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raphlinus's profile
Raph Levien
Raph Levien
Raph Levien
@raphlinus

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Raph Levien

@raphlinus

Rust. Fonts. Graphics. Quaker. Independent. he/him

Berkeley, CA
levien.com
Joined May 2009

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    Raph Levien‏ @raphlinus 9 Apr 2019
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    I'm doing perfect hashing for Unicode lookups. Perfect hashing only requires "Good Enough" hash functions. Does anybody know really fast u32->u32 hash-like functions? So far I've got (x * a) ^ (x * b), which seems pretty good.

    7:57 AM - 9 Apr 2019
    • 19 Likes
    • Benjamin Elder λndres Mariscal Esteban K – 🦀⚙️@home CJ Burkey :: UNFVRE Aria Minaei caemor Behnam Esfahbod 🦊 Kan-Ru Chen
    8 replies 0 retweets 19 likes
      1. Raph Levien‏ @raphlinus 9 Apr 2019
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        For the curious, I didn't find anything better than what I first posted, and the results are inhttps://github.com/unicode-rs/unicode-normalization/pull/37 …

        0 replies 0 retweets 10 likes
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      2. Manish‏ @ManishEarth 9 Apr 2019
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        Replying to @raphlinus

        Maybe check out what Rust's phf_map uses?

        1 reply 0 retweets 1 like
      3. Raph Levien‏ @raphlinus 9 Apr 2019
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        Replying to @ManishEarth

        phf_map uses siphash13, which I haven't benchmarked yet but am confident will be a lot slower than what I'm doing now.

        1 reply 0 retweets 2 likes
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      2. λndres Mariscal‏ @SerialDev 9 Apr 2019
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        Replying to @raphlinus

        would this be a suitable use case for https://mollyrocket.com/meowhash  ?

        1 reply 0 retweets 5 likes
      3. Raph Levien‏ @raphlinus 9 Apr 2019
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        Replying to @SerialDev

        That's exactly the kind of thing I was hoping to hear about, thanks for the pointer. I'll look into it.

        0 replies 0 retweets 1 like
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      2. Marcus‏ @marcusklaas 9 Apr 2019
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        Replying to @raphlinus

        how do u choose a and b

        2 replies 0 retweets 1 like
      3. Raph Levien‏ @raphlinus 9 Apr 2019
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        Replying to @marcusklaas

        I have a as the golden mean (in fractional form) and b as 0x31415926 (yes, I know it doesn't make sense).

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. Bram Cohen‏Verified account @bramcohen 9 Apr 2019
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        Replying to @raphlinus

        If it's unkeyed you can split your value into two 16-bit words X and Y and do ((X+1)*(Y+1)%(2^16+1))-1 for a 16-bit output. Not sure about the other 16 bits

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      1. caemor‏ @ccaemor 9 Apr 2019
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        Replying to @raphlinus

        https://github.com/flier/rust-t1ha  includes most of the fast rust hashing functions in its bench if you need a comparison

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      2. 6d65‏ @6D65 9 Apr 2019
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        Replying to @raphlinus

        Fxhash sounds interesting https://github.com/Amanieu/hashbrown/blob/master/src/fx.rs …

        1 reply 0 retweets 0 likes
      3. 6d65‏ @6D65 9 Apr 2019
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        Replying to @6D65 @raphlinus

        *looks, there is also this one https://docs.rs/seahash/3.0.6/seahash/ …

        0 replies 0 retweets 0 likes
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