Benchmarks for #119041 (EgorBo)

[EgorBot]

Processing dotnet/runtime#119041 (comment) command:

Command

-amd -intel -arm

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

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

public class Benchmarks
{
    [Benchmark]
    [Arguments(2)]
    [Arguments(16)]
    [Arguments(64)]
    [Arguments(100)]
    [Arguments(300)]
    [Arguments(512)]
    [Arguments(2048)]
    [Arguments(16*1024)]
    public void NonConstantStackalloc(int n) => Consume(stackalloc byte[n]);

    [MethodImpl(MethodImplOptions.NoInlining)]
    void Consume(Span<byte> span){}
}

(EgorBot will reply in this issue)

[EgorBot]

Benchmark results on linux_azure_genoa

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 9V74, 1 CPU, 16 logical and 8 physical cores
  Job-KIJCHN : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-EQMVCM : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI

Method	Toolchain	n	Mean	Error	Ratio
NonConstantStackalloc	Main	2	1.635 ns	0.0005 ns	1.00
NonConstantStackalloc	PR	2	1.635 ns	0.0004 ns	1.00
NonConstantStackalloc	Main	16	1.635 ns	0.0003 ns	1.00
NonConstantStackalloc	PR	16	1.636 ns	0.0004 ns	1.00
NonConstantStackalloc	Main	64	2.504 ns	0.0003 ns	1.00
NonConstantStackalloc	PR	64	1.635 ns	0.0004 ns	0.65
NonConstantStackalloc	Main	100	3.322 ns	0.0005 ns	1.00
NonConstantStackalloc	PR	100	1.363 ns	0.0004 ns	0.41
NonConstantStackalloc	Main	300	6.591 ns	0.0008 ns	1.00
NonConstantStackalloc	PR	300	2.204 ns	0.0195 ns	0.33
NonConstantStackalloc	Main	512	14.081 ns	0.0113 ns	1.00
NonConstantStackalloc	PR	512	4.003 ns	0.0009 ns	0.28
NonConstantStackalloc	Main	2048	38.923 ns	0.0525 ns	1.00
NonConstantStackalloc	PR	2048	22.403 ns	0.0020 ns	0.58
NonConstantStackalloc	Main	16384	323.237 ns	0.0349 ns	1.00
NonConstantStackalloc	PR	16384	155.960 ns	0.0163 ns	0.48

BDN_Artifacts.zip

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

[EgorBot]

Benchmark results on linux_azure_cobalt100

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
Neoverse-N2, 16 physical cores
  Job-GIUPIO : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-WTZQJL : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	n	Mean	Error	Ratio
NonConstantStackalloc	Main	2	2.005 ns	0.0006 ns	1.00
NonConstantStackalloc	PR	2	1.943 ns	0.0003 ns	0.97
NonConstantStackalloc	Main	16	2.014 ns	0.0007 ns	1.00
NonConstantStackalloc	PR	16	1.894 ns	0.0004 ns	0.94
NonConstantStackalloc	Main	64	2.117 ns	0.0002 ns	1.00
NonConstantStackalloc	PR	64	2.357 ns	0.0014 ns	1.11
NonConstantStackalloc	Main	100	3.057 ns	0.0005 ns	1.00
NonConstantStackalloc	PR	100	3.141 ns	0.0044 ns	1.03
NonConstantStackalloc	Main	300	6.748 ns	0.0029 ns	1.00
NonConstantStackalloc	PR	300	6.635 ns	0.0007 ns	0.98
NonConstantStackalloc	Main	512	10.817 ns	0.0071 ns	1.00
NonConstantStackalloc	PR	512	10.557 ns	0.0078 ns	0.98
NonConstantStackalloc	Main	2048	39.287 ns	0.0165 ns	1.00
NonConstantStackalloc	PR	2048	38.443 ns	0.0033 ns	0.98
NonConstantStackalloc	Main	16384	308.377 ns	0.0328 ns	1.00
NonConstantStackalloc	PR	16384	307.532 ns	0.0201 ns	1.00

BDN_Artifacts.zip

cc @EgorBo (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, 16 logical and 8 physical cores
  Job-XIDXEB : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
  Job-PJCSRB : .NET 10.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI

Method	Toolchain	n	Mean	Error	Ratio
NonConstantStackalloc	Main	2	1.726 ns	0.0004 ns	1.00
NonConstantStackalloc	PR	2	1.725 ns	0.0005 ns	1.00
NonConstantStackalloc	Main	16	1.726 ns	0.0004 ns	1.00
NonConstantStackalloc	PR	16	1.726 ns	0.0006 ns	1.00
NonConstantStackalloc	Main	64	3.164 ns	0.0007 ns	1.00
NonConstantStackalloc	PR	64	1.839 ns	0.0005 ns	0.58
NonConstantStackalloc	Main	100	5.994 ns	0.0337 ns	1.00
NonConstantStackalloc	PR	100	1.840 ns	0.0002 ns	0.31
NonConstantStackalloc	Main	300	7.746 ns	0.0188 ns	1.00
NonConstantStackalloc	PR	300	1.939 ns	0.0255 ns	0.25
NonConstantStackalloc	Main	512	11.353 ns	0.0384 ns	1.00
NonConstantStackalloc	PR	512	4.177 ns	0.0008 ns	0.37
NonConstantStackalloc	Main	2048	39.302 ns	0.0123 ns	1.00
NonConstantStackalloc	PR	2048	19.214 ns	0.0035 ns	0.49
NonConstantStackalloc	Main	16384	303.593 ns	0.0450 ns	1.00
NonConstantStackalloc	PR	16384	85.821 ns	0.0411 ns	0.28

BDN_Artifacts.zip

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