dblock/heroku-commander — pull request #6 by mzikherman (2013-04-16 19:14:40+00:00)
Title: @dblock => Add size=2x to the command line when you specify size

https://devcenter.heroku.com/articles/dyno-size

It looks like the syntax is '$ heroku run --size=2X rake heavy:job'. Just specifying --size 2x gives a syntax error.