EgorBot for EgorBo in #109036

[EgorBot]

Processing dotnet/runtime#109036 (comment) command:

Command

-arm64 -amd --envvars DOTNET_JitDisasm:Bestcase

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

public class Bench
{
    string s = "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10/";

    [Benchmark]
    public bool Bestcase() => 
        s.StartsWith("https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10", StringComparison.Ordinal);
    
    [Benchmark]
    public bool Bestcase_IgnoreCase() => 
        s.StartsWith("https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10", StringComparison.OrdinalIgnoreCase);

    // Worst case: differs at 1st char:

    [Benchmark]
    public bool Worstcase() => 
        s.StartsWith("xttps://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10", StringComparison.Ordinal);
    
    [Benchmark]
    public bool Worstcase_IgnoreCase() => 
        s.StartsWith("xttps://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10", StringComparison.OrdinalIgnoreCase);
}

(EgorBot will reply in this issue)

[EgorBot]

Benchmark results on Amd

BenchmarkDotNet v0.14.0, Ubuntu 24.04 LTS (Noble Numbat)
AMD EPYC 9R14, 1 CPU, 16 logical and 16 physical cores
  Job-JAAFPY : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-NJQEAS : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
EnvironmentVariables=DOTNET_JitDisasm=Bestcase

Method	Toolchain	Mean	Error	Ratio
Bestcase	Main	1.237 ns	0.0415 ns	1.00
Bestcase	PR	1.377 ns	0.0364 ns	1.11
Bestcase_IgnoreCase	Main	1.745 ns	0.0531 ns	1.00
Bestcase_IgnoreCase	PR	1.826 ns	0.0630 ns	1.05
Worstcase	Main	1.247 ns	0.0377 ns	1.00
Worstcase	PR	1.362 ns	0.0549 ns	1.09
Worstcase_IgnoreCase	Main	1.745 ns	0.0576 ns	1.00
Worstcase_IgnoreCase	PR	1.881 ns	0.0635 ns	1.08

BDN_Artifacts.zip

[EgorBot]

cc @EgorBo (logs)

[EgorBot]

Benchmark results on Arm64

BenchmarkDotNet v0.14.0, Ubuntu 24.04 LTS (Noble Numbat)
Arm64
  Job-WLBDRZ : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-BZXXWS : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
EnvironmentVariables=DOTNET_JitDisasm=Bestcase

Method	Toolchain	Mean	Error	Ratio
Bestcase	Main	4.5125 ns	0.0027 ns	1.00
Bestcase	PR	1.1872 ns	0.0027 ns	0.26
Bestcase_IgnoreCase	Main	8.9857 ns	0.0681 ns	1.00
Bestcase_IgnoreCase	PR	2.4571 ns	0.0020 ns	0.27
Worstcase	Main	0.2392 ns	0.0122 ns	1.00
Worstcase	PR	1.5188 ns	0.0086 ns	6.36
Worstcase_IgnoreCase	Main	2.4944 ns	0.0011 ns	1.00
Worstcase_IgnoreCase	PR	2.4822 ns	0.0115 ns	1.00

BDN_Artifacts.zip

[EgorBot]

cc @EgorBo (logs)