Created
January 13, 2021 06:09
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ModuloVsFastRange benchmark.cs
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| using BenchmarkDotNet.Attributes; | |
| using BenchmarkDotNet.Jobs; | |
| using BenchmarkDotNet.Running; | |
| using System; | |
| namespace FastRangeBenchmark | |
| { | |
| class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| var summary = BenchmarkRunner.Run<ModuloVsFastRange>(); | |
| Console.WriteLine(summary.ToString()); | |
| } | |
| } | |
| [SimpleJob(RuntimeMoniker.CoreRt50)] | |
| public class ModuloVsFastRange | |
| { | |
| [Params(10)] | |
| public int N; | |
| public long[] aa; | |
| public long b; | |
| long LongRandom(long min, long max, Random rand) | |
| { | |
| byte[] buf = new byte[8]; | |
| rand.NextBytes(buf); | |
| long longRand = BitConverter.ToInt64(buf, 0); | |
| return (Math.Abs(longRand % (max - min)) + min); | |
| } | |
| [IterationSetup] | |
| public void Setup() | |
| { | |
| Random rand = new Random(); | |
| aa = new long[1000]; | |
| for(int i = 0; i < 1000; i++) | |
| { | |
| aa[i] = LongRandom(0, long.MaxValue, rand); | |
| } | |
| b = LongRandom(0, long.MaxValue, rand); | |
| } | |
| [Benchmark] | |
| public long Modulo() | |
| { | |
| long val = 0L; | |
| for (int i = 0; i < 1000; i++) | |
| { | |
| val = aa[i] % b; | |
| } | |
| return val; | |
| } | |
| [Benchmark] | |
| public long FastRange() | |
| { | |
| long val = 0L; | |
| for (int i = 0; i < 1000; i++) | |
| { | |
| ulong u = (ulong)aa[i]; | |
| ulong v = (ulong)b; | |
| var u0 = (ulong)(uint)u; | |
| var u1 = u >> 32; | |
| var v0 = (ulong)(uint)v; | |
| var v1 = v >> 32; | |
| var carry = u0 * v0; | |
| carry = (carry >> 32) + (u0 * v1); | |
| var r2 = carry >> 32; | |
| carry = (uint)carry + (u1 * v0); | |
| val = (long)((carry >> 32) + r2 + (u1 * v1)); | |
| } | |
| return val; | |
| } | |
| // using two ulong value to store the UInt128 | |
| private (ulong, ulong) Multiply(ulong u, ulong v) | |
| { | |
| var u0 = (ulong)(uint)u; | |
| var u1 = u >> 32; | |
| var v0 = (ulong)(uint)v; | |
| var v1 = v >> 32; | |
| var carry = u0 * v0; | |
| var r0 = (uint)carry; | |
| carry = (carry >> 32) + (u0 * v1); | |
| var r2 = carry >> 32; | |
| carry = (uint)carry + (u1 * v0); | |
| return (carry << 32 | r0, (carry >> 32) + r2 + (u1 * v1)); | |
| } | |
| } | |
| } |
Author
gaufung
commented
Jan 13, 2021
| Method | N | Mean | Error | StdDev | Median |
|---|---|---|---|---|---|
| Modulo | 10 | 7.392 us | 0.0767 us | 0.0641 us | 7.400 us |
| FastRange | 10 | 2.368 us | 0.2496 us | 0.7359 us | 1.900 us |
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