FastRng/FastRngTests/PerformanceTests.cs

using System;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Threading.Tasks;
using FastRng;
using FastRng.Distributions;
using MathNet.Numerics.Distributions;
using MathNet.Numerics.Random;
using NUnit.Framework;

namespace FastRngTests;

[ExcludeFromCodeCoverage]
public class PerformanceTests
{
    #region FastRng

    [Test]
    [Category(TestCategories.PERFORMANCE)]
    public async Task Generate1MUniform()
    {
        using var rng = new MultiThreadedRng<float>();
        var data = new float[1_000_000];
        var stopwatch = new Stopwatch();
        Thread.Sleep(TimeSpan.FromSeconds(10)); // Warm-up phase of generator
            
        stopwatch.Start();
        for (uint n = 0; n < data.Length; n++)
            data[n] = await rng.GetUniform();
            
        stopwatch.Stop();

        TestContext.WriteLine($"Generated 1M uniform distributed random numbers in {stopwatch.Elapsed.Minutes} minute(s), {stopwatch.Elapsed.Seconds} second(s), and {stopwatch.Elapsed.Milliseconds} milliseconds.");
    }
        
    [Test]
    [Category(TestCategories.PERFORMANCE)]
    public async Task Generate1MNormal()
    {
        using var rng = new MultiThreadedRng<float>();
        var dist = new NormalS02M05<float>(rng);
        var data = new float[1_000_000];
        var stopwatch = new Stopwatch();
        Thread.Sleep(TimeSpan.FromSeconds(10)); // Warm-up phase of generator
            
        stopwatch.Start();
        for (uint n = 0; n < data.Length; n++)
            data[n] = await dist.NextNumber();
            
        stopwatch.Stop();

        TestContext.WriteLine($"Generated 1M normal distributed random numbers in {stopwatch.Elapsed.Minutes} minute(s), {stopwatch.Elapsed.Seconds} second(s), and {stopwatch.Elapsed.Milliseconds} milliseconds.");
    }
        
    [Test]
    [Category(TestCategories.PERFORMANCE)]
    public async Task Generate1MChiSquare()
    {
        using var rng = new MultiThreadedRng<float>();
        var dist = new ChiSquareK4<float>(rng);
        var data = new float[1_000_000];
        var stopwatch = new Stopwatch();
        Thread.Sleep(TimeSpan.FromSeconds(10)); // Warm-up phase of generator
            
        stopwatch.Start();
        for (uint n = 0; n < data.Length; n++)
            data[n] = await dist.NextNumber();
            
        stopwatch.Stop();

        TestContext.WriteLine($"Generated 1M chi-square distributed random numbers in {stopwatch.Elapsed.Minutes} minute(s), {stopwatch.Elapsed.Seconds} second(s), and {stopwatch.Elapsed.Milliseconds} milliseconds.");
    }

    #endregion

    #region Math.NET

    [Test]
    [Category(TestCategories.PERFORMANCE)]
    public void ComparisonMathNet1MUniform()
    {
        var rng = new Xorshift(true);
        var data = new float[1_000_000];
        var stopwatch = new Stopwatch();
        Thread.Sleep(TimeSpan.FromSeconds(10)); // Warm-up phase of generator
            
        stopwatch.Start();
        for (uint n = 0; n < data.Length; n++)
            data[n] = (float) rng.NextDouble();
            
        stopwatch.Stop();
            
        TestContext.WriteLine($"Generated 1M uniform distributed random numbers by means of Math.NET in {stopwatch.Elapsed.Minutes} minute(s), {stopwatch.Elapsed.Seconds} second(s), and {stopwatch.Elapsed.Milliseconds} milliseconds.");
    }
        
    [Test]
    [Category(TestCategories.PERFORMANCE)]
    public void ComparisonMathNet1MNormal()
    {
        var rng = new Xorshift(true);
        var dist = new Normal(stddev: 0.2f, mean: 0.5f, randomSource: rng);
        var data = new float[1_000_000];
        var stopwatch = new Stopwatch();
        Thread.Sleep(TimeSpan.FromSeconds(10)); // Warm-up phase of generator
            
        stopwatch.Start();
        for (uint n = 0; n < data.Length; n++)
            data[n] = (float) dist.Sample();
            
        stopwatch.Stop();
            
        TestContext.WriteLine($"Generated 1M normal distributed random numbers by means of Math.NET in {stopwatch.Elapsed.Minutes} minute(s), {stopwatch.Elapsed.Seconds} second(s), and {stopwatch.Elapsed.Milliseconds} milliseconds.");
    }
        
    [Test]
    [Category(TestCategories.PERFORMANCE)]
    public void ComparisonMathNet1MChiSquare()
    {
        var rng = new Xorshift(true);
        var dist = new ChiSquared(4);
        var data = new float[1_000_000];
        var stopwatch = new Stopwatch();
        Thread.Sleep(TimeSpan.FromSeconds(10)); // Warm-up phase of generator
            
        stopwatch.Start();
        for (uint n = 0; n < data.Length; n++)
            data[n] = (float) dist.Sample();
            
        stopwatch.Stop();
            
        TestContext.WriteLine($"Generated 1M chi-squared distributed random numbers by means of Math.NET in {stopwatch.Elapsed.Minutes} minute(s), {stopwatch.Elapsed.Seconds} second(s), and {stopwatch.Elapsed.Milliseconds} milliseconds.");
    }

    #endregion
}