Siva byteshiva

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

WebAssembly kickstart guide

Rolling your own compiler

One of the premises of WebAssembly is to support compiling multiple languages to WebAssembly.

C/C++

Building

via: http://www.webupd8.org/2011/05/install-firefox-nightly-from-ubuntu-ppa.html

Add the Mozilla Daily PPA (available for Ubuntu 11.04, 10.10 and 10.04) and install Firefox Nightly using the commands below:

$ [sudo] add-apt-repository ppa:ubuntu-mozilla-daily/ppa
$ [sudo] apt-get update
$ [sudo] apt-get install firefox-trunk

Since this is a daily builds PPA, it's nowhere near stable so use it at your own risk!

	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

	### JHW 2018
	import numpy as np
	import umap



	# This code from the excellent module at:
	# https://stackoverflow.com/questions/4643647/fast-prime-factorization-module

	import random

	<html>
	<head>
	<title>DevTools Test</title>
	</head>
	<body>
	<script>
	if ('serviceWorker' in navigator) {
	navigator.serviceWorker.register('sw.js');
	// Wait until the SW has taken control of the page before inserting the <script> elements.
	// That way we can be sure the SW's fetch handler will intercept them.

	{
	"firebase": "my-awesome-app",
	"rewrites": [ {
	"source": "**",
	"destination": "/index.html"
	} ],
	"headers": [ {
	"source" : "*/.html",
	"headers" : [ {
	"key" : "Cache-Control",

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>combineLatest</title>
	<script src="https://npmcdn.com/@reactivex/[email protected]/dist/global/Rx.umd.js"></script>
	</head>
	<body>
	<div>