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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. Jacob Christian Munch-Andersen‏ @NoHatCoder 28 Mar 2020

      Beginning to grok how to benchmark code running on an out-of-order CPU. For most code there is a critical dependency path of instructions that block each other. Any instruction not on that path may have zero impact on measured performance. However, if too many instructions not on

      1 reply 0 retweets 0 likes
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    2. Jacob Christian Munch-Andersen‏ @NoHatCoder 28 Mar 2020

      the critical path are queued up together, they will fill up the instruction queue, and the CPU can't continue running the instructions on the critical path until they are cleared. So telling what instructions block the critical path is non-trivial.

      1 reply 0 retweets 0 likes
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      Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @NoHatCoder

      MCA is getting not terrible, and can be run from GodBolt now:https://godbolt.org/z/jS4uHd 

      4:48 PM - 28 Mar 2020
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        2. Jacob Christian Munch-Andersen‏ @NoHatCoder 29 Mar 2020
          Replying to @cmuratori

          Interesting, but seems to have a lot of shortcomings. It doesn't really do branches? Seems like it just assumes that every instruction is going to run once.

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 29 Mar 2020
          Replying to @NoHatCoder

          This and IACA are only for analyzing loops. So generally you put markers after the { and after the } of a loop and then it assumes that the thing will run forever, and show you that pipeline. They usually assume you ain't doing conditionals, I think.

          1 reply 0 retweets 0 likes
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        1. Jacob Christian Munch-Andersen‏ @NoHatCoder 29 Mar 2020
          Replying to @cmuratori

          Anyway, after you told me about the xxh collision tester I figured that such a program could run on a normal PC, if only ... And two weeks later I'm messing with fast inverse 5th root and libdivide in order to get the runtime down.

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