xxHash

Extremely fast non-cryptographic hash algorithm http://www.xxhash.com/

Benchmark

BenchmarkDotNet=v0.10.13, OS=Windows 10 Redstone 3 [1709, Fall Creators Update] (10.0.16299.309)
Intel Core i7-4700MQ CPU 2.40GHz (Haswell), 1 CPU, 8 logical cores and 4 physical cores
Frequency=2338346 Hz, Resolution=427.6527 ns, Timer=TSC
  [Host]     : .NET Framework 4.7.1 (CLR 4.0.30319.42000), 64bit RyuJIT-v4.7.2633.0
  DefaultJob : .NET Framework 4.7.1 (CLR 4.0.30319.42000), 64bit RyuJIT-v4.7.2633.0

Platform (x64)

Method	N	Mean	Min	Max	Allocated
Hash32	1024	179.1 ns	176.9 ns	181.5 ns	0 B
Hash64	1024	112.8 ns	112.5 ns	113.1 ns	0 B
Hash32	1048576	167,038.5 ns	164,833.0 ns	168,950.2 ns	0 B
Hash64	1048576	83,941.7 ns	82,805.5 ns	86,072.0 ns	0 B
Hash32	1073741824	198,183,743.4 ns	197,721,867.3 ns	198,782,071.8 ns	0 B
Hash64	1073741824	112,638,993.1 ns	111,995,167.3 ns	113,573,740.3 ns	0 B

Platform (x86)

Method	N	Mean	Min	Max	Allocated
Hash32	1024	354.9 ns	354.5 ns	355.5 ns	0 B
Hash64	1024	1,380.3 ns	1,361.0 ns	1,398.3 ns	0 B
Hash32	1048576	357,399.4 ns	356,245.1 ns	358,044.0 ns	0 B
Hash64	1048576	1,343,269.5 ns	1,340,923.2 ns	1,345,356.7 ns	0 B
Hash32	1073741824	365,925,742.3 ns	360,332,613.3 ns	369,159,819.6 ns	0 B
Hash64	1073741824	1,388,585,469.4 ns	1,368,307,867.2 ns	1,428,744,362.7 ns	0 B

Speed

Method	x86	x64
Hash32	2.73 GB/s	720 MB/s
Hash64	5.05 GB/s	8.92 GB/s

How to use

	byte[] data = Encoding.UTF8.GetBytes("veni vidi vici");

	uint hash64 = xxHash64.ComputeHash(data, data.Length);
	ulong hash32 = xxHash32.ComputeHash(data, data.Length);