Cloud Foundry Demo

Objective

The purpose of this demo is to investigate scalability of CPU intencive application in Cloud Foundry environment.

Description

fib-java is a simple Java Servlet that calculates N-th Fibonacci number. The calculation uses CPU intencive algorythm.

The Git repository includes

• source code;
• Maven build script;
• precompiled war file; and
• Cloud Foundry deployment manifest

Usage

Deployment to Cloud Foundry

1. Update manifest.yml. Replace fib-java with a unique application name to avoid URL naming collisions.
2. Use cf tool to deploy the app.

   cf push
   

Servlet usage

Without any additional parameters the servlet returns 40-th Fibonacci number in HTML page. Open application url in a browser to see the result:

Fibonacci number 40 is 102334155

The application accepts one parameter "n" for N-th Fibonacci number. THe default value is 40. Example: to get 30-th number use http://fib-java.poc.platform.comcast.net/?n=30

Apache HTTP benchmarking

Run basic Apache benchmarking test

ab -n 40 -c 8 http://fib-java.poc.platform.comcast.net/?n=40

Scale up the application and repeat the same test. Compare mean time per request between tests with different scaling factors.

cf scale fib-java -i 8

Building application from the source

Run Maven package

mvn package