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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5

      Megacorps be like "we optimize for productivity not performance" then take 4 years to maybe fix a minor bug

      5 replies 17 retweets 227 likes
    2. Casey Muratori‏ @cmuratori Jul 5
      Replying to @TylerGlaiel

      MS: "These C++ class hierarchies and RAII and containers and 5,000,000 files are necessary for the code to be maintainable." User: "How long would it take to fix this bug?" MS: "Maybe two years? Three? Honestly, we probably can't, no one understands how this code works."

      2 replies 4 retweets 78 likes
    3. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @cmuratori @TylerGlaiel

      RAII is definitely good, though. Had to fix many native resource leaks in C# and Java. Very few in C++, and every one that I can think of is because someone tried to do some raw C style lifetime thing and goofed it up.

      2 replies 0 retweets 2 likes
    4. Casey Muratori‏ @cmuratori Jul 5
      Replying to @scottmichaud @TylerGlaiel

      RAII is not good at all. Arenas are always the better choice.

      3 replies 0 retweets 9 likes
    5. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @cmuratori @TylerGlaiel

      You mean pre-allocated memory pools? You can do that with RAII and allocators. In fact, here's a screenshot where I use RAII to store and free the buffer of an allocator, which containers can use RAII to allocate from. Below blue line is custom deleter, fired off by RAII.pic.twitter.com/Dpv3tgBPic

      2 replies 0 retweets 3 likes
    6. Casey Muratori‏ @cmuratori Jul 5
      Replying to @scottmichaud @TylerGlaiel

      Sure - but then the entire RAII code is useless. This is the point. RAII doesn't have any purpose. If you were using it, you should have used an arena, and if you used an arena, you didn't need any RAII.

      1 reply 0 retweets 5 likes
      Casey Muratori‏ @cmuratori Jul 5
      Replying to @cmuratori @scottmichaud @TylerGlaiel

      (Separately, that code you posted is still slow and bad, right, because the point of an arena is you don't free things individually, you free them in bulk. But that's a separate performance issue.)

      1:25 PM - 5 Jul 2021
      • 4 Likes
      • Ivan Braidi C0rneli0delr4nch0
      2 replies 0 retweets 4 likes
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        2. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
          Replying to @TylerGlaiel @cmuratori @scottmichaud

          also the idea of a custom deleter embedded in a unique_ptr seems fucking crazy to me idk custom allocators are a huge pain in c++ anyway and I only recently started adding them in a couple places

          2 replies 0 retweets 1 like
        3. Show replies
        1. Scott Michaud‏ @scottmichaud Jul 5
          Replying to @cmuratori @TylerGlaiel

          Nope. It was fine. "Free things individually" would be "a whole container full of things".

          0 replies 0 retweets 0 likes
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        2. Gideon Ung‏ @Gidcheeen Jul 6
          Replying to @cmuratori @scottmichaud @TylerGlaiel

          I feel like both the RAII and anti RAII talk past each other. You will have to do resource cleanup. You will have to deallocate even your pools and you will have to close file handles. Since all Raii does is guarantee the cleanup everything @cmuratori is talking about can be done

          1 reply 0 retweets 1 like
        3. Gideon Ung‏ @Gidcheeen Jul 6
          Replying to @Gidcheeen @cmuratori and

          Can be done with or without it. But RAII also isn't the only approach for this to be automated. Especially they way it deals with ownership etc. There is a great video from @contextfreeinfo That talks about many different approaches to it.https://youtu.be/hjeOZN7YGng 

          1 reply 0 retweets 2 likes
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