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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 4 Apr 2015
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      CERN analyzed performance+power usage for some HPC CPU candidates, with expected results: http://lvalsan.web.cern.ch/lvalsan/processor_benchmarking/presentation/ …pic.twitter.com/336T8pgZR3

      5 replies 16 retweets 17 likes
    2. Hector Martin‏ @marcan42 4 Apr 2015
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      Replying to @FioraAeterna

      @FioraAeterna I never realized that Atom is finally good. I always considered them a bit of a joke, but they actually win at perf/W now? Fun

      3 replies 0 retweets 1 like
    3. Fiora @ 日本語でFF14‏ @FioraAeterna 4 Apr 2015
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      Replying to @marcan42

      @marcan42 the new Atoms are a lot better -- still terrible performance-wise, but at least very low power. Broadwells might be better though

      2 replies 0 retweets 2 likes
    4. Hector Martin‏ @marcan42 4 Apr 2015
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      Replying to @FioraAeterna

      @FioraAeterna My old opinion of Atom was "good if you're TDP-limited or need cheap" - Sandy Bridge used to smoke them at perf/W in its day.

      1 reply 0 retweets 0 likes
    5. Solar Designer‏ @solardiz 4 Apr 2015
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      Replying to @marcan42

      @marcan42 @FioraAeterna I expect that Silvermont will lose to Haswell in perf/W for SIMD-friendly code, though. (bcrypt is scalar.)

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 4 Apr 2015
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      Replying to @solardiz

      @solardiz @FioraAeterna IIRC bcrypt is basically evil random-mem-heavy code (i.e. not optimizable/pipelinable) so I can't say I'm surprised

      6:23 PM - 4 Apr 2015
      2 replies 0 retweets 0 likes
        1. Solar Designer‏ @solardiz 5 Apr 2015
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          Replying to @marcan42

          @marcan42 @FioraAeterna That's almost right, but bcrypt performs 4x parallel S-box lookups, and we interleave 2 or 3 instances for cracking

          0 replies 0 retweets 0 likes
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        1. Solar Designer‏ @solardiz 5 Apr 2015
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          Replying to @marcan42

          @marcan42 @FioraAeterna Oh, I forgot to mention the numbers I tweeted are for bcrypt cracking with optimal interleaving. So pipelinable.

          0 replies 0 retweets 0 likes
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