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@vasanthk
vasanthk / System Design.md
Last active Aug 7, 2020
System Design Cheatsheet
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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

  1. Clarify and agree on the scope of the system
  • User cases (description of sequences of events that, taken together, lead to a system doing something useful)
    • Who is going to use it?
    • How are they going to use it?
@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 — forked from jboner/latency.txt
Latency numbers every programmer should know
View latency.markdown

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
@debasishg
debasishg / gist:8172796
Last active Aug 6, 2020
A collection of links for streaming algorithms and data structures
View gist:8172796
  1. General Background and Overview
@faithfracture
faithfracture / boost.sh
Last active Jul 31, 2020
Boost build script for iOS (armv7, armv7s, arm64), iOS Simulator (i386, x86_64), and OSX (i386, x86_64)
View boost.sh
#===============================================================================
# Filename: boost.sh
# Author: Pete Goodliffe
# Copyright: (c) Copyright 2009 Pete Goodliffe
# Licence: Please feel free to use this, with attribution
# Modified version
#===============================================================================
#
# Builds a Boost framework for iOS, iOS Simulator, and OSX.
# Creates a set of universal libraries that can be used on an iOS and in the
@addyosmani
addyosmani / package.json
Last active Jul 29, 2020
npm run-scripts boilerplate
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{
"name": "my-app",
"version": "1.0.0",
"description": "My test app",
"main": "src/js/index.js",
"scripts": {
"jshint:dist": "jshint src/js/*.js",
"jshint": "npm run jshint:dist",
"jscs": "jscs src/*.js",
"browserify": "browserify -s Validating -o ./dist/js/build.js ./lib/index.js",
View bling.js
/* bling.js */
window.$ = document.querySelectorAll.bind(document);
Node.prototype.on = window.on = function (name, fn) {
this.addEventListener(name, fn);
}
NodeList.prototype.__proto__ = Array.prototype;
@mikhailov
mikhailov / 0. nginx_setup.sh
Last active Jul 7, 2020
NGINX+SPDY with Unicorn. True Zero-Downtime unless migrations. Best practices.
View 0. nginx_setup.sh
# Nginx+Unicorn best-practices congifuration guide. Heartbleed fixed.
# We use latest stable nginx with fresh **openssl**, **zlib** and **pcre** dependencies.
# Some extra handy modules to use: --with-http_stub_status_module --with-http_gzip_static_module
#
# Deployment structure
#
# SERVER:
# /etc/init.d/nginx (1. nginx)
# /home/app/public_html/app_production/current (Capistrano directory)
#
@dhh
dhh / Basecamp-DDOS.md
Last active Jun 28, 2020
Basecamp is under network attack (DDoS)
View Basecamp-DDOS.md

Basecamp was under network attack

The attack detailed below has stopped (for the time being) and almost all network access for almost all customers have been restored. We're keeping this post and the timeline intact for posterity. Unless the attack resumes, we'll post a complete postmortem within 48 hours (so before Wednesday, March 26 at 11:00am central time).

Criminals have laid siege to our networks using what's called a distributed denial-of-service attack (DDoS) starting at 8:46 central time, March 24 2014. The goal is to make Basecamp, and the rest of our services, unavailable by flooding the network with bogus requests, so nothing legitimate can come through. This attack was launched together with a blackmail attempt that sought to have us pay to avoid this assault.

Note that this attack targets the network link between our servers and the internet. All the data is safe and sound, but nobody is able to get to it as long as the attack is being successfully executed. This is like a bunch of people

@traviskaufman
traviskaufman / jasmine-this-vars.md
Last active Jun 12, 2020
Better Jasmine Tests With `this`
View jasmine-this-vars.md

Better Jasmine Tests With this

On the Refinery29 Mobile Web Team, codenamed "Bicycle", all of our unit tests are written using Jasmine, an awesome BDD library written by Pivotal Labs. We recently switched how we set up data for tests from declaring and assigning to closures, to assigning properties to each test case's this object, and we've seen some awesome benefits from doing such.

The old way

Up until recently, a typical unit test for us looked something like this:

describe('views.Card', function() {
@alexfu
alexfu / DividerItemDecoration.java
Last active Jun 1, 2020
An ItemDecoration that draws dividers between items. Pulled from Android support demos.
View DividerItemDecoration.java
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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