Benchmarks for #117583 (EgorBo)

[EgorBot]

Processing dotnet/runtime#117583 (comment) command:

Command

-amd -arm -windows_intel

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

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

public class Benchmarks
{
    static object[] _strings = new string[4];

    [Benchmark]
    public void AssignString()
    {
        var arr = _strings;
        if (arr.Length >= 4)
        {
            arr[0] = "";
            arr[1] = "";
            arr[2] = "";
            arr[3] = "";
        }
    }

    [Benchmark]
    public void SwapElements()
    {
        var arr = _strings;
        (arr[1], arr[0]) = (arr[0], arr[1]);
    }

    [Benchmark]
    public void SingleAssignment()
    {
        _strings[0] = "";
    }
}

(EgorBot will reply in this issue)

[EgorBot]

Benchmark results on linux_azure_genoa

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.2 LTS (Noble Numbat)
AMD EPYC 9V74, 1 CPU, 16 logical and 8 physical cores
  Job-CZCOUG : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-CLALXA : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI

Method	Toolchain	Mean	Error	Ratio
AssignString	Main	7.5633 ns	0.0022 ns	1.00
AssignString	PR	1.3160 ns	0.0033 ns	0.17
SwapElements	Main	2.9979 ns	0.0008 ns	1.00
SwapElements	PR	1.0471 ns	0.0012 ns	0.35
SingleAssignment	Main	1.9075 ns	0.0005 ns	1.00
SingleAssignment	PR	0.2723 ns	0.0002 ns	0.14

BDN_Artifacts.zip

cc @EgorBo (agent_logs.txt). EgorBot manual: link.

[EgorBot]

Benchmark results on linux_azure_cobalt100

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.2 LTS (Noble Numbat)
Neoverse-N2, 16 physical cores
  Job-ZYNMKL : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-HDSIXC : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	Mean	Error	Ratio
AssignString	Main	10.3296 ns	0.0032 ns	1.00
AssignString	PR	1.8738 ns	0.0006 ns	0.18
SwapElements	Main	2.6604 ns	0.0012 ns	1.00
SwapElements	PR	1.1768 ns	0.0024 ns	0.44
SingleAssignment	Main	1.9655 ns	0.0023 ns	1.00
SingleAssignment	PR	0.3821 ns	0.0003 ns	0.19

BDN_Artifacts.zip

cc @EgorBo (agent_logs.txt). EgorBot manual: link.