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TheKanter's profile
David Kanter
David Kanter
David Kanter
@TheKanter

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David Kanter

@TheKanter

San Francisco
realworldtech.com
Joined November 2009

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    1. Richard Mitton‏ @grumpygiant Aug 20

      Any good examples of historical rendering dead-ends, e.g. Ecstatica’s ellipsoid technology?

      22 replies 9 retweets 28 likes
    2. Tom Forsyth‏ @tom_forsyth Aug 20
      Replying to @grumpygiant

      Raytracing.

      5 replies 0 retweets 42 likes
    3. Nicolas Guillemot‏ @nlguillemot Aug 20
      Replying to @tom_forsyth @grumpygiant

      🔥🔥🔥

      1 reply 0 retweets 0 likes
    4. Marco Salvi‏ @marcosalvi Aug 20
      Replying to @nlguillemot @tom_forsyth @grumpygiant

      I bet Tom is hard at work on Intel's future RT architecture.

      1 reply 0 retweets 0 likes
    5. c0de517e/AngeloPesce‏ @kenpex Aug 20
      Replying to @marcosalvi @nlguillemot and

      Lrb did rtrt before it was cool.

      2 replies 0 retweets 0 likes
    6. Marco Salvi‏ @marcosalvi Aug 20
      Replying to @kenpex @nlguillemot and

      Lrb did s**t.

      2 replies 0 retweets 4 likes
    7. Richard Mitton‏ @grumpygiant Aug 20
      Replying to @marcosalvi @kenpex and

      Strongly disagree with what's going on here. Larrabee could have been awesome if Intel hadn't bollocksed it up. Definitely not a rendering dead-end.

      3 replies 0 retweets 1 like
    8. Marco Salvi‏ @marcosalvi Aug 20
      Replying to @grumpygiant @kenpex and

      That's just a fairy tale. I worked on Lrb and it never stood a chance. The vision was noble, but the execution was terrible.

      1 reply 0 retweets 2 likes
    9. Tom Forsyth‏ @tom_forsyth Aug 20
      Replying to @marcosalvi @grumpygiant and

      For someone who hates it so much, you do keep banging on about it.

      1 reply 0 retweets 0 likes
    10. Marco Salvi‏ @marcosalvi Aug 20
      Replying to @tom_forsyth @grumpygiant and

      It must be the byproduct of certain revisionism.

      1 reply 0 retweets 0 likes
      David Kanter‏ @TheKanter Aug 20
      Replying to @marcosalvi @tom_forsyth and

      <Grabs a bag of popcorn>

      9:28 PM - 20 Aug 2018
      • 9 Likes
      • jeronymod Anders Lindqvist amit sheokand Dietmar Suoch c0de517e/AngeloPesce Branislav Grujic Dayman Benjamin Ahlbrand dylan522p
      1 reply 0 retweets 9 likes
        1. New conversation
        2. c0de517e/AngeloPesce‏ @kenpex Aug 20
          Replying to @TheKanter @marcosalvi and

          I haven't worked on LRB but I remember at the time thinking there was no way for it to succeed as a discrete GPU. That said I'm grumpy and skeptical about most things nowadays. Also usually right, but that's easy, most stuff fails.

          2 replies 0 retweets 0 likes
        3. Marco Salvi‏ @marcosalvi Aug 20
          Replying to @kenpex @TheKanter and

          Funnily enough the architecture of modern GPUs is not that distant from that original grand vision.

          1 reply 0 retweets 2 likes
        4. Tom Forsyth‏ @tom_forsyth Aug 21
          Replying to @marcosalvi @kenpex and

          Certainly LRBNI/AVX512 turned out spookily similar to GCN ISA. Some good "convergent evolution" going on. The micro-architectures are quite different though.

          1 reply 1 retweet 4 likes
        5. c0de517e/AngeloPesce‏ @kenpex Aug 21
          Replying to @tom_forsyth @marcosalvi and

          I mean at a glance, I guess you are right but it’s not that these GPU concepts didn’t exist before lrb or gcn. Unless you are talking about some more specific things, you are too vague.

          1 reply 0 retweets 0 likes
        6. c0de517e/AngeloPesce‏ @kenpex Aug 21
          Replying to @kenpex @tom_forsyth and

          But I mean even just thinking of the isa, and not the uarch, there are several key differences. I’d say I see more differences than similarities but I am very curious to know what you mean

          2 replies 0 retweets 0 likes
        7. Tom Forsyth‏ @tom_forsyth Aug 21
          Replying to @kenpex @marcosalvi and

          ISA the same: predication, flow control, vector/scalar split (regs, pipeline and ISA). GCN had more free negate/abs/scale options. Broad concept of taking to TexUnits similar - all state explicit packed into request, rather than being implicit inside TXU.

          2 replies 1 retweet 4 likes
        8. Sebastian Aaltonen‏ @SebAaltonen Aug 21
          Replying to @tom_forsyth @kenpex and

          I have been always wondering whether GCN has 64 wide waves because it needs to send resource descriptor inside each sample/load instruction. Wider wave makes this additional data less significant (as UVs = 64 bits per lane = 4096 bits in total). 256 bit desc = 6.25%.

          1 reply 0 retweets 3 likes
        9. Tom Forsyth‏ @tom_forsyth Aug 21
          Replying to @SebAaltonen @kenpex and

          SIMD width choice is always about efficiency (wider) vs occupancy (narrower). I suspect there's LOTS of places that went into the decision. Intel's GPUs hedge their bets and support multiple SIMD widths.

          3 replies 0 retweets 6 likes
        10. 6 more replies

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