Jonathan Melly jonathanMelly

CPU

L1 cache reference 0.5 ns
Branch mispredict 5 ns (on a bad CPU architecture you're pretty much screwed)
L2 cache reference 7 ns
Mutex lock/unlock 25 ns
Main memory reference 100 ns
Compress 1K bytes with Zippy 3,000 ns
Send 2K bytes over 1 Gbps network 20,000 ns
Read 1 MB sequentially from memory 250,000 ns

How to Convert iBook EPUBs to standard EPUBs

iBooks EPUBs actually show up on macOS as folders. If you need the actual file you can use the above script to convert your iBook directory of files to a destination directory.

The path of iBook files as of macOS 10.15.7 is: /Users/${USER}/Library/Mobile Documents/iCloud~com~apple~iBooks/Documents

Usage

Build Emacs with MSYS2

This document is an up-to-date guide on compile Emacs 31 on windows with MSYS2, and make a installation with native compile that can work without MSYS2.

The idea is after get a working Emacs, you may delete MSYS2 environment to free some disk space, and forget about rebuilding Emacs

	#!/bin/bash

	# Set defaults if not provided by environment
	CHECK_DELAY=${CHECK_DELAY:-5}
	CHECK_IP=${CHECK_IP:-8.8.8.8}
	PRIMARY_IF=${PRIMARY_IF:-eth0}
	PRIMARY_GW=${PRIMARY_GW:-1.2.3.4}
	BACKUP_IF=${BACKUP_IF:-eth1}
	BACKUP_GW=${BACKUP_GW:-2.3.4.5}

	#!/usr/bin/env python
	# -- coding: utf-8 --

	# Copyright (c) 2014 Alexey Kutepov a.k.a. rexim

	# Permission is hereby granted, free of charge, to any person
	# obtaining a copy of this software and associated documentation files
	# (the "Software"), to deal in the Software without restriction,
	# including without limitation the rights to use, copy, modify, merge,
	# publish, distribute, sublicense, and/or sell copies of the Software,

	sudo mkdir -m 0700 /var/www/.ssh
	sudo chown -R www-data:www-data /var/www/.ssh
	sudo -u www-data ssh-keygen (empty passphrase)

	# On Github, paste public key into "Deploy keys"

	sudo -u www-data bash
	cd /path/to/repo
	git clone ...

	(defun my/org-link-heading-here (cand)
	(when-let ((marker (get-text-property 0 'consult--candidate cand)))
	(save-excursion
	(with-current-buffer (marker-buffer marker)
	(goto-char marker)
	(org-store-link nil t)))
	(org-insert-all-links 1 "" " ")))
	(defvar-keymap embark-consult-org-heading-map
	:doc "Keymap for operating on org headings"
	:parent embark-general-map

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>My Angular from Scratch</title>
	<style>
	.my-component {
	font-family: Arial, sans-serif;