> Multithreading on a single CPU doesn't have parallelism. You are just switching between tasks very fast serially. Nitpick: SMT[0] (implemented as Hyper-Threa

> Multithreading on a single CPU doesn't have parallelism. You are just switching between tasks very fast serially. Nitpick: SMT[0] (implemented as Hyper-Threading by Intel) is in fact parallelism for threads on a single CPU. [0]: http://en.wikipedia.org/wiki/Simultaneous_multithreading http://en.wikipedia.org/wiki/Simultaneous_multithreading