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The current crc64 algorithm is a variant of the Redis implementation. Change it to a variant of the Adler implementation as described at https://matt.sh/redis-crcspeed Test program at https://github.com/PeeJay/crc64-compare Filesize: 1.1G Asking crc64-redis to sum "/media/peejay/BTRFS/1/ubuntu-14.04.5-desktop-amd64.iso"... Asking crc64-adler to sum "/media/peejay/BTRFS/1/ubuntu-14.04.5-desktop-amd64.iso"... Redis CRC-64: f971f9ac6c8ba458 Adler CRC-64: f971f9ac6c8ba458 Adler throughput: 1659.913308 MB/s Redis throughput: 437.284661 MB/s Adler is 3.79x faster than Redis Signed-off-by: Paul Jones <paul@pauljones.id.au>