stringreplace.cs

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Environments;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;

[MemoryDiagnoser]
public class Program
{
    // run as admin 
    public static void Main(string[] args)
    {
        var config = DefaultConfig.Instance
            //.AddJob(Job.Default.WithRuntime(CoreRuntime.Core31).WithEnvironmentVariable("COMPlus_JitDisablePGO", "1"))
            //.AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariable("COMPlus_JitDisablePGO", "1"))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.CreateForNewVersion("net7.0", ".NET 7.0")).WithEnvironmentVariable("COMPlus_JitDisablePGO", "1").AsBaseline())
            .AddJob(Job.Default.WithRuntime(CoreRuntime.CreateForNewVersion("net7.0", ".NET 7.0")).WithEnvironmentVariables(new[] {new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableHWIntrinsic", "0")}))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.CreateForNewVersion("net7.0", ".NET 7.0")).WithEnvironmentVariables(new[] {new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableSSE3", "0")}))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.CreateForNewVersion("net7.0", ".NET 7.0")).WithEnvironmentVariables(new[] {new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableAVX", "0")}))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.CreateForNewVersion("net7.0", ".NET 7.0")).WithEnvironmentVariables(new[] {new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableAVX2", "0")}))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariable("COMPlus_JitDisablePGO", "1"))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariables(new[] { new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableHWIntrinsic", "0") }))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariables(new[] { new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableSSE3", "0") }))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariables(new[] { new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableAVX", "0") }))
            .AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariables(new[] { new EnvironmentVariable("COMPlus_JitDisablePGO", "1"), new EnvironmentVariable("COMPlus_EnableAVX2", "0") }));
        //.AddJob(Job.Default.WithRuntime(ClrRuntime.Net48).WithEnvironmentVariable("COMPlus_JitDisablePGO", "1"))
        //.AddJob(Job.Default.WithRuntime(CoreRuntime.Core31).WithEnvironmentVariable("COMPlus_JitDisablePGO", "0"))
        //.AddJob(Job.Default.WithRuntime(CoreRuntime.Core60).WithEnvironmentVariable("COMPlus_JitDisablePGO", "0"))
        //.AddJob(Job.Default.WithRuntime(CoreRuntime.CreateForNewVersion("net7.0", ".NET 7.0")).WithEnvironmentVariable("COMPlus_JitDisablePGO", "0").AsBaseline())
        //.AddJob(Job.Default.WithRuntime(ClrRuntime.Net48).WithEnvironmentVariable("COMPlus_JitDisablePGO", "0"));
        BenchmarkRunner.Run(typeof(Program).Assembly, args: args, config: config);
    }

    //[Benchmark(Baseline = true)]
    //public DateTime DateTimeNow_NoDST() = > DateTime.Now;

        const string Input = 
        "        Whose woods these are I think I know.\n" +
        "        His house is in the village though;\n" +
        "        He will not see me stopping here\n" +
        "        To watch his woods fill up with snow.\n" +
        "        My little horse must think it queer\n" +
        "        To stop without a farmhouse near\n" +
        "        Between the woods and frozen lake\n" +
        "        The darkest evening of the year.\n" +
        "        He gives his harness bells a shake\n" +
        "        To ask if there is some mistake.\n" +
        "        The only other sound’s the sweep\n" +
        "        Of easy wind and downy flake.\n" +
        "        The woods are lovely, dark and deep,\n" +
        "        But I have promises to keep,\n" +
        "        And miles to go before I sleep,\n" +
        "        And miles to go before I sleep.\n";

    [Benchmark]
        public string Replace() => Input.Replace('I', 'U');
}