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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton Apr 16
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      Small string optimization (storing small strings inline instead of spilling to the heap) is something I'm pretty meh on. Many years ago I implemented it for all strings and vectors in Rust. The resulting code bloat was unbelievable.

      7 replies 2 retweets 57 likes
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      Patrick Walton‏ @pcwalton Apr 16
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      The power-law distribution of string sizes means that you get a surprising amount of benefit from optimizing the case of zero-length strings and nothing else (which is what Rust does). Happily, zero-length string/vector optimization is basically free.

      12:13 AM - 16 Apr 2020
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      4 replies 0 retweets 44 likes
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        2. Marijn Haverbeke‏ @MarijnJH Apr 16
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          Replying to @pcwalton

          Back when Rust built-in arrays were still variable-length I tried to implement a special case for zero-length arrays, assuming it to be a no-brainer win—and it made things slower. That still kind of informs my expectations around this kind of optimizations.

          2 replies 0 retweets 3 likes
        3. Marijn Haverbeke‏ @MarijnJH Apr 16
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          Replying to @MarijnJH @pcwalton

          I may just have done something stupid, of course. Interesting to hear zero-length vectors are special-cased again.

          1 reply 0 retweets 0 likes
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        2. glandium‏ @MikeHommey Apr 16
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          Replying to @pcwalton

          You'd be surprised by the kind of realloc patterns that can be seen from IIRC Gtk+ when starting Firefox that come from small strings becoming increasingly larger and that would fit for the small string optimization. (at least that was the case 3+ years ago)

          1 reply 0 retweets 2 likes
        3. glandium‏ @MikeHommey Apr 16
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          Replying to @MikeHommey @pcwalton

          That said, while the small string optimization would help them, not doing the "increment this string size step by step" at all would be even better.

          0 replies 0 retweets 3 likes
        4. End of conversation
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        1. 刘雨培‏ @liuyupei951018 Apr 16
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          Replying to @pcwalton

          A silly question: why do string sizes satisfy power-law distribution?

          0 replies 0 retweets 0 likes
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