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Freezing apps with multiprocessing on Windows seems to be broken.
First, in get_command_line in multiprocessing/forking.py I find that
this code:
 if getattr(sys, 'frozen', False):
 return [sys.executable, '--multiprocessing-fork']
 else:
 prog = 'from multiprocessing.forking import main; main()'
 return [_python_exe, '-c', prog, '--multiprocessing-fork']
should be:
 elif getattr(sys, 'frozen', False) and not WINEXE:
 return [sys.executable, '--multiprocessing-fork']
 else:
 prog = 'from multiprocessing.forking import main; main()'
 return [_python_exe, '-c', prog, '--multiprocessing-fork']
in order for the _python_exe set with multiprocessing.set_executable to
be used rather than your app's exe.
Second, I can then get a working "frozen" package if I include
pythonw.exe (and use set_executable to point to it) and a subset of
Python's Lib directory that my process needs to call. If this is as
intended then it needs to be documented. This may just be a flaw in py2exe.
Third, the multiprocessing documentation page description for
set_executable has example code with the older setExecutable call.