36 lines
1.6 KiB
Text
36 lines
1.6 KiB
Text
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I recently discovered (thanks to Paul Wise) the [Meow hash][]. The
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TL;DR: is that it's a fast non-crypto hash which might be useful for
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git-annex. Here's their intro, quoted from the website:
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[Meow hash]: https://mollyrocket.com/meowhash
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> The Meow hash is a high-speed hash function named after the character
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> Meow in [Meow the Infinite][]. We developed the hash function at
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> [Molly Rocket][] for use in the asset pipeline of [1935][].
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>
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> Because we have to process hundreds of gigabytes of art assets to build
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> game packages, we wanted a fast, non-cryptographic hash for use in
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> change detection and deduplication. We had been using a cryptographic
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> hash ([SHA-1][]), but it was
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> unnecessarily slowing things down.
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>
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> To our surprise, we found a lack of published, well-optimized,
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> large-data hash functions. Most hash work seems to focus on small input
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> sizes (for things like dictionary lookup) or on cryptographic quality.
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> We wanted the fastest possible hash that would be collision-free in
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> practice (like SHA-1 was), and we didn't need any cryptograhic security.
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>
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> We ended up creating Meow to fill this niche.
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[1935]: https://molly1935.com/
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[Molly Rocket]: https://mollyrocket.com/
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[Meow the Infinite]: https://meowtheinfinite.com/
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[SHA-1]: https://en.m.wikipedia.org/wiki/SHA-1
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I don't an immediate use case for this right now, but I think it could
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be useful to speed up checks on larger files. The license is a
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*little* weird but seems close enough to a BSD to be acceptable.
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I know it might sound like a conflict of interest, but I *swear* I am
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not bringing this up only as a oblique feline reference. ;) -- [[anarcat]]
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