There are debuggers that nicely handle real-time with "many threads, many hosts, many replicas of the same service". If you don't mind paying, Concurrent has s

There are debuggers that nicely handle real-time with "many threads, many hosts, many replicas of the same service". If you don't mind paying, Concurrent has stuff for it: NightView, NightSim, NightTrace https://www.youtube.com/user/ConcurrentRealTime/videos https://www.youtube.com/user/ConcurrentRealTime/videos Other approaches include whole-system emulation, digital logic analyzers, and SystemTap.