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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @marcan42

      @marcan42 *earperk* optimizing GPU code? do tell!

      1 reply 0 retweets 1 like
    2. Hector Martin‏ @marcan42 7 Jun 2015
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      Replying to @FioraAeterna

      @FioraAeterna https://github.com/marcan/cl-waifu2x … OpenCL is hard and Nvidia makes it harder by not having a profiler...

      1 reply 0 retweets 1 like
    3. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @marcan42

      @marcan42 stuff like this total_pixels = bh * bw * ((h+bh-pad-1)//(bh-pad)) * ((w+bw-pad-1)//(bw-pad)) [...]

      1 reply 0 retweets 1 like
    4. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @FioraAeterna

      @marcan42 and the variable trip count loops makes me as a compiler person REALLY wish those could be constants...

      2 replies 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 7 Jun 2015
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      Replying to @FioraAeterna

      @FioraAeterna Thankfully none of that is performance-sensitive code, the OpenCL kernel is all that matters :-)

      1 reply 0 retweets 0 likes
    6. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @marcan42

      @marcan42 OH, I'm an idiot, I completely missed the kernel bit

      1 reply 0 retweets 0 likes
    7. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @FioraAeterna

      @marcan42 oh gods that is a horrifying ratio of memory reads to arithmetic

      1 reply 0 retweets 2 likes
    8. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @FioraAeterna

      @marcan42 I look at https://github.com/marcan/cl-waifu2x/commit/89176cc52b99ea7bdb0b9b71589379f3d751fe95#diff-d2a065162d2048b6908eee284e028eafR24 … and recoil in horror

      1 reply 0 retweets 2 likes
    9. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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      Replying to @FioraAeterna

      @marcan42 are those at least in local memory, or are these all global reads... *sob*

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 7 Jun 2015
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      Replying to @FioraAeterna

      @FioraAeterna Global... I've been trying to use local memory to reuse data but everything I try makes it *slower*. *sob*

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 7 Jun 2015
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      @FioraAeterna This is the horrible thing it's trying to compute (well, the worst step). 128 ins, 128 outs, full mesh.pic.twitter.com/aOpHDYoL0z

      8:42 AM - 7 Jun 2015
      • 2 Likes
      • mr. waddlesplash Fiora @ 日本語でFF14
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        1. Hector Martin‏ @marcan42 7 Jun 2015
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          Replying to @marcan42

          @FioraAeterna The "kernels" are distinct 3x3 convolutions. So there are 128x128 independent 3x3 kernels, for each in,out pair.

          1 reply 0 retweets 0 likes
        2. Fiora @ 日本語でFF14‏ @FioraAeterna 7 Jun 2015
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          Replying to @marcan42

          @marcan42 does this mean there's 128^2 coefficients?

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