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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 Jul 14

    This is a great diagram from Anandtech (https://anandtech.com/show/16805/amd-threadripper-pro-review-an-upgrade-over-regular-threadripper/10 …). It uses color to show the relative cost of communicating between any two cores of a 64-core Threadripper. The physical layout of chips is becoming increasingly important to performance-oriented programming!pic.twitter.com/Urh1i0xHzs

    11:23 AM - 14 Jul 2021
    • 121 Retweets
    • 600 Likes
    • Far-Left Strongbad Jesse van Leeuwen Leonardo Silva kanzie Kyle Hailey Johnny Thompson James Scott-Brown Nick Albright DukeUnreal Works on a new content, peace and FPS~!
    17 replies 121 retweets 600 likes
      1. New conversation
      2. Tyler Glaiel‏Verified account @TylerGlaiel Jul 14
        Replying to @cmuratori

        I mean at 64 cores if your threads require communicating between each other enough for this to be an issue you probably didn't multithread the right way anyway

        4 replies 0 retweets 21 likes
      3. Casey Muratori‏ @cmuratori Jul 14
        Replying to @TylerGlaiel

        That assumes that you don't have any difficult problems in the threading, though, which is often true for games but not necessarily always true for other things (compilers, databases, etc.)

        2 replies 1 retweet 16 likes
      4. Show replies
      1. Zeozen  ☠️‏ @ZeozenB Jul 14
        Replying to @cmuratori

        this kind of stuff is really cool and I appreciate everyone thinking about these things!

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. RKD 🇷🇺 🇮🇱‏ @RatKnightDev Jul 14
        Replying to @cmuratori

        According to the link the numbers are in nanoseconds. 100 nanoseconds is 0.0001 milliseconds. So my question is, in what context would this level of latency be a practical concern, and how could it be addressed?

        2 replies 0 retweets 0 likes
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      2. pentasori‏ @pentasori Jul 14
        Replying to @cmuratori

        Are there even ways to actually take advantage of these kinds of layouts in high-level languages (C#, Java)?

        1 reply 0 retweets 0 likes
      3. Jack Pappas‏ @JKPappas Jul 15
        Replying to @pentasori @cmuratori

        Yes, you can set thread affinity (to specific core(s)) for managed-language threads just as for native threads.

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. Morgan‏ @rhoark Jul 14
        Replying to @cmuratori @Jonathan_Blow

        Hypercube ipc topology is back?

        0 replies 0 retweets 0 likes
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      1. Jason Olson‏ @jolson88 Jul 14
        Replying to @cmuratori

        Wow, some things I wouldn't have imagined. I would have thought near-core communication would always be fairly consistent but core-31 communicating to core-32 takes a big hit. Fascinating seeing the 8-core groupings too.

        0 replies 0 retweets 0 likes
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      2. Aaron Fritz‏ @aaron_fritz1 Jul 14
        Replying to @cmuratori

        I wonder how to implement this in a CPU-independent way: bool IsPreferredPair(ThreadID a, ThreadID b); Would you need a CPUID function to see if cores are in separate groups? Maybe this would always return true on ARM unless the next Mac Pro has this distance issue too.

        1 reply 0 retweets 0 likes
      3. Casey Muratori‏ @cmuratori Jul 14
        Replying to @aaron_fritz1

        There are various attempts on OSes already.https://docs.microsoft.com/en-us/windows/win32/procthread/multiple-processors …

        1 reply 0 retweets 1 like
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