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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori Jun 6

      Since there was some confusion about how slow the new Windows "Virtual Terminal Sequences" are in cmd.exe (answer: 2fps for a full screen update), I put up a simple benchmarking program you can use for testing: https://github.com/cmuratori/termbench …pic.twitter.com/jc0hsduZkQ

      10 replies 16 retweets 133 likes
      Show this thread
    2. dok‏ @jmsdok Jun 7
      Replying to @cmuratori

      Is this really limited by the sequence parsing ? I've tried running this on st terminal, it is also slow but mostly due to glyphs drawing, not limited by the parsing.

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori Jun 7
      Replying to @jmsdok

      Without actually building and profiling their code (which I'm not going to do, because ostensibly this is Microsoft's job, and people are paid to work on this thing), I can't say for sure. But it seems to be the parser, because if you remove the color codes, it goes much faster.

      12:11 PM - 7 Jun 2021
      • 2 Likes
      • C0rneli0delr4nch0 Ivan Braidi
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori Jun 7
          Replying to @cmuratori @jmsdok

          (In other words, if you just try to draw this many characters all in the same color, so it's 30k of data instead of 600k of data to parse, but still has to draw the same number of glyphs, it runs significantly faster, which definitely implicates the ingress).

          1 reply 0 retweets 2 likes
        3. dok‏ @jmsdok Jun 7
          Replying to @cmuratori

          The parsing could be also tested by moving the cursor for each glyphs. But I think you're right, I've run another test and strtol takes quite a bit of the parsing process. (this is not a window terminal but both uses ANSI escape sequence)pic.twitter.com/XmY7EPvw2a

          callgraph of the main rendering loop of st (simple terminal), 20% of the time is spent in draw() function and 75% in reading and parsing text in ttyread() function. The hot spot in draw() is xdrawline (%20) which does the rendering call. The hot spot in ttyread() are strtol (13%) wcwidth (10%) and utf8encode (6%).
          0 replies 0 retweets 1 like
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