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gh-158985: Make profile and cProfile -m run the module as __main__ - #158992
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sricursion wants to merge 1 commit into
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Pass alter_sys=True to runpy.run_module() in the -m branch of profile and profiling.tracing, so that sys.modules['__main__'] and sys.argv[0] refer to the profiled module, as with python -m.
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python -m cProfile -m MODULEandpython -m profile -m MODULErun the module withrunpy.run_module()and its defaultalter_sys=False, sosys.modules['__main__']stays the profiler module andsys.argv[0]is the bare module name. Objects defined in the profiled module then cannot be pickled, which breaksProcessPoolExecutorandmultiprocessingwith thespawnstart method. Profiling a script path was fixed in gh-132737 and gh-140729, but the-mbranch was not changed. This passesalter_sys=Trueinprofile.main()andprofiling.tracing.main(), so the module runs as__main__withsys.argv[0]set to its path, as underpython -m. The regression test is added toProfileTest, so it also runs forprofiling.tracingthroughCProfileTest.