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lemire's profile
Daniel Lemire
Daniel Lemire
Daniel Lemire
@lemire

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Daniel Lemire

@lemire

Computer science professor at the University of Quebec (TELUQ), open-source hacker, and long-time blogger. 👨‍💻

Montreal, Canada  🇨🇦
lemire.me/en/
Joined November 2007

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    Daniel Lemire‏ @lemire 19 Dec 2019
    • Report Tweet

    Xor Filters: Faster and Smaller Than Bloom Filtershttps://lemire.me/blog/2019/12/19/xor-filters-faster-and-smaller-than-bloom-filters/ …

    3:52 PM - 19 Dec 2019
    • 236 Retweets
    • 688 Likes
    • ... Knarf 𝓐𝓵𝓫𝓮𝓻𝓽 🌵🍺 geeknix Makis Dim Sandor Szücs Mark Kriegsman Konrāds Klints Sesha S
    18 replies 236 retweets 688 likes
      1. New conversation
      2. Jonah H. Harris‏ @jonahharris 20 Dec 2019
        • Report Tweet
        Replying to @lemire

        This article felt like a bait-and-switch. It sounded interesting until the very end, when finding out it’s immutable-only and, as such, not an online-capable algorithm. That’s a pretty big caveat and a huge difference when basing the article on bloom and cuckoo comparisons. :(

        1 reply 0 retweets 1 like
      3. Daniel Lemire‏ @lemire 20 Dec 2019
        • Report Tweet
        Replying to @jonahharris

        Neither Bloom nor cuckoo filters are online algorithms. It is all fixed capacities.

        1 reply 0 retweets 2 likes
      4. 6 more replies
      1. New conversation
      2. Todd Lipcon‏ @tlipcon 19 Dec 2019
        • Report Tweet
        Replying to @lemire

        Any comparison to vacuum filter (vldb19?)

        1 reply 0 retweets 5 likes
      3. Daniel Lemire‏ @lemire 20 Dec 2019
        • Report Tweet
        Replying to @tlipcon

        Xor filters are going to be faster, smaller; the implementation far simpler (~200 lines).

        0 replies 0 retweets 4 likes
      4. End of conversation
      1. New conversation
      2. Loris Cro‏ @croloris 20 Dec 2019
        • Report Tweet
        Replying to @lemire

        CF nerd here, thanks for the paper I'll make sure to read it carefully. In the meantime, two nitpicks: 1. Cuckoo's aren't that hard, I have a <250 LOC implementation that doesn't cut corners.https://github.com/kristoff-it/zig-cuckoofilter …

        2 replies 0 retweets 7 likes
      3. Daniel Lemire‏ @lemire 20 Dec 2019
        • Report Tweet
        Replying to @croloris

        Your implementation is great and quite simple. I don't think I ever wrote that this wasn't possible. I will write however that your implementation of an xor filter would be simpler. At least the query part...

        1 reply 0 retweets 3 likes
      4. 1 more reply
      1. New conversation
      2. Andreas Kipf‏ @andreaskipf 20 Dec 2019
        • Report Tweet
        Replying to @lemire

        Nice implementation! The space savings are impressive. Have you considered comparing against cache-sectorized and register-blocked Bloom filters? http://www.vldb.org/pvldb/vol12/p502-lang.pdf …https://github.com/peterboncz/bloomfilter-bsd …

        1 reply 0 retweets 2 likes
      3. Andreas Kipf‏ @andreaskipf 20 Dec 2019
        • Report Tweet
        Replying to @andreaskipf @lemire

        This repo contains reproducibility instructions:https://github.com/peterboncz/bloomfilter-repro …

        1 reply 0 retweets 1 like
      4. 1 more reply
      1. New conversation
      2. Alexander Nasonov‏ @nasonov 20 Dec 2019
        • Report Tweet
        Replying to @lemire

        When I experimented with random acyclic graphs, murmur was quite bad on some inputs, look at how many tests are commented out: https://github.com/alnsn/rgph/blob/a3b5821d43821a9d9cb4d042a356a48e4bc35885/test/graph.lua#L339 …

        1 reply 0 retweets 1 like
      3. Daniel Lemire‏ @lemire 20 Dec 2019
        • Report Tweet
        Replying to @nasonov

        Murmur is quite good. Are you sure that your implementation is correct?

        1 reply 0 retweets 2 likes
      4. 1 more reply

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