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hooraybuffer's profile
Peter Marshall
Peter Marshall
Peter Marshall
@hooraybuffer

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Peter Marshall

@hooraybuffer

Engineer on @chromedevtools (and occasionally @v8js)

Munich, Bavaria
Joined December 2015

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    1. Peter van der Zee‏ @kuvos 11 Oct 2019
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      • Report NetzDG Violation

      Refactoring with a counts based profiler. Visualizing micro benchmarking. Basically this reduces the number of branches for the hot path from 5 down to 3 `if`s. It eliminates two more inside the `isPsLs()` call so down from 7 to 3. Yay! :)pic.twitter.com/X58yUu85qe

      2 replies 0 retweets 5 likes
    2. Mathias Bynens‏Verified account @mathias 11 Oct 2019
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      Replying to @kuvos

      Have you tried running a trace in the DevTools Performance panel, and then viewing the script in the Sources panel? Execution time per line!

      4 replies 1 retweet 0 likes
    3. Peter van der Zee‏ @kuvos 11 Oct 2019
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      Replying to @mathias

      Just looking at it for shits and giggles. My gripe is that it's sample based. Also, most lines are so micro that even in this particular function (input is all js1ks in one file, many strings) gives me less insight. Except for the fromCharCode vs input[pointer] case, ofcourse.pic.twitter.com/7fjxxqgQ6h

      1 reply 0 retweets 1 like
    4. Peter van der Zee‏ @kuvos 12 Oct 2019
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      Replying to @kuvos @mathias

      Btw, this is also a bit confusing. What exactly does the time indicated on the `do` mean here? It would be helpful if loops showed the collective time spent inside the loop, though. And maybe filters? ("show only lines with time spent above some threshold", and "jump to next")pic.twitter.com/kw2bs7e1Ui

      1 reply 0 retweets 0 likes
      Peter Marshall‏ @hooraybuffer 14 Oct 2019
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      Replying to @kuvos @mathias

      Time spent in `do` is probably time attributable to the loop itself like the back-jump at the end, condition check etc. Maybe that would be better attributed to the line with `while`. Or it's a bug in how we attribute things (e.g. line 426 looks unlikely).

      6:49 AM - 14 Oct 2019
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      • Peter van der Zee
      0 replies 0 retweets 1 like

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