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No hash function is perfect, but some are useful.

wyhash and wyrand are the ideal 64-bit hash function and PRNG respectively:

solid: wyhash passed SMHasher, wyrand passed BigCrush, practrand.

portable: 64-bit/32-bit system, big/little endian.

fastest: Efficient on 64-bit machines, especially for short keys.

simplest: In the sense of code size.

salted: We use dynamic secret to avoid intended attack.

wyhash is the default hasher for a hash table of the great Zig, V and Nim language.

Simple Example:

#include  "wyhash.h"
uint64_t _wyp[4];
make_secret(time(NULL),_wyp);
string  s="fcdskhfjs";
uint64_t h=wyhash(s.c_str(),s.size(),0,_wyp);

g++-9 benchmark.cpp t1ha/src/t1ha2.c -o benchmark -Ofast -s -Wall -march=native

/usr/share/dict/words

hash function short hash/us bulk_256B GB/s bulk_64KB GB/s
wyhash_final3 419.63 20.97 25.10
wyhash_final2 204.08 21.12 25.10
wyhash_final1 196.33 15.56 17.92
wyhash_gamma (dangerous) 399.92 19.16 25.80
wyhash_beta 180.51 18.20 17.37
wyhash_alpha 204.50 20.54 25.92
wyhash_v6 (avx2) 164.08 12.08 41.35
wyhash_v5 221.59 15.40 16.78
wyhash_v4 153.03 13.89 16.81
wyhash_v3 191.32 13.55 15.72
wyhash_v2 94.28 11.91 11.22
wyhash_v1 91.66 16.03 18.95
wyhash32 (32 bit) 149.78 5.45 4.89
xxh3_scalar 152.47 8.39 13.05
xxh3_avx2 144.62 9.85 44.82

C# https://github.com/cocowalla/wyhash-dotnet

C++ https://github.com/tommyettinger/waterhash

GO https://github.com/dgryski/go-wyhash

GO https://github.com/orisano/wyhash

GO https://github.com/littleli/go-wyhash16

GO https://github.com/zeebo/wyhash

GO https://github.com/lonewolf3739/wyhash-go

GO https://github.com/zhangyunhao116/wyhash (final version 1)

Java https://github.com/OpenHFT/Zero-Allocation-Hashing

Nim https://github.com/nim-lang/Nim/blob/devel/lib/pure/hashes.nim

Nim https://github.com/jackhftang/wyhash.nim

Nim https://github.com/littleli/nim-wyhash16

Rust https://github.com/eldruin/wyhash-rs

Swift https://github.com/lemire/SwiftWyhash

Swift https://github.com/lemire/SwiftWyhashBenchmark

Swift https://github.com/jeudesprits/PSWyhash

V https://github.com/vlang/v/tree/master/vlib/hash/wyhash (v4)

Zig https://github.com/ManDeJan/zig-wyhash

absl hashmap https://github.com/abseil/abseil-cpp/blob/master/absl/hash/internal/wyhash.cc


I thank these names:

Reini Urban

Dietrich Epp

Joshua Haberman

Tommy Ettinger

Daniel Lemire

Otmar Ertl

cocowalla

leo-yuriev

Diego Barrios Romero

paulie-g

dumblob

Yann Collet

ivte-ms

hyb

James Z.M. Gao

easyaspi314 (Devin)

TheOneric


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