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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. Neil Henning‏ @sheredom Jul 14

      Neil Henning Retweeted Casey Muratori

      Anyone know how this squares with thread affinity? Last talks I seen by CPU IHVs said 'never do thread affinity!' -> but there is a whole class of thread-sharing algorithms that'd really benefit from only being on neighbouring cores!https://twitter.com/cmuratori/status/1415376457036009475 …

      Neil Henning added,

      Casey Muratori @cmuratori
      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
      8 replies 0 retweets 23 likes
      Casey Muratori‏ @cmuratori Jul 14
      Replying to @sheredom

      I assume the reason they say that is because people just kind of set it and forget about it, which doesn't work across varied chip designs. In order for affinity to work better than the OS's automatic assignment, you'd have to query the OS CPU/memory layout and use that.

      1:52 PM - 14 Jul 2021
      • 1 Retweet
      • 7 Likes
      • Ray opdroid1234 Justin🚶‍♂️🔥 Allan J "naturally, your horse won" Murphy Neil Henning
      1 reply 1 retweet 7 likes
        1. New conversation
        2. Bruce Dawson‏ @BruceDawson0xB Jul 14
          Replying to @cmuratori @sheredom

          Even if you set affinity perfectly for your application you run into trouble as soon as there is other software sharing the machine. In your quest for slightly increased performance you could easily cause priority inversions that cause user-visible hangs. Let the OS handle it.

          2 replies 0 retweets 11 likes
        3. Bruce Dawson‏ @BruceDawson0xB Jul 14
          Replying to @BruceDawson0xB @cmuratori @sheredom

          And, critically, if communication time between threads is harming performance then focus on reducing how much you communicate. That will generally give larger benefits than fussing about with affinity

          0 replies 0 retweets 6 likes
        4. End of conversation

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