Aucker aucker

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

Use proxy in WSL2:rocket:

TL;DR

Every time windows reboots, the IPv4 address will change, FXXK!!!:sweat_smile:

~~In .zshrc or .bashrc file, write the following commands:~~

export HTTP_PROXY=http://xxx.xxx.xxx.xxx:port

I found a better way:

Use Ubuntu WSL instead of XFCE Manjaro:baby:

I have some labs to do so I need a Linux enviroment. However, the XFCE Manjaro has some bugs:

The bustub make file can not run on manjaro/arch linux
The XFCE crashes sometimes
The window manager is so poor

So I choose the Ubuntu 20.04 WSL on Windows10.

Without expectation, there are some things I need to configure.

add a user[optional]

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

`Curl` & `Wget`(●'◡'●)

Curl

Usually, I can curl through the link to get some info.

➜  ~ curl www.google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>

Compiling firefox using the different cpu, perhaps I will add the m1 pro and m1 max benchmark.

AMD Ryzen 7 6800H

ThinkBook 14 G4+ ARA

envs: Windows 11 pro, WSL2, Ubuntu20.04

24:35.31 (suppressed 9 warnings in gfx/cairo)
24:35.31 (suppressed 1 warnings in gfx/graphite2)
24:35.31 (suppressed 23 warnings in gfx/skia)
24:35.31 (suppressed 4 warnings in intl/icu)

Enable `systemd` in WSL 2

This guide will enable systemd to run as normal under WSL 2. This will enable services like microk8s, docker and many more to just work during a WSL session. Note: this was tested on Windows 10 Build 2004, running Ubuntu 20.04 LTS in WSL 2.

To enable systemd under WSL we require a tool called systemd-genie
Copy the contents of install-sg.sh to a new file /tmp/install-sg.sh:
```
cd /tmp
```

I want to add the new built-in function in OpenMLDB, called unhex. The unhex has the following action just like Spark SQL and MySQL.

Spark SQL:

spark-sql> select unhex(hex('Spark SQL'));
Spark SQL
Time taken: 2.163 seconds, Fetched 1 row(s)
spark-sql> select unhex(hex(14));

Time taken: 0.065 seconds, Fetched 1 row(s)

I have a tex template, so I need to install latex on wsl ubuntu.

install the texlive-latex-extra and texlive

sudo apt install texlive-latex-extra texlive

ctexbook.cls not found, install texlive-lang-chinese

sudo apt install texlive-lang-chinese

	#!/bin/bash

	# This installs alacritty terminal on ubuntu (https://github.com/jwilm/alacritty)
	# You have to have rust/cargo installed for this to work

	# Install required tools
	sudo apt-get install -y cmake libfreetype6-dev libfontconfig1-dev xclip

	# Download, compile and install Alacritty
	git clone https://github.com/jwilm/alacritty