If you have a multicore machine -- the only kind of machine that brings a benefit to multithreading -- and if your problem is embarassingly parallel, you can us

If you have a multicore machine -- the only kind of machine that brings a benefit to multithreading -- and if your problem is embarassingly parallel, you can usually get away with multiprocesses (MapReduce etc). That way, your single-threaded process can run on many cores.