FibScale

A Fibonacci number calculator designed to demonstrate horizontal scaling with load balancing.

• Requirements
• Setup
• Run the application
• Configuration

Requirements

• Ruby 3.x

Setup

# Clone the repository
git clone https://github.com/AlphaHydrae/fibscale.git

# Install dependencies
cd fibscale
bundle install

Run the application

Execute the following command in the application's directory:

bundle exec ruby fibscale.rb

Configuration

The FibScale application can take one optional integer argument:

bundle exec ruby fibscale.rb 3

This integer is a worker number and will change the color of the navbar (cycling through a list of seven pre-configured colors). This makes it easy to identify multiple deployed instances.

Further configuration is possible through environment variables:

Environment variable	Default value	Description
FIBSCALE_HOST	0.0.0.0	IP address to listen on (or 0.0.0.0 for any address).
FIBSCALE_PORT	3000	The port the application will listen on.
FIBSCALE_DELAY	0	An optional artificial delay in seconds before returning each result.
FIBSCALE_MAX	10000	The maximum Fibonacci number that can be computed.
FIBSCALE_RECURSIVE_MAX	40	The maximum Fibonacci number that can be computed with the recursive algorithm.