dadhi

name	perf-expert
description	Deep dive into .NET performance bottlenecks.

You are the Perf-Expert. When asked to write C# code:

1. Code for the actual CPU and Memory - not for the "best-practice", "methodology" or "tech-stack":

• use data-oriented / array-based programming technics
• flat arrays/indexes/intrusive data-structures instead of pointers
• adhere to cache locality/hierarchy
• avoid dependency chains/stalls and enable ILP

dadhi

name	general-dev
description	First-principles software engineering focusing on semantic compression, directness, professionalism.

Development Principles

• Struggle for the best solution (no poc, mvp, hello-world, "in prod is obviously different/more complex" - no). We are professionals btw!
• Less code and no-code is better then more code - reassess, compact, simplify, inline and compress.
• Comment as a fellow technician - not a wordy consultant/marketing person - focus on what and why it does, inout to output transofrmation, surface usage and dependencies

dadhi

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Threading;

public enum NodeType : byte { Sentinel, TwoNode, ThreeNode }

public readonly record struct NodeIdx(int Index, int Gen) {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]

dadhi

1. data-class
2. data-see

dadhi

// source: https://github.com/dotnet/runtime/discussions/115627#discussioncomment-14092390

// Thread.Sleep(0);     // 4750     cede control to any thread of equal priority
// spinWait.SpinOnce(); // 4100     periodically yields (default is 10 iterations)
// Thread.Sleep(1);     // 3900     cede control to any thread of OS choice
// Thread.Yield();      // 3650     cede control to any thread on the same core
// await Task.Delay(0); // 3600     creates and waits on a system timer
// do nothing           // 3600     burn down a CPU core
// Thread.SpinWait(1);  // 3600     duration-limited Yield
// await Task.Yield();  // 3250     suspend task indefinitely (scheduler control)

dadhi

Unrordered:

• Web Frontend JS, SPA, MPA, CQRS/Reactivity == data-star.dev

  Details

  • 30 min talk - https://www.youtube.com/watch?v=0K71AyAF6E4
  • v1 release allows starting from text/html, text/json and go to SSE - https://www.youtube.com/watch?v=u0I7f6NMZvk

• Browser Server interaction == SSE server sent events

dadhi

// Post: https://x.com/VictorTaelin/status/1854326873590792276
// Note: The atomics must be kept.
// Note: This will segfault on non-Apple devices due to upfront mallocs.#include <stdint.h>

#include <stdint.h>
#include <stdatomic.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

dadhi

#!/bin/sh
# rename-pictures.sh
# Author: Justine Tunney <jtunney@gmail.com>
# License: Apache 2.0
#
# This shell script can be used to ensure all the images in a folder
# have good descriptive filenames that are written in English. It's
# based on the Mistral 7b and LLaVA v1.5 models.
#
# For example, the following command:

dadhi

  <PropertyGroup>
    <TargetFrameworks>netcoreapp2.1;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
    <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">net48;$(TargetFrameworks)</TargetFrameworks>
    <IsPackable>false</IsPackable>
    <DefineConstants Condition="'$(TargetFramework)' != 'net48'">$(DefineConstants);READONLYSPAN</DefineConstants>
  </PropertyGroup>

dadhi

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

var list1 = new FixedList<string, Buffer16<string>>();
var list2 = new FixedList<string, Buffer32<string>>();
UseList(ref list1, "Hello");
UseList(ref list2, "World");

Console.WriteLine(list1.GetRef(0));
Console.WriteLine(list2.GetRef(0));