
      • 1 Retweet
      • 3 Likes
      • Peter Barfuss 𒀱 Steve Canon Arvid Gerstmann
      1 reply 1 retweet 3 likes
        1. New conversation
        2. Steve Canon‏ @stephentyrone Jul 1
          Replying to @RichFelker @shafikyaghmour and

          True. I’m giving a little benefit of the doubt because that wasn’t as well-known back in the dark ages.

          1 reply 0 retweets 1 like
        3. Rich Felker‏ @RichFelker Jul 1
          Replying to @stephentyrone @shafikyaghmour and

          Statistically a 128-bit LCG with just upper 32 bits used is pretty damn decent.

          2 replies 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Jul 1
          Replying to @RichFelker @stephentyrone and

          And orders of magnitude smaller than MT in state size, code size, & conceptual complexity.

          1 reply 0 retweets 2 likes
        5. Steve Canon‏ @stephentyrone Jul 1
          Replying to @RichFelker @shafikyaghmour and

          No argument here.

          0 replies 0 retweets 1 like
        6. End of conversation

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