Well if you were planning on having an instance run for a long time, and it's a CPU bound process, then it would definitely be worth experimenting with a roulet

Well if you were planning on having an instance run for a long time, and it's a CPU bound process, then it would definitely be worth experimenting with a roulette system. Some people already do this for EBS disk I/O issues, you fire up an instance, run some sample benchmarks, and kill the instance if it's a problematic one.