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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Andrey Upadyshev‏ @oliora 24 Mar 2019

      @cmuratori strangely, benchmark of mum hash https://github.com/vnmakarov/mum-hash/blob/master/README.md … shows that Meow Hash beats other hashes only for very long input

      2 replies 0 retweets 0 likes
      Show this thread
    2. Casey Muratori‏ @cmuratori 24 Mar 2019
      Replying to @oliora

      I'd be interested to see the benchmark. Also, we _do not_ require aligned inputs, but they say we do, so maybe they are not really using Meow Hash?

      1 reply 0 retweets 0 likes
    3. Casey Muratori‏ @cmuratori 24 Mar 2019
      Replying to @cmuratori @oliora

      Either way, I'd never heard of "mum hash", but now that I have, I'll add it to our benchmark and we can see how it actually performs under controlled conditions.

      1 reply 0 retweets 0 likes
    4. Casey Muratori‏ @cmuratori 24 Mar 2019
      Replying to @cmuratori @oliora

      I went ahead and benchmarked it. It is slower than us on all input sizes. It is also slower than other relatively fast hashes at small sizes, such as t1ha and xxhash3, although it may be higher quality than those, I don't know... more on that later :)

      2 replies 0 retweets 0 likes
    5. Andrey Upadyshev‏ @oliora 24 Mar 2019
      Replying to @cmuratori

      They might show less throughput in throughput tests but has lower latency in intermixed load.

      1 reply 0 retweets 0 likes
    6. Casey Muratori‏ @cmuratori 24 Mar 2019
      Replying to @oliora

      I've been talking latency numbers this entire time, not throughput. We actually don't do any throughput testing - all our measurements include a cpuid flush.

      1 reply 0 retweets 0 likes
    7. Andrey Upadyshev‏ @oliora 25 Mar 2019
      Replying to @cmuratori

      Run Meow Hash with ASAN enabled and it reads out of buffer if buffer is small enough (mine is 6 bytes) at https://github.com/cmuratori/meow_hash/blame/master/meow_hash.h#L218 …

      1 reply 0 retweets 0 likes
    8. Casey Muratori‏ @cmuratori 25 Mar 2019
      Replying to @oliora

      Nope, that is ASAN being ASAN. It doesn't know the difference between a protected read and an unprotected read.

      1 reply 0 retweets 0 likes
    9. Andrey Upadyshev‏ @oliora 25 Mar 2019
      Replying to @cmuratori

      It’s reading after the buffer even if it is masked then. In our code we don’t have tolerance for such things.

      1 reply 0 retweets 0 likes
    10. Mārtiņš Možeiko‏ @mmozeiko 25 Mar 2019
      Replying to @oliora @cmuratori

      You an always suppress false positives: https://clang.llvm.org/docs/AddressSanitizer.html#issue-suppression …

      2 replies 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 25 Mar 2019
      Replying to @mmozeiko @oliora

      I have considered it, but I've assumed then people will complain that you're turning it off :/

      12:46 PM - 25 Mar 2019
      0 replies 0 retweets 0 likes

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