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@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 13:16 — forked from jboner/latency.txt
Latency numbers every programmer should know

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

@kaizhu256
kaizhu256 / gist:2853704
Created June 1, 2012 17:11
javascript uuid4 generator
my.uuid4 = function() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, my._uuid4);
};
//// OPTIMIZATION - cache callback
my._uuid4 = function(cc) {
var rr = Math.random() * 16 | 0; return (cc === 'x' ? rr : (rr & 0x3 | 0x8)).toString(16);
};
@ksafranski
ksafranski / expecting.md
Last active November 11, 2023 23:00
Basic principles of using tcl-expect scripts

Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect
@agrueneberg
agrueneberg / client.html
Last active March 19, 2023 06:48
HMAC-SHA256 example for verifying both the data integrity and the authentication of a request in Node.js and web browsers.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>HMAC-SHA256 Example</title>
</head>
<body>
<script src="http://crypto.stanford.edu/sjcl/sjcl.js"></script>
<script>
var sharedSecret, query, signature, hmac, xhr;
@fritzy
fritzy / spinner.js
Last active July 18, 2022 11:03
Use Mutation Observers to place image placeholders (spinners) on loading images within a target element.
//whenever uncached images are added to the dom tree within target,
//replace them with a spinner gif until they're loaded
function replaceImages(target, spinner_src) {
var spinner, observer;
//detect support
if (window.MutationObserver) {
//preload spinner (probably a gif)
//if it's not ready for first use, oh well
spinner = new Image();
@tompazourek
tompazourek / feathericons.less
Last active February 2, 2019 23:34
Feather icons (http://colebemis.com/feather/) for Bootstrap
@charset "UTF-8";
@font-face {
font-family: "feather";
src: ~"url('@{icon-font-path}feather-webfont.eot')";
src: ~"url('@{icon-font-path}feather-webfont.eot?#iefix') format('embedded-opentype')",
~"url('@{icon-font-path}feather-webfont.woff') format('woff')",
~"url('@{icon-font-path}feather-webfont.ttf') format('truetype')",
~"url('@{icon-font-path}feather-webfont.svg#featherregular') format('svg')";
font-weight: normal;
@nicolasembleton
nicolasembleton / restart_bluetooth.sh
Last active May 11, 2024 17:43
Restart Bluetooth Daemon on Mac OS X without restarting
#!/bin/bash
sudo kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
sudo kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
@JamesMessinger
JamesMessinger / IndexedDB101.js
Last active May 19, 2024 18:56
Very Simple IndexedDB Example
// This works on all devices/browsers, and uses IndexedDBShim as a final fallback
var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;
// Open (or create) the database
var open = indexedDB.open("MyDatabase", 1);
// Create the schema
open.onupgradeneeded = function() {
var db = open.result;
var store = db.createObjectStore("MyObjectStore", {keyPath: "id"});
@ilyaigpetrov
ilyaigpetrov / report-asp.net-vs-node.js-for-backend-comparison.md
Last active May 27, 2024 12:21
ASP.NET vs Node.js for Backend Programming | by https://git.io/ilyaigpetrov

Comparison of ASP.NET and Node.js for Backend Programming

We will compare ASP.NET and Node.js for backend programming.
Source codes from examples.

Updates

This document was published on 21.09.2015 for a freelance employer. Some changes since then (14.02.2016):

  1. Koa.js no longer uses co-routines, it has switched to Babel's async/await. yield and await are used almost in the same way, so I see no point to rewrite the examples.
@pjobson
pjobson / plex_media_permissions_4_noobies.md
Last active April 21, 2024 21:37
Plex Media Permissions for Linux Noobies

Plex Media Permissions for Linux Noobies

There is no problem with being a noobie and I do not use the term to sligtht or disparage anyone.

This is a way to setup your permissions for running Plex in Linux. Different folks may use different methods.

The permissions concepts provided here apply to OSX, but the users and groups are controlled and modified differently, so much of this will not work properly. I think the command is dscl, but that could be out of date.

There are many ways to setup your permissions scheme in Linux, this methodology describes a way to do it, not everyone will like it, but it works for me, so whatever.