ashrithr

Time to generate 1 million hash entries:

• Ruby hash = 3.5 secs
• Redis = 91 secs
• Postgres = 179 secs

Time to lookup 1 million entires in hash:

• Ruby hash = 1.35 seconds
• Redis = 71 secs

ashrithr

package com.cloudwick.hdfs;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

ashrithr

Start server on one machine using:

iperf -s -i 1

• -i specifies the interval at which the output is specified
• -s specified to start server

Start client on another machine using:

ashrithr

Installing required convertors on mac:

1. HandBrake CLI for H.264/AAC/MP4

http://handbrake.fr/downloads2.php

2. ffmpeg for VP8/Vorbis/WebM

ashrithr

Function CreateSheetIf(strSheetName As String) As Boolean
    'Returns false if does not creates a worksheet
    'Returns true if it creates a worksheet

    Dim wsTest As Worksheet
    CreateSheetIf = False
     
    'Check to see if the worksheet exist, if does not exists wsTest will be "Nothing"
    'otherwise wsTest will be assigned to the worksheet
    Set wsTest = Nothing

ashrithr

#!/bin/bash

function usage () {
script=$0
cat <<USAGE
Creates scala project structure to be used with sbt

Syntax
`basename $script` project_name artifact_id

ashrithr

Storm

Storm is a distributed and fault-tolerant realtime computation system

###Features of storm:

• Scalable and robust
• Fault-tolrant (automatic reassigning of tasks)
• Reliable (all messages are processed at least once)
• Fast

ashrithr

Sinatra

Installation:

Dependencies: ruby

gem install sinatra

ashrithr

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

ashrithr

##Install keydown:

gem install keydown

##Generate Template

keydown generate demo_presentation