private int[] GetHashBuckets(byte[] b, int hashCount, int max)
{
var result = new int[hashCount];
var hash1 = MurmurHash.Hash(b, 0, b.Length, 0);
var hash2 = MurmurHash.Hash(b, 0, b.Length, hash1);
for (var i = 0; i < hashCount; i++)
{
var tempMod = (int)(hash1 + i * hash2) % max;
result[i] = Math.Abs(tempMod);
}
return(result);
}
public void TestPerformanceMurmurHash()
{
var warmupLoopCount = 1; // 1000000;
var measureLoopCount = 1; // 1000000000;
// init
string[] texts =
{
"joe", "melissa", "townhall",
"ballpark", "trial-by-error",
"house", "teamwork",
"recommendation", "partial",
"soccer ball"
};
var bytes = new byte[texts.Length][];
for (var i = 0; i < texts.Length; i++)
{
bytes[i] = texts[i].GetUTF8Bytes();
}
// warmup
for (var i = 0; i < warmupLoopCount; i++)
{
var bytearr = bytes[i % bytes.Length];
var code = MurmurHash.Hash(bytearr, 0, bytearr.Length, 0);
if (code == 0)
{
Console.Out.WriteLine("A zero code");
}
}
// run
// 23.3 for 1G for MurmurHash.hash
long start = PerformanceObserver.NanoTime;
for (var i = 0; i < measureLoopCount; i++)
{
var bytearr = bytes[i % bytes.Length];
var codeOne = MurmurHash.Hash(bytearr, 0, bytearr.Length, 0);
if (codeOne == 0)
{
Console.Out.WriteLine("A zero code");
}
}
var delta = PerformanceObserver.NanoTime - start;
// Comment me in - System.out.println("Delta " + (delta / 1000000000.0));
}
public int GetHashCode(T[] a1)
{
if (typeof(T) == typeof(byte))
{
return((int)MurmurHash.Hash(a1 as byte[]));
}
int num = 0;
for (int i = 0; i < a1.Length; i++)
{
int num2 = 8 * (i % 4);
int num3 = a1[i].GetHashCode() << num2;
num ^= num3;
}
return(num);
}
public void TestPerformanceMurmurHash()
{
const int warmupLoopCount = 1; // 1000000;
const int measureLoopCount = 1; // 1000000000;
// init
var texts = new string[] { "joe", "melissa", "townhall", "ballpark", "trial-by-error", "house", "teamwork", "recommendation", "partial", "soccer ball" };
var bytes = new byte[texts.Length][];
for (var i = 0; i < texts.Length; i++)
{
bytes[i] = Encoding.Unicode.GetBytes(texts[i]);
}
// warmup
for (var i = 0; i < warmupLoopCount; i++)
{
var bytearr = bytes[i % bytes.Length];
var code = MurmurHash.Hash(bytearr, 0, bytearr.Length, 0);
if (code == 0)
{
Console.WriteLine("A zero code");
}
}
// run
// 23.3 for 1G for MurmurHash.hash
var delta = PerformanceObserver.TimeNano(() =>
{
for (var i = 0; i < measureLoopCount; i++)
{
var bytearr = bytes[i % bytes.Length];
var codeOne = MurmurHash.Hash(bytearr, 0, bytearr.Length, 0);
if (codeOne == 0)
{
Console.WriteLine("A zero code");
}
}
});
// Comment me in - Console.WriteLine("Delta " + (delta / 1000000000.0));
}
/// <summary>
/// 转为MurmurHash
/// </summary>
/// <param name="str">字符串</param>
/// <returns></returns>
public static uint ToMurmurHash(this string str)
{
return(MurmurHash.Hash(Encoding.UTF8.GetBytes(str)));
}
/// <summary>
/// Initializes a new instance of the <see cref="Blob"/> class.
/// </summary>
/// <param name="data">The data.</param>
public Blob(byte[] data)
{
_data = data;
_hash = MurmurHash.Hash(data, 0, data.Length, 0);
}