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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe 31 Jan 2018
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      Replying to @Augustsson

      This looks like an interesting rabbit hole to go down for a bit :-)

      1 reply 0 retweets 0 likes
    2. Boltzmann Brain Think Tank‏ @PLT_cheater 31 Jan 2018
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      Replying to @sigfpe @Augustsson

      AVX-512 will also easily throttle your cpu clock. So uh, maybe not the best idea in an inner loop, so check it doesn't.

      1 reply 0 retweets 1 like
    3. D ␣ a ␣ n ␣ P ␣ i ␣ p ␣ o ␣ n ␣ i‏ @sigfpe 31 Jan 2018
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      Replying to @PLT_cheater @Augustsson

      I usually forget about power so that's interesting!

      1 reply 0 retweets 0 likes
    4. Boltzmann Brain Think Tank‏ @PLT_cheater 31 Jan 2018
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      Replying to @sigfpe @Augustsson

      My guess is it's less about power and more about having to reconfigure parts of the pipeline, or uh, something like that. Basically part of the cpu is io bound because an earlier part is cpu bound. Solution: clock down everything except the lagging part. (My guess)

      1 reply 0 retweets 0 likes
    5. Boltzmann Brain Think Tank‏ @PLT_cheater 31 Jan 2018
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      Replying to @PLT_cheater @sigfpe @Augustsson

      This article talks about avx slowdowns: https://blog.cloudflare.com/on-the-dangers-of-intels-frequency-scaling/ …

      1 reply 0 retweets 0 likes
    6. Boltzmann Brain Think Tank‏ @PLT_cheater 31 Jan 2018
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      Replying to @PLT_cheater @sigfpe @Augustsson

      I wonder if @johnmdanskin, @jangray, @TimSweeneyEpic, or @ID_AA_Carmack have insight as to why AVX induces freq scaling. I would love to know what is behind this. This CERN pdf points to power limits, but it too seems to be a guess rather than knowledge. https://indico.cern.ch/event/327306/contributions/760669/attachments/635800/875267/HaswellConundrum.pdf …

      2 replies 0 retweets 0 likes
    7. Boltzmann Brain Think Tank‏ @PLT_cheater 31 Jan 2018
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      Replying to @PLT_cheater @sigfpe and

      (Wondering if any of you know (of) each other - @sigfpe has done some really good work in 3D graphics)

      1 reply 0 retweets 0 likes
    8. Tim Sweeney‏ @TimSweeneyEpic 31 Jan 2018
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      Replying to @PLT_cheater @sigfpe and

      I think AVX512 downclocking is a temporary artifact that can be improved in future architectures with finer thermal management granularity in time and space.

      2 replies 0 retweets 1 like
    9. Tim Sweeney‏ @TimSweeneyEpic 31 Jan 2018
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      Replying to @TimSweeneyEpic @PLT_cheater and

      I’d expect keeping it running at full capacity for a long time would necessarily cause thermal limiting. However, occasional burst use ought not slow down the chip for a much longer duration than it’s used. Overall I’m very happy to have AVX512 as a step towards convergence.

      1 reply 0 retweets 0 likes
    10. Boltzmann Brain Think Tank‏ @PLT_cheater 31 Jan 2018
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      Replying to @TimSweeneyEpic @sigfpe and

      Sorry, what's convergence?

      1 reply 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic 31 Jan 2018
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      Replying to @PLT_cheater @sigfpe and

      CPU=GPU through many cores and wide vector units.

      1:31 PM - 31 Jan 2018
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      • Boltzmann Brain Think Tank
      0 replies 0 retweets 1 like

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