EgorBot for AndyAyersMS in #109209

[EgorBot]

Processing dotnet/runtime#109209 (comment) command:

Command

-intel -arm64

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System.Runtime.CompilerServices;

BenchmarkSwitcher.FromAssembly(typeof(Bench).Assembly).Run(args);

public class Bench
{
    string[] s_ro_str_array = new string[512];

    [Benchmark]
    public int Foreach()
    {
        IEnumerable<string> e = s_ro_str_array;
        int sum = 0;
        foreach (string s in e) sum += s == null ? 0 : s.Length;
        return sum;
    }

    [Benchmark]
    public int Count() => CountInner(s_ro_str_array);

    [MethodImpl(MethodImplOptions.NoInlining)]
    int CountInner(ICollection<string> c) => c.Count;
}

(EgorBot will reply in this issue)

[EgorBot]

Benchmark results on Arm64

BenchmarkDotNet v0.14.0, Ubuntu 24.04 LTS (Noble Numbat)
Arm64
  Job-UXBTJA : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-VJTWZI : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	Mean	Error	Ratio
Foreach	Main	1,297.675 ns	0.0915 ns	1.00
Foreach	PR	282.593 ns	0.8442 ns	0.22
Count	Main	1.111 ns	0.0003 ns	1.00
Count	PR	1.071 ns	0.0003 ns	0.96

BDN_Artifacts.zip

[EgorBot]

cc @AndyAyersMS (logs)

[EgorBot]

Benchmark results on Intel

BenchmarkDotNet v0.14.0, Ubuntu 24.04 LTS (Noble Numbat)
Intel Xeon Platinum 8488C, 1 CPU, 8 logical and 4 physical cores
  Job-GNMMMF : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-ZDWMNG : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI

Method	Toolchain	Mean	Error	Ratio
Foreach	Main	382.5067 ns	1.2694 ns	1.00
Foreach	PR	298.1094 ns	1.5452 ns	0.78
Count	Main	3.7048 ns	0.0246 ns	1.00
Count	PR	0.5671 ns	0.0118 ns	0.15

BDN_Artifacts.zip

[EgorBot]

cc @AndyAyersMS (logs)