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package main

import (
  "fmt"
  "reflect"
)

// Name of the struct tag used in examples
const tagName = "validate"

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# Step 1: target at versions you want to delete
# Step 2: chmod +x delete_dotnet_core.sh
# Step 3: ./delete_dotnet_core.sh

# Target sdks to remove
declare -a sdkVersions=("3.0.101" "3.1.401")
for sdkVersion in "${sdkVersions[@]}"
do
    sudo rm -rf /usr/local/share/dotnet/sdk/$sdkVersion
    # sudo rm -rf /usr/local/share/dotnet/sdk-manifests/$sdkVersion

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From this tweet
Q: The fastest way to read a text file line by line

47Gb file -> 5hrs
Console.Write each loop -> 45 mins to read the file (.NET 6)

別人用BenchmarkDotnet寫好的測試範例

1.File.ReadLines() \

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Getting Started With Kubernetes On A High Level

One of biggest barriers when trying to get started with Kubernetes is that there's so much content out there that it's kinda overwhelming - and that's totally normal! The intent of this document is to try and provide directed resources in a roadmap like fashion to understand and learn about the horizontals of Kubernetes - post which you can dive deep into any vertical while keeping the bigger picture in mind - that this document hopes to provide.

This is a set of resources for different topics that I found particularly helpful when getting started, and hopefully you do too! I've tried to list them out in order of consumption. If A comes before B under a subtopic, then it's probably that A has topics needed for B, or that A attempts to explain topics of B in a slightly simpler (not nescessarily better) manner than B.

Containers

Feel free to skip over if you're already familiar with containers and have some idea about what they are and why they exist.

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Youtube channels:

1. Gaurav Sen
2. Rachit Jain
3. Akshay Saini
4. Tushar Roy
5. mycodeschool
6. Saurabh School
7. Keerthi Purswani
8. Nick White
9. Back To Back SWE

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Backend

IR -> IR Optimization -> Code Generation(Register allocation/Instruction selection) Assembly

Code generation

1.top-of-stack caching (1-TOSCA)
2.init garbage collector

Object layout

1.similar to C++ inheritance \

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update: I used dockcross instead.

compile .c into aarch64(arm64v8) with ELF format

brew tap SergioBenitez/osxct
brew install aarch64-none-elf

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Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

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Getting started with Linux kernel development

Prerequisites

The Linux kernel is written in C, so you should have at least a basic understanding of C before diving into kernel work. You don't need expert level C knowledge, since you can always pick some things up underway, but it certainly helps to know the language and to have written some userspace C programs already.

It will also help to be a Linux user. If you have never used Linux before, it's probably a good idea to download a distro and get comfortable with it before you start doing kernel work.

Lastly, knowing git is not actually required, but can really help you (since you can dig through changelogs and search for information you'll need). At a minimum you should probably be able to clone the git repository to a local directory.

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Env: macOS Catalina 10.15.7

Step1: git clone --recursive https://github.com/riscv/riscv-gnu-toolchain

Although it doesn't need --recursive in README, this issue still happened on mac.

Step2: brew install python3 gawk gnu-sed gmp mpfr libmpc isl zlib expat

Step3: cd riscv-gnu-toolchain directory and ./configure --prefix=/opt/riscv --enable-multilib

To build either cross-compiler with support for both 32-bit and 64-bit