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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. Casey Muratori‏ @cmuratori Aug 19

      Apparently, Intel's next generation desktop processors do not have AVX-512 support. https://www.anandtech.com/show/16881/a-deep-dive-into-intels-alder-lake-microarchitectures/5 …

      10 replies 12 retweets 83 likes
    2. Swarnim Arun‏ @swarnimarun Aug 20
      Replying to @cmuratori

      Wasn't AVX512 already quite useless in consumer hardware because of lack of support on all other sides of the aisle atm. Maybe Intel specific binaries could use it otherwise... hmm... They did port over VNNI to AVX2 too. AVX-VNNI is the official name iirc.https://www.phoronix.com/scan.php?page=news_item&px=GCC-11-AVX-VNNI …

      2 replies 0 retweets 1 like
    3. Matt Bentley‏ @xolvenz Aug 20
      Replying to @swarnimarun @cmuratori

      AVX-512 supports Genuinely-Efficient scatter-gather SIMD operations ie. when the items you're wanting to process in parallel are not already contiguous in memory. There's assloads of application for that, ie. for any container which isn't a straight array or a vector.

      2 replies 0 retweets 1 like
    4. Ivica Bogosavljevic‏ @i_bogosavljevic Aug 20
      Replying to @xolvenz @swarnimarun @cmuratori

      Why is the same thing not supported with AVX? And how do they achieve the efficiency, do they skip loading the full cache lines?

      1 reply 0 retweets 0 likes
    5. Matt Bentley‏ @xolvenz Aug 21
      Replying to @i_bogosavljevic @swarnimarun @cmuratori

      Don't know. It's supported in AVX2 I believe, but the implementation is apparently not much better than scattering/gathering manually into an array. AVX512 is AFAIK the only instruction set so far that does it efficiently. Would be useful for processing colony/hive/list elements.

      2 replies 0 retweets 0 likes
    6. Swarnim Arun‏ @swarnimarun Aug 22
      Replying to @xolvenz @i_bogosavljevic @cmuratori

      Very interesting, personally I thought AVX2 lacked support for scatter instructions aka Mask Registers. Is there a reference about this? I couldn't find it on a quick Google search. Also afaik gather in both AVX2 and AVX512 is similar. Though I agree Mask Registers sure are nice.

      1 reply 0 retweets 0 likes
    7. Casey Muratori‏ @cmuratori Aug 22
      Replying to @swarnimarun @xolvenz @i_bogosavljevic

      Mask registers and scatter instructions are different things. AVX2 supports masked scatter/gather, but not mask registers (you can mask using another 256-bit register). AVX-512 has mask _registers_, which are special 64-bit registers that only hold masks.

      1 reply 0 retweets 0 likes
    8. Casey Muratori‏ @cmuratori Aug 22
      Replying to @cmuratori @swarnimarun and

      I have only recently had the opportunity to deploy on AVX-2, so I don't have a strong opinion about scatter/gather on it. But glancing at the tables, I can't say I know why AVX-512 would be any better than AVX-2:pic.twitter.com/5VCGefUMis

      4 replies 0 retweets 0 likes
      Casey Muratori‏ @cmuratori Aug 22
      Replying to @cmuratori @swarnimarun and

      I would be interested to hear from someone who has used both.

      11:33 AM - 22 Aug 2021
      0 replies 0 retweets 0 likes

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