That's good feedback. Although I'm considering mostly distributed systems, where full reproducability is not possible. For single-threaded, deterministic progr

That's good feedback. Although I'm considering mostly distributed systems, where full reproducability is not possible. For single-threaded, deterministic programs (discrete event simulations) where performance is not a measurement point, you can do it with VMs. The nicest thing would be to be able to parameterize experiments. Not just re-run them, but change the parameters for different runs.