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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. Rich Felker‏ @RichFelker 12 Jul 2015

      A daemon calling abort() in response to malloc failure is like depositing all your money in response to capital controls.

      1 reply 0 retweets 1 like
    2. Laurent Bercot‏ @laurentbercot 12 Jul 2015
      Replying to @RichFelker

      @RichFelker The real problem is libraries that do it. For individual executables, exiting is often the only choice that makes sense.

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 12 Jul 2015
      Replying to @laurentbercot

      @laurentbercot For a daemon? Good luck getting s6-supervise to successfully fork & exec a new one under OOM conditions...

      2 replies 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 12 Jul 2015
      Replying to @RichFelker

      @laurentbercot This issue actually came up in practice on the maradns list a few years ago. Whole dns goes down if one request OOMs.

      1 reply 0 retweets 0 likes
    5. Laurent Bercot‏ @laurentbercot 12 Jul 2015
      Replying to @RichFelker

      @RichFelker It's obviously better to specifically handle ENOMEM when you have a huge state that's costly to lose, such as a DNS cache.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 12 Jul 2015
      Replying to @laurentbercot

      @laurentbercot You lose not just the cache, but the ability to serve future requests. That's the point of my "depositing your cash" analogy.

      1:03 PM - 12 Jul 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Laurent Bercot‏ @laurentbercot 12 Jul 2015
          Replying to @RichFelker

          @RichFelker Not if your daemon is supervised: it will come back up when the crisis is over. You can't serve while there's no mem anyway.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 12 Jul 2015
          Replying to @laurentbercot

          @laurentbercot Sure you can. Serving cached or authoritative results takes no memory.

          1 reply 0 retweets 0 likes
        4. Laurent Bercot‏ @laurentbercot 12 Jul 2015
          Replying to @RichFelker

          @RichFelker Not arguing that maradns did the right thing. It didn't. (dnscache and tinydns don't have that problem; they're better designed)

          1 reply 0 retweets 0 likes
        5. Laurent Bercot‏ @laurentbercot 12 Jul 2015
          Replying to @laurentbercot

          @RichFelker Just that in some cases (NOT a DNS cache), it's just as well for your daemon to exit on oom, and be restarted when possible.

          0 replies 0 retweets 0 likes
        6. End of conversation

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