BenchmarkDotNetWithRuntimeMoniker.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;

[SimpleJob(RuntimeMoniker.Net60)]
[MinColumn, MaxColumn]
public class Test
{
    public static int A = 0;
    private const int Max = 10_000;
    
    [Benchmark]
    public void MethodSingleElement()
    {
        A = 0;
        var arr = Enumerable.Range(0, Max).ToArray();
        for (long i =0; i < Max; i++)
        {
            unchecked
            {
                A += arr[i];
            }
        }
    }
    
    [Benchmark]
    public void MethodDiv()
    {
        A = 0;
        var arr = Enumerable.Range(0, Max).ToArray();
        for (long i = 0; i < Max; i += 4)
        {
            unchecked
            {
                A += arr[i];
                A += arr[i+1];
                A += arr[i+2];
                A += arr[i+3];
            }
        }
    }
}

public static class Program
{
    public static void Main(string[] arr)
    {
        var summary = BenchmarkRunner.Run<Test>();
        //foreach(var s in summary)
        //{
        //    Console.WriteLine(s.ToString());
        //}
        //Console.WriteLine(Test.A);
    }
}