Sidney Radcliffe sradc

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

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

Generate ssh key pairs for accounts and add them to GitHub accounts.

If you haven’t worked with JavaScript in the last few years, these three points should give you enough knowledge to feel comfortable reading the React documentation:

We define variables with let and const statements. For the purposes of the React documentation, you can consider them equivalent to var.
We use the class keyword to define JavaScript classes. There are two things worth remembering about them. Firstly, unlike with objects, you don't need to put commas between class method definitions. Secondly, unlike many other languages with classes, in JavaScript the value of this in a method [depends on how it is called](https://developer.mozilla.org/en-US/docs/Web/Jav

In production, it is recommended to minify any JavaScript code that is included with your application. Minification can help your website load several times faster, especially as the size of your JavaScript source code grows.

Here's one way to set it up:

Install Node.js
Run npm init -y in your project folder (don't skip this step!)
Run npm install terser

Now, to minify a file called like_button.js, run in the terminal:

This is a simplistic setup trying to emulate at least part of i3 behaviour on MacOS using yabai. Key-bindings are partially replicated due to the presence of MacOS built-in bindings

Start with installing (and understanding) following tools

yabai - https://github.com/koekeishiya/yabai
skhd - https://github.com/koekeishiya/skhd
stackline - https://github.com/AdamWagner/stackline

	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

	#!/usr/bin/swift

	// DISCLAIMER

	// This script modifies an unencrypted file associated with the trial version of Final Cut Pro.
	// Under the DMCA (17 U.S.C. § 1201), this modification does not qualify as circumvention of a technological
	// protection measure (TPM), as it does not involve bypassing encryption, authentication, or similar protections.
	// Distributing this code is therefore legal under the DMCA.

	// This script is intended for educational and research purposes, such as exploring trial-related file structures,

	$ git clone [email protected]:xxxxx/xxxx.git my-awesome-proj
	Cloning into 'my-awesome-proj'...
	ssh: connect to host github.com port 22: Connection timed out
	fatal: Could not read from remote repository.

	$ # This should also timeout
	$ ssh -T [email protected]
	ssh: connect to host github.com port 22: Connection timed out

	$ # but this might work

	@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");


	/* Adapted from https://www.reddit.com/r/FirefoxCSS/comments/ao3ydl/configuring_firefox_for_tree_style_tab_usage/ */

	/* hide native tabs and sidebar header */
	#TabsToolbar-customization-target {
	visibility: collapse;
	}

	"""
	Single Responsibility Principle
	“…You had one job” — Loki to Skurge in Thor: Ragnarok
	A class should have only one job.
	If a class has more than one responsibility, it becomes coupled.
	A change to one responsibility results to modification of the other responsibility.
	"""

	class Animal:
	def __init__(self, name: str):