Benchmarks for #123158 (stephentoub)

[EgorBot]

Processing dotnet/runtime#123158 (comment) command:

Command

-amd -intel -arm

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

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

[MemoryDiagnoser]
public class Benchmarks
{
    [Benchmark]
    [Arguments("a", "b")]
    public string Join(string s1, string s2) => string.Join("", s1, s2);

    [Benchmark]
    [Arguments("a", "b")]
    public string Concat(string s1, string s2) => string.Concat([s1, s2]);    
}

(EgorBot will reply in this issue)

[EgorBot]

Benchmark results on linux_azure_cobalt100

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
Neoverse-N2, 8 physical cores
  Job-KYMIST : .NET 11.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-ASOLHY : .NET 11.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	s1	s2	Mean	Error	Ratio	Gen0	Allocated	Alloc Ratio
Join	Main	a	b	13.92 ns	0.073 ns	1.00	0.0005	32 B	1.00
Join	PR	a	b	14.52 ns	0.058 ns	1.04	0.0005	32 B	1.00
Concat	Main	a	b	14.29 ns	0.056 ns	1.00	0.0005	32 B	1.00
Concat	PR	a	b	14.37 ns	0.043 ns	1.01	0.0005	32 B	1.00

Artifacts.zip

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

[EgorBot]

Benchmark results on linux_azure_genoa

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 9V74, 1 CPU, 8 logical and 4 physical cores
  Job-CTQILI : .NET 11.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-SKVMQL : .NET 11.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI

Method	Toolchain	s1	s2	Mean	Error	Ratio	Gen0	Allocated	Alloc Ratio
Join	Main	a	b	15.77 ns	0.126 ns	1.00	0.0019	32 B	1.00
Join	PR	a	b	15.54 ns	0.162 ns	0.99	0.0019	32 B	1.00
Concat	Main	a	b	16.11 ns	0.128 ns	1.00	0.0019	32 B	1.00
Concat	PR	a	b	15.51 ns	0.148 ns	0.96	0.0019	32 B	1.00

Artifacts.zip

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

[EgorBot]

Benchmark results on linux_azure_cascadelake

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 8 logical and 4 physical cores
  Job-EYERME : .NET 11.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-LPCROH : .NET 11.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI

Method	Toolchain	s1	s2	Mean	Error	Ratio	Gen0	Allocated	Alloc Ratio
Join	Main	a	b	15.43 ns	0.187 ns	1.00	0.0013	32 B	1.00
Join	PR	a	b	15.96 ns	0.114 ns	1.03	0.0013	32 B	1.00
Concat	Main	a	b	15.92 ns	0.216 ns	1.00	0.0013	32 B	1.00
Concat	PR	a	b	16.95 ns	0.254 ns	1.06	0.0013	32 B	1.00

Artifacts.zip

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