Benchmarks for #121986 (EgorBo)

[EgorBot]

Processing dotnet/runtime#121986 (comment) command:

Command

-arm

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

public class Benchmarks
{
    [Benchmark] public void Stackalloc64() => Consume(stackalloc byte[64]);
    [Benchmark] public void Stackalloc128() => Consume(stackalloc byte[128]);
    [Benchmark] public void Stackalloc256() => Consume(stackalloc byte[256]);
    [Benchmark] public void Stackalloc512() => Consume(stackalloc byte[512]);
    [Benchmark] public void Stackalloc1024() => Consume(stackalloc byte[1024]);
    [Benchmark] public void Stackalloc16384() => Consume(stackalloc byte[16384]);

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

(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, 16 physical cores
  Job-GMSLFF : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-FOFUGR : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	Mean	Error	Ratio
Stackalloc64	Main	2.671 ns	0.0042 ns	1.00
Stackalloc64	PR	1.702 ns	0.0005 ns	0.64
Stackalloc128	Main	3.355 ns	0.0007 ns	1.00
Stackalloc128	PR	2.167 ns	0.0005 ns	0.65
Stackalloc256	Main	4.422 ns	0.0008 ns	1.00
Stackalloc256	PR	3.333 ns	0.0008 ns	0.75
Stackalloc512	Main	10.434 ns	0.0007 ns	1.00
Stackalloc512	PR	10.157 ns	0.0014 ns	0.97
Stackalloc1024	Main	19.708 ns	0.0029 ns	1.00
Stackalloc1024	PR	14.970 ns	0.0095 ns	0.76
Stackalloc16384	Main	307.266 ns	0.0246 ns	1.00
Stackalloc16384	PR	94.329 ns	0.2647 ns	0.31

Artifacts.zip

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

[EgorBo]

@EgorBot -azure_arm -aws_arm

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

public class Benchmarks
{
    [Benchmark] public void Stackalloc64() => Consume(stackalloc byte[64]);
    [Benchmark] public void Stackalloc128() => Consume(stackalloc byte[128]);
    [Benchmark] public void Stackalloc256() => Consume(stackalloc byte[256]);
    [Benchmark] public void Stackalloc512() => Consume(stackalloc byte[512]);
    [Benchmark] public void Stackalloc1024() => Consume(stackalloc byte[1024]);
    [Benchmark] public void Stackalloc16384() => Consume(stackalloc byte[16384]);

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

[EgorBot]

Benchmark results on linux_aws_graviton4

BenchmarkDotNet v0.15.0, Linux Ubuntu 24.04 LTS (Noble Numbat)
Neoverse-V2, 16 physical cores
  Job-SPDEHA : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-BOESVS : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	Mean	Error	Ratio
Stackalloc64	Main	3.425 ns	0.0004 ns	1.00
Stackalloc64	PR	2.559 ns	0.0008 ns	0.75
Stackalloc128	Main	3.999 ns	0.0002 ns	1.00
Stackalloc128	PR	2.404 ns	0.0003 ns	0.60
Stackalloc256	Main	5.431 ns	0.0005 ns	1.00
Stackalloc256	PR	2.754 ns	0.0003 ns	0.51
Stackalloc512	Main	12.661 ns	0.2744 ns	1.00
Stackalloc512	PR	7.423 ns	0.0008 ns	0.59
Stackalloc1024	Main	24.958 ns	0.5326 ns	1.00
Stackalloc1024	PR	14.031 ns	0.0040 ns	0.56
Stackalloc16384	Main	374.899 ns	0.0130 ns	1.00
Stackalloc16384	PR	111.029 ns	1.2123 ns	0.30

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-WQOZCW : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD
  Job-ZDHIZV : .NET 10.0.0 (42.42.42.42424), Arm64 RyuJIT AdvSIMD

Method	Toolchain	Mean	Error	Ratio
Stackalloc64	Main	2.686 ns	0.0039 ns	1.00
Stackalloc64	PR	1.676 ns	0.0004 ns	0.62
Stackalloc128	Main	3.206 ns	0.0006 ns	1.00
Stackalloc128	PR	2.307 ns	0.0011 ns	0.72
Stackalloc256	Main	4.564 ns	0.0006 ns	1.00
Stackalloc256	PR	3.652 ns	0.0006 ns	0.80
Stackalloc512	Main	10.434 ns	0.0008 ns	1.00
Stackalloc512	PR	8.757 ns	0.0226 ns	0.84
Stackalloc1024	Main	19.814 ns	0.0020 ns	1.00
Stackalloc1024	PR	13.488 ns	0.0021 ns	0.68
Stackalloc16384	Main	307.261 ns	0.0297 ns	1.00
Stackalloc16384	PR	94.694 ns	0.1574 ns	0.31

Artifacts.zip

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