capaplan.rb - basic Ruby/Sinatra app to simulate various types of load common to web applications

NB: This is very early days, mostly up on Github so I can deploy easily to develop it further.

** If you are stumbling across this and think 'urgwtf?', please bear that in mind! **

The basic idea with this is to have an easy-to-call set of operations that will utilise common web application resources:

• CPU
• Memory
• Network IO: frontend upload, download.
• Local disk IO: write, read
• Backend HTTP web services
• SQL databases
• KV stores: memcached, redis
• etc.

From this, hopefully a basic estimate of an application can be made prior to development, to ballpark hardware resource required (or flip-side, existing system capacity)

Using HTTP endpoints allows us to use HTTP load testing toolkits like <http://gatling-tool.com Gatling>

Current endpoints:

• /status -- return 200 OK if all good
• /load/cpu/sha1 -- sha1 some data, to burn CPU consistently
• /load/disk/write?size=n -- write n x 1kb chunks to a local temp file.