The article describes how to effectively dispatch hundreds of thousands of ride requests per hour, with thousands of cabs. Not only which cab should pick up which passenger, but which passengers should share a ride and what is the best pick-up and drop-off order. An automatic dispatching process has been implemented to verify feasibility of such cab sharing solution, simulation was used to check quality of routes. Performance of different programming tools and frameworks has been tested. Thousands of passengers per minute could be dispatched with basic algorithms and simple hardware and they can be dispatched in a cab sharing scheme very effectively, at least 11 passengers per cab per hour. The spotlight is on practical aspects, not well-known theory. The goal is to verify feasibility of a large-scale dispatcher and to give its benchmark. Implementation of algorithms including a dispatcher and simulation environment is available as open source on GitHub.