Optimization for nano computers

[ygravrand]

I tested steppy on a Raspberry Pi (model A) and on a C.H.I.P ($9).

It launches! But when reacting to midi messages, for example when turning knobs on the Launch Control, the tempo can drift.
The current gevent architecture is based on the assumption that message handling is fast.

We can:

• Try with a multi core computer (e.g. RPi 3): heavy display operations, which already are in a separate process, will execute in a separate core, as intended
  • move all print operations to this separate process, for the same purpose
  • use queues and delegate rules evaluation to another process

Or, if we really want to be able to run it on a C.H.I.P:

• try to optimize things in rules evaluation
• rewrite Steppy in Go :)