We're running on Windows, and fork isn't available there. Also, in this case AFAIK fork doesn't really apply, as we wanted to start the C++ and Python servers completely separately.
It's quite easy to release the GIL while you are running non-python code.[1] Just be sure that if you touch the Python API that you reaquire the GIL.[2]
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[ 6.8 ms ] story [ 35.3 ms ] thread[1] http://docs.python.org/c-api/init.html#releasing-the-gil-fro...
[2] http://docs.python.org/c-api/init.html#PyGILState_Ensure