Sometimes worth it, but often not. The ability to do shared-memory multi-threading is one of the things that tempts me away from Python. Message passing is gr

Sometimes worth it, but often not. The ability to do shared-memory multi-threading is one of the things that tempts me away from Python. Message passing is great and all, but sometimes you want your messages to be passing around control of a shared 4GB data structure, instead of trying to copy it.