>Aren't all three of those languages single-threaded? So the only way to distribute work is to run one copy per core and distribute on a per-request basis? To

>Aren't all three of those languages single-threaded? So the only way to distribute work is to run one copy per core and distribute on a per-request basis? To clarify- languages are never by definition, single threaded. The reference implementations largely are. Some background- in Python's case, PyPy supports STM which removes the global interpreter lock, while retaining backwards compatibility with existing code. The answer to your question is no. All 3 are not single threaded.