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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. Hector Martin‏ @marcan42 7 Jun 2015
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      Trying to optimize my OpenCL code for GPU. My "GPU-optimized" version runs a bit faster on CPU and much slower on GPU. Fail.

      1 reply 1 retweet 4 likes
    2. 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
    3. 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
    4. 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
    5. 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
      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 :-)

      8:31 AM - 7 Jun 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        1. 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
        2. 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
        3. Show replies

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