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"""Test suite for the cProfile module."""
import cProfile, pstats, sys
# In order to have reproducible time, we simulate a timer in the global
# variable 'ticks', which represents simulated time in milliseconds.
# (We can't use a helper function increment the timer since it would be
# included in the profile and would appear to consume all the time.)
ticks = 0
# IMPORTANT: this is an output test. *ALL* NUMBERS in the expected
# output are relevant. If you change the formatting of pstats,
# please don't just regenerate output/test_cProfile without checking
# very carefully that not a single number has changed.
def test_main():
global ticks
ticks = 42000
prof = cProfile.Profile(timer, 0.001)
prof.runctx("testfunc()", globals(), locals())
assert ticks == 43000, ticks
st = pstats.Stats(prof)
st.strip_dirs().sort_stats('stdname').print_stats()
st.print_callees()
st.print_callers()
def timer():
return ticks
def testfunc():
# 1 call
# 1000 ticks total: 270 ticks local, 730 ticks in subfunctions
global ticks
ticks += 99
helper() # 300
helper() # 300
ticks += 171
factorial(14) # 130
def factorial(n):
# 23 calls total
# 170 ticks total, 150 ticks local
# 3 primitive calls, 130, 20 and 20 ticks total
# including 116, 17, 17 ticks local
global ticks
if n > 0:
ticks += n
return mul(n, factorial(n-1))
else:
ticks += 11
return 1
def mul(a, b):
# 20 calls
# 1 tick, local
global ticks
ticks += 1
return a * b
def helper():
# 2 calls
# 300 ticks total: 20 ticks local, 260 ticks in subfunctions
global ticks
ticks += 1
helper1() # 30
ticks += 2
helper1() # 30
ticks += 6
helper2() # 50
ticks += 3
helper2() # 50
ticks += 2
helper2() # 50
ticks += 5
helper2_indirect() # 70
ticks += 1
def helper1():
# 4 calls
# 30 ticks total: 29 ticks local, 1 tick in subfunctions
global ticks
ticks += 10
hasattr(C(), "foo") # 1
ticks += 19
lst = []
lst.append(42) # 0
sys.exc_info() # 0
def helper2_indirect():
helper2() # 50
factorial(3) # 20
def helper2():
# 8 calls
# 50 ticks local: 39 ticks local, 11 ticks in subfunctions
global ticks
ticks += 11
hasattr(C(), "bar") # 1
ticks += 13
subhelper() # 10
ticks += 15
def subhelper():
# 8 calls
# 10 ticks total: 8 ticks local, 2 ticks in subfunctions
global ticks
ticks += 2
for i in range(2): # 0
try:
C().foo # 1 x 2
except AttributeError:
ticks += 3 # 3 x 2
class C:
def __getattr__(self, name):
# 28 calls
# 1 tick, local
global ticks
ticks += 1
raise AttributeError
if __name__ == "__main__":
test_main()
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