EgorBo

using System.Text.RegularExpressions;

string file = await new HttpClient().GetStringAsync(
    "https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-8/");

MatchCollection pullRequestUrls = 
    Regex.Matches(file, @"https:\/\/github.com\/[a-zA-Z-]+\/[a-zA-Z-]+\/pull\/[0-9]+");
int total = pullRequestUrls.Count;
int i = 1;

EgorBo

using System.Text.RegularExpressions;

/*

Top25 Authors of all 512 PRs in https://devblogs.microsoft.com/dotnet/performance_improvements_in_net_7/
(by count):

stephentoub         -- 148
EgorBo              -- 45
tannergooding       -- 26

EgorBo

using System;
using System.Text.Json;
using System.Text.Json.Serialization;

User? user = JsonSerializer.Deserialize<User>(
    await new HttpClient().GetStringAsync("https://jsonplaceholder.typicode.com/todos/1"), MyJsonContext.Default.User);

Console.WriteLine($"id={user?.id}, title={user?.title}");

public record User(int userId, int id, string title, bool completed);

EgorBo

Legend

• Statistical Test threshold: 10%, the noise filter: 2 ns
• Result is conclusion: Slower|Faster|Same|Noise|Unknown. Noise means that the difference was larger than 10% but not 2 ns.
• Ratio = Base/Diff (the higher the better).
• Alloc Delta = Allocated bytes diff - Allocated bytes base (the lower the better)

Statistics

Total: 52498

EgorBo

Legend

• Statistical Test threshold: 10%, the noise filter: 2 ns
• Result is conclusion: Slower|Faster|Same|Noise|Unknown. Noise means that the difference was larger than 10% but not 2 ns.
• Ratio = Base/Diff (the higher the better).
• Alloc Delta = Allocated bytes diff - Allocated bytes base (the lower the better)

Statistics

Total: 52498

EgorBo

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics;

unsafe class Program
{
    [DllImport("kernel32")]
    static extern byte* VirtualAlloc(IntPtr addr, nuint size, uint typ, uint prot);

EgorBo

How to run jit-diffs for changes in the managed code

All commands are in powershell, should be pretty much the same for bash and non-windows platforms

1. build everything we're going to need:

.\build.cmd Clr+Libs -c Release ;; .\build.cmd Clr -c Checked ;; cd .\src\tests\ ;; .\build.cmd Release generatelayoutonly ;; cd ..\..

2. Make a copy of the test core_root (will be a baseline):

EgorBo

DOTNET_SYSTEM_NET_SOCKETS_INLINE_COMPLETIONS=1 noticeably improves simple TE benchmarks such as the following ones on all UNIX archs. From my understanding, it avoids dispatching from the event-thread to threadpool and does the work in the same thread it got request from.

TE Benchmark	Baseline, RPS	MyTest, RPS	diff, %
ARM64 Platform-JSON PGO	661,663	778,925	+17.72%
ARM64 Platform-Caching PGO	186,188	218,004	+17.09%
ARM64 Platform-Plaintext PGO	6,933,964	7,563,428	+9.08%
x64 Platform-JSON PGO	1,299,388	1,432,200	+10.22%
x64 Platform-Caching PGO	413,123	445,144	+7.75%

EgorBo

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

static class Program
{
    static void Main(string[] args)
    {
        BenchmarkSwitcher.FromAssembly(typeof(MainBenchmarks).Assembly).Run(args);
    }
}

EgorBo

|      Method |        Job |                   Toolchain |      Mean |     Error |    StdDev | Ratio |
|------------ |----------- |----------------------------:|----------:|----------:|----------:|------:|
|     IndexOf | Job-OHKTCB | \Core_Root_Base\corerun.exe | 33.219 ns | 0.0815 ns | 0.0636 ns |  1.00 |
|     IndexOf | Job-QKMCMY | \Core_Root_EGOR\corerun.exe | 16.176 ns | 0.0254 ns | 0.0238 ns |  0.49 |
|             |            |                             |           |           |           |       |
| LastIndexOf | Job-OHKTCB | \Core_Root_Base\corerun.exe | 31.953 ns | 0.0232 ns | 0.0217 ns |  1.00 |
| LastIndexOf | Job-QKMCMY | \Core_Root_EGOR\corerun.exe | 15.704 ns | 0.0374 ns | 0.0312 ns |  0.49 |
|             |            |                             |           |           |           |       |
|    Contains | Job-OHKTCB | \Core_Root_Base\corerun.exe | 27.097 ns | 0.0301 ns | 0.0235 ns |  1.00 |