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https://github.com/python/cpython
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f137f75ab8
it deals correctly with some anomalous cases; according to this test
suite I've fixed it right.
The anomalous cases had to do with 'exception' events: these aren't
generated when they would be most helpful, and the profiler has to
work hard to recover the right information. The problems occur when C
code (such as hasattr(), which is used as the example here) calls back
into Python code and clears an exception raised by that Python code.
Consider this example:
def foo():
hasattr(obj, "bar")
Where obj is an instance from a class like this:
class C:
def __getattr__(self, name):
raise AttributeError
The profiler sees the following sequence of events:
call (foo)
call (__getattr__)
exception (in __getattr__)
return (from foo)
Previously, the profiler would assume the return event returned from
__getattr__. An if statement checking for this condition and raising
an exception was commented out... This version does the right thing.
87 lines
2.1 KiB
Python
87 lines
2.1 KiB
Python
"""Test suite for the profile module."""
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import profile
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# In order to have reproducible time, we simulate a timer in the global
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# variable 'ticks', which represents simulated time in milliseconds.
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# (We can't use a helper function increment the timer since it would be
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# included in the profile and would appear to consume all the time.)
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ticks = 0
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def test_main():
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global ticks
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ticks = 0
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prof = profile.Profile(timer)
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prof.runctx("testfunc()", globals(), globals())
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prof.print_stats()
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def timer():
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return ticks*0.001
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def testfunc():
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# 1 call
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# 1000 ticks total: 400 ticks local, 600 ticks in subfunctions
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global ticks
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ticks += 199
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helper() # 300
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helper() # 300
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ticks += 201
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def helper():
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# 2 calls
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# 300 ticks total: 40 ticks local, 260 ticks in subfunctions
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global ticks
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ticks += 1
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helper1() # 30
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ticks += 3
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helper1() # 30
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ticks += 6
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helper2() # 50
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ticks += 5
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helper2() # 50
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ticks += 4
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helper2() # 50
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ticks += 7
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helper2() # 50
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ticks += 14
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def helper1():
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# 4 calls
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# 30 ticks total: 29 ticks local, 1 tick in subfunctions
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global ticks
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ticks += 10
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hasattr(C(), "foo")
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ticks += 19
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def helper2():
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# 8 calls
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# 50 ticks local: 39 ticks local, 11 ticks in subfunctions
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global ticks
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ticks += 11
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hasattr(C(), "bar") # 1
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ticks += 13
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subhelper() # 10
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ticks += 15
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def subhelper():
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# 8 calls
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# 10 ticks total: 8 ticks local, 2 ticks in subfunctions
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global ticks
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ticks += 2
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for i in range(2):
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try:
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C().foo # 1 x 2
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except AttributeError:
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ticks += 3 # 3 x 2
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class C:
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def __getattr__(self, name):
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# 28 calls
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# 1 tick, local
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global ticks
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ticks += 1
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raise AttributeError
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if __name__ == "__main__":
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test_main()
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