Tingwei tingwei628

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() \

Youtube channels:

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 \

update: I used dockcross instead.

compile .c into aarch64(arm64v8) with ELF format

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

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.

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

Assembly Language / Reversing / Malware Analysis -resources

⭐Assembly Language

Modern x64 Assembly

https://www.youtube.com/playlist?list=PLKK11Ligqitg9MOX3-0tFT1Rmh3uJp7kA

	package main

	import (
	"fmt"
	"reflect"
	)

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

	# 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

	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