public unsafe void CRCCopyBenchmark()
{
var lens = new int[] { 1, 2, 3, 4, 7, 8, 9, 15, 16, 31, 32, 63, 64, 255, 256, 511, 512, 1023, 1024 };
foreach (var len in lens)
{
var arr = new byte[len];
var memory = (Memory <byte>)arr;
var handle = memory.Pin();
var ptr = (byte *)handle.Pointer;
var arrDest = new byte[len];
var memoryDest = (Memory <byte>)arrDest;
var handleDest = memoryDest.Pin();
var copyTarget = (byte *)handleDest.Pointer;
var rng = new Random(42);
rng.NextBytes(arr);
var count = 1_000_000_000;
var cnt = count / len;
var sum = 0UL;
uint crc0, crc1, crc2, crc3;
{
uint digest = 0;
using (Benchmark.Run("CRC32+Copy Intrinsic", count, true))
{
for (int i = 0; i < cnt; i++)
{
digest = Crc32C.CopyWithCrc32C(ptr, len, copyTarget, digest);
}
}
crc0 = digest;
}
//{
// uint digest = 0;
// using (Benchmark.Run("CRC32 Only Intrinsic", count, true))
// {
// for (int i = 0; i < cnt; i++)
// {
// digest = Crc32C.CalculateCrc32C(ptr, len, digest);
// }
// }
// crc1 = digest;
//}
{
uint digest = 0;
using (Benchmark.Run("CRC32+Copy Manual", count, true))
{
for (int i = 0; i < cnt; i++)
{
digest = Crc32C.CopyWithCrc32CManual(ptr, len, copyTarget, digest);
}
}
crc3 = digest;
}
//{
// using (Benchmark.Run("Copy only", count, true))
// {
// for (int i = 0; i < cnt; i++)
// {
// System.Runtime.CompilerServices.Unsafe.CopyBlockUnaligned(copyTarget, ptr, (uint)len);
// }
// }
//}
//{
// var crc32C = new Ralph.Crc32C.Crc32C();
// uint digest = 0;
// using (Benchmark.Run("CRC32 Checksum Ralph", count, true))
// {
// for (int i = 0; i < cnt; i++)
// {
// crc32C.Update(arr, 0, arr.Length);
// digest = crc32C.GetIntValue();
// }
// }
// crc2 = digest;
//}
//Assert.AreEqual(crc0, crc1);
//Assert.AreEqual(crc0, crc2);
Assert.AreEqual(crc0, crc3);
Benchmark.Dump("LEN: " + len);
}
}