Maksim Titiaiev Titiaiev

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

	#!/bin/bash

	# создаёт новый nodejs typescript
	# настраивает eslint, prettier, nodemon, устанавливает рабочие зависимости
	# инициализирует гит репозиторий и делает инит комит

	echo "(Будет использовано для name в package.json и создания директории проекта)"
	echo -n "Введите название проекта: "
	read PROJECT_NAME

	{
	"printWidth": 100,
	"tabWidth": 2,
	"useTabs": false,
	"semi": true,
	"singleQuote": true,
	"trailingComma": "all",
	"bracketSpacing": true,
	"jsxBracketSameLine": false,
	"arrowParens": "avoid",

	#! /bin/bash
	wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc \| sudo apt-key add - \
	&& touch /etc/apt/sources.list.d/mongodb-org-4.4.list \
	&& echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" \| sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list \
	&& sudo apt-get update \
	&& sudo apt-get install -y mongodb-org \
	&& sudo mkdir /var/lib/mongodb /var/log/mongodb /var/run/mongodb \
	&& sudo chown -R mongodb:mongodb /var/lib/mongodb /var/log/mongodb /var/run/mongodb \
	&& sudo touch /etc/mongod.conf \
	&& sudo wget https://gist.githubusercontent.com/Titiaiev/5af58cf194f5412665f201e40f6668b9/raw/98dd724c349e46cab521a5e626fa8247019b6a87/mongod.conf > /etc/mongod.conf \

	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

	#!/bin/bash
	DIVIDER="====================================="
	USER_CHROM_PROFILE_DIRNAME=".chrome_user_profile"
	IGNORE=".gitignore"


	echo "Хотите запустить инициализацию нового проект? (yes/no)"
	read AGREE
	echo "$DIVIDER"

	#!/usr/bin/env node
	const {exec} = require('child_process');
	const process = require('process');
	const USER_CHROM_PROFILE_DIRNAME = "./chrome_user_profile";
	const URLs_FOR_OPEN = ['google.com', 'nodejs.org'];
	var gfg;
	// # запуск хрома без гуи для удаленного дебага
	// #chrome --headless --remote-debugging-port=9222 https://chromium.org

	// список интересных флагов для хрома

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>React app</title>
	</head>
	<body>

	// для теста
	// const str = 'ПГПГ ПЮОГ УГПЦ';
	// расшифровывается в "мама мыла раму"
	const caesarCipher = function caesarCipher(string) {
	const codesMap = {
	а: 1,
	б: 2,
	в: 3,
	г: 4,
	д: 5,

	{
	"extends": [ "airbnb-base" ],
	"parser": "babel-eslint",
	"plugins": [],
	"env": {
	"amd": true,
	"browser": true,
	"jquery": true,
	"node": true,
	"es6": true,