jboner

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

vasanthk

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?

waleedahmad

#!/bin/bash

if [[ $EUID -ne 0 ]]; then
   	echo "This script must be run as root" 
   	exit 1
else
	#Update and Upgrade
	echo "Updating and Upgrading"
	apt-get update && sudo apt-get upgrade -y

DomPizzie

Project Title

Simple overview of use/purpose.

Description

An in-depth paragraph about your project and overview of use.

Getting Started