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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Axel Rauschmayer‏ @rauschma 24 Nov 2018
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      AFAICT, there is no good way of pre-allocating a large array in JavaScript. new Array(LEN) creates an array that’s slower due to it being “holey”. Time for Array.create()?

      8 replies 2 retweets 19 likes
    2. Brian Lewis ‏ @bxlewi1 24 Nov 2018
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      Replying to @rauschma

      What if you fill the array after the create? Array(10).fill(0)

      1 reply 0 retweets 1 like
    3. Paul Lewis‏ @aerotwist 24 Nov 2018
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      Replying to @bxlewi1 @rauschma

      Right, that would be my thought too. Ideally a pattern we could make fast (assuming it's slow and causes perf issues... I've not tested)

      2 replies 0 retweets 2 likes
    4. Axel Rauschmayer‏ @rauschma 24 Nov 2018
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      Replying to @aerotwist @bxlewi1

      IINM, that doesn’t help: once an array is holey, you can’t go back (at least on V8).

      3 replies 0 retweets 3 likes
    5. Paul Lewis‏ @aerotwist 24 Nov 2018
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      Replying to @rauschma @bxlewi1

      Paging @mathias and @bmeurer on all this. They may have thoughts :)

      1 reply 0 retweets 1 like
    6. Mathias Bynens‏Verified account @mathias 24 Nov 2018
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      Replying to @aerotwist @rauschma and

      There’s an open @v8js issue to consider marking the .fill()ed array packed in the common case: https://bugs.chromium.org/p/v8/issues/detail?id=6892 …

      1 reply 0 retweets 4 likes
    7. Mathias Bynens‏Verified account @mathias 24 Nov 2018
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      Replying to @mathias @aerotwist and

      If that turns out to be feasible, the “a sufficiently advanced compiler” argument applies, and we don’t need Array.create or any other new language features. 🤞

      1 reply 0 retweets 7 likes
    8. sendilkumarn‏ @sendilkumarn 24 Nov 2018
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      Replying to @mathias @aerotwist and

      It would be very interesting to see how this turns out. 😀

      1 reply 0 retweets 0 likes
    9. Benedikt Meurer‏ @bmeurer 24 Nov 2018
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      Replying to @sendilkumarn @mathias and

      I'm wondering what's the concrete example where "holey arrays" are significantly slower than "packed arrays"?

      3 replies 0 retweets 1 like
    10. Jarda Snajdr‏ @jsnajdr 24 Nov 2018
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      Replying to @bmeurer @sendilkumarn and

      This is the article that says so: https://v8.dev/blog/elements-kinds …. "Operations on packed arrays can be optimized more aggressively." "Operations on holey arrays require additional checks and expensive lookups on the prototype chain." No longer true?

      1 reply 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 24 Nov 2018
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      Replying to @jsnajdr @bmeurer and

      Mathias Bynens Retweeted Mathias Bynens

      Still true. The nuance ishttps://twitter.com/mathias/status/1066410153057038336 …

      Mathias Bynens added,

      Mathias BynensVerified account @mathias
      Replying to @rauschma @bmeurer and 4 others
      Operations on holey arrays can still be optimized — just not as aggressively as for packed arrays.
      11:38 AM - 24 Nov 2018
      • 2 Likes
      • Jarda Snajdr Benedikt Meurer
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Benedikt Meurer‏ @bmeurer 24 Nov 2018
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          Replying to @mathias @jsnajdr and

          Right, there's an additional hole check for holey arrays, sure. But since otherwise we've worked hard to eliminate all the really serious performance cliffs with holey arrays, I'm still wondering if users need to worry about the holeyness of 'new Array(N)' in reality.

          1 reply 0 retweets 4 likes
        3. Stefan Penner‏ @stefanpenner 24 Nov 2018
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          Replying to @bmeurer @mathias and

          Whenever I read holey arrays, the “oh holy night” Christmas choral melody begins to play in the back of my head... I also typical imagine the whole v8 team singing “oh holey array” to the same tune, dressed as Santa and co...

          1 reply 0 retweets 3 likes
        4. 3 more replies

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