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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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    Casey Muratori‏ @cmuratori Oct 19

    Part two of the refterm live stream is now available on YouTube - "Slow Code Isolation":https://youtu.be/lStYLF6Us_Q 

    3:42 PM - 19 Oct 2021
    • 6 Retweets
    • 104 Likes
    • TheRoboZ (Andrea Baldiraghi) Anton Lee أمين صايغ | Ameen Sayegh Pau Fernández Rytis Ivan Braidi Nicholas Gilmet Sampath AMUSEMENT VIS
    7 replies 6 retweets 104 likes
      1. New conversation
      2. Michael Spangler‏ @failbottt Oct 19
        Replying to @cmuratori

        Thanks for introducing that idea of "cache the answers and never call the slow code". In hindsight, it's an obvious concept, but I hadn't ever thought about it.

        1 reply 0 retweets 6 likes
      3. Casey Muratori‏ @cmuratori Oct 19
        Replying to @failbottt

        It's what caches are for! :)

        1 reply 0 retweets 0 likes
      4. Show replies
      1. It went south from there‏ @rackytacky Oct 19
        Replying to @cmuratori

        "When it's you and Microsoft, you can just assume it's the bad code over here":)) Srs though, ppl use layered archs without realizing "slow" is a multiplier. If using a lib is "only 20% slower" but that is using another lib/API, then repeat 6 layers, end result is 7X slower!

        0 replies 0 retweets 3 likes
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      1. Jeremiah Goerdt‏ @CaptainKraft Oct 19
        Replying to @cmuratori

        You really know how to "leave em wanting more"

        0 replies 0 retweets 0 likes
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      1. Hasen Judy حسن الجودي‏ @hasen_judy Oct 19
        Replying to @cmuratori

        It should be obvious to anyone, but the point about processing the input buffer potentially double or trippling (or worse) your run time almost never occurred to me. Probably the single best argument against Go's i/o interface as it seems to encourage a lot of copying

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. Οεσε Παπα‏ @papavo Oct 20
        Replying to @cmuratori

        xterm and especielly xlib(and the whole X protocol) suffer the same flaws you describe here

        1 reply 0 retweets 0 likes
      3. Casey Muratori‏ @cmuratori Oct 20
        Replying to @papavo

        Yes, and in fact you can measure the very slow performance of many terminals using the benchmark I wrote for this:https://github.com/cmuratori/termbench …

        1 reply 0 retweets 1 like
      4. Show replies
      1. New conversation
      2. Jamie Johnson‏ @aegisofpaean Oct 20
        Replying to @cmuratori

        Shipped the "roulette circular buffer" implementation in Xbox Fitness for Xbox One, 2012-13, for streaming video system. Backup code path was present as well, never triggered. ~100us / frame decode at the time. Nice to hear robust solution was added to kernel.

        1 reply 0 retweets 0 likes
      3. Casey Muratori‏ @cmuratori Oct 20
        Replying to @aegisofpaean

        It's been one of those things that has been frustrating, because it is a very powerful capability of the CPU, but we have not had reliable access to it :( So it was very exciting when it was embraced in the Windows Kernel. It means from Windows 10 on it's all fair game!

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Benjamin Pedersen‏ @Benjipede Oct 20
        Replying to @cmuratori

        [1/2] Dumb question: Is the buffer locked? As far as I can see, a circular buffer can be completely thread-safe, while only locking writes during reads (or writes if there are multiple writers) if you can begin a write and bump the tail as an atomic action.

        2 replies 0 retweets 0 likes
      3. Show replies

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