return self._calibrate_inner(m, verbose)

[500] Fix | Delete

finally:

[501] Fix | Delete

self.bias = saved_bias

[502] Fix | Delete

[503] Fix | Delete

def _calibrate_inner(self, m, verbose):

[504] Fix | Delete

get_time = self.get_time

[505] Fix | Delete

[506] Fix | Delete

# Set up a test case to be run with and without profiling. Include

[507] Fix | Delete

# lots of calls, because we're trying to quantify stopwatch overhead.

[508] Fix | Delete

# Do not raise any exceptions, though, because we want to know

[509] Fix | Delete

# exactly how many profile events are generated (one call event, +

[510] Fix | Delete

# one return event, per Python-level call).

[511] Fix | Delete

[512] Fix | Delete

def f1(n):

[513] Fix | Delete

for i in range(n):

[514] Fix | Delete

x = 1

[515] Fix | Delete

[516] Fix | Delete

def f(m, f1=f1):

[517] Fix | Delete

for i in range(m):

[518] Fix | Delete

f1(100)

[519] Fix | Delete

[520] Fix | Delete

f(m) # warm up the cache

[521] Fix | Delete

[522] Fix | Delete

# elapsed_noprofile <- time f(m) takes without profiling.

[523] Fix | Delete

t0 = get_time()

[524] Fix | Delete

f(m)

[525] Fix | Delete

t1 = get_time()

[526] Fix | Delete

elapsed_noprofile = t1 - t0

[527] Fix | Delete

if verbose:

[528] Fix | Delete

print("elapsed time without profiling =", elapsed_noprofile)

[529] Fix | Delete

[530] Fix | Delete

# elapsed_profile <- time f(m) takes with profiling. The difference

[531] Fix | Delete

# is profiling overhead, only some of which the profiler subtracts

[532] Fix | Delete

# out on its own.

[533] Fix | Delete

p = Profile()

[534] Fix | Delete

t0 = get_time()

[535] Fix | Delete

p.runctx('f(m)', globals(), locals())

[536] Fix | Delete

t1 = get_time()

[537] Fix | Delete

elapsed_profile = t1 - t0

[538] Fix | Delete

if verbose:

[539] Fix | Delete

print("elapsed time with profiling =", elapsed_profile)

[540] Fix | Delete

[541] Fix | Delete

# reported_time <- "CPU seconds" the profiler charged to f and f1.

[542] Fix | Delete

total_calls = 0.0

[543] Fix | Delete

reported_time = 0.0

[544] Fix | Delete

for (filename, line, funcname), (cc, ns, tt, ct, callers) in \

[545] Fix | Delete

p.timings.items():

[546] Fix | Delete

if funcname in ("f", "f1"):

[547] Fix | Delete

total_calls += cc

[548] Fix | Delete

reported_time += tt

[549] Fix | Delete

[550] Fix | Delete

if verbose:

[551] Fix | Delete

print("'CPU seconds' profiler reported =", reported_time)

[552] Fix | Delete

print("total # calls =", total_calls)

[553] Fix | Delete

if total_calls != m + 1:

[554] Fix | Delete

raise ValueError("internal error: total calls = %d" % total_calls)

[555] Fix | Delete

[556] Fix | Delete

# reported_time - elapsed_noprofile = overhead the profiler wasn't

[557] Fix | Delete

# able to measure. Divide by twice the number of calls (since there

[558] Fix | Delete

# are two profiler events per call in this test) to get the hidden

[559] Fix | Delete

# overhead per event.

[560] Fix | Delete

mean = (reported_time - elapsed_noprofile) / 2.0 / total_calls

[561] Fix | Delete

if verbose:

[562] Fix | Delete

print("mean stopwatch overhead per profile event =", mean)

[563] Fix | Delete

return mean

[564] Fix | Delete

[565] Fix | Delete

#****************************************************************************

[566] Fix | Delete

[567] Fix | Delete

def main():

[568] Fix | Delete

import os

[569] Fix | Delete

from optparse import OptionParser

[570] Fix | Delete

[571] Fix | Delete

usage = "profile.py [-o output_file_path] [-s sort] [-m module | scriptfile] [arg] ..."

[572] Fix | Delete

parser = OptionParser(usage=usage)

[573] Fix | Delete

parser.allow_interspersed_args = False

[574] Fix | Delete

parser.add_option('-o', '--outfile', dest="outfile",

[575] Fix | Delete

help="Save stats to <outfile>", default=None)

[576] Fix | Delete

parser.add_option('-m', dest="module", action="store_true",

[577] Fix | Delete

help="Profile a library module.", default=False)

[578] Fix | Delete

parser.add_option('-s', '--sort', dest="sort",

[579] Fix | Delete

help="Sort order when printing to stdout, based on pstats.Stats class",

[580] Fix | Delete

default=-1)

[581] Fix | Delete

[582] Fix | Delete

if not sys.argv[1:]:

[583] Fix | Delete

parser.print_usage()

[584] Fix | Delete

sys.exit(2)

[585] Fix | Delete

[586] Fix | Delete

(options, args) = parser.parse_args()

[587] Fix | Delete

sys.argv[:] = args

[588] Fix | Delete

[589] Fix | Delete

# The script that we're profiling may chdir, so capture the absolute path

[590] Fix | Delete

# to the output file at startup.

[591] Fix | Delete

if options.outfile is not None:

[592] Fix | Delete

options.outfile = os.path.abspath(options.outfile)

[593] Fix | Delete

[594] Fix | Delete

if len(args) > 0:

[595] Fix | Delete

if options.module:

[596] Fix | Delete

import runpy

[597] Fix | Delete

code = "run_module(modname, run_name='__main__')"

[598] Fix | Delete

globs = {

[599] Fix | Delete

'run_module': runpy.run_module,

[600] Fix | Delete

'modname': args[0]

[601] Fix | Delete

}

[602] Fix | Delete

else:

[603] Fix | Delete

progname = args[0]

[604] Fix | Delete

sys.path.insert(0, os.path.dirname(progname))

[605] Fix | Delete

with io.open_code(progname) as fp:

[606] Fix | Delete

code = compile(fp.read(), progname, 'exec')

[607] Fix | Delete

globs = {

[608] Fix | Delete

'__file__': progname,

[609] Fix | Delete

'__name__': '__main__',

[610] Fix | Delete

'__package__': None,

[611] Fix | Delete

'__cached__': None,

[612] Fix | Delete

}

[613] Fix | Delete

try:

[614] Fix | Delete

runctx(code, globs, None, options.outfile, options.sort)

[615] Fix | Delete

except BrokenPipeError as exc:

[616] Fix | Delete

# Prevent "Exception ignored" during interpreter shutdown.

[617] Fix | Delete

sys.stdout = None

[618] Fix | Delete

sys.exit(exc.errno)

[619] Fix | Delete

else:

[620] Fix | Delete

parser.print_usage()

[621] Fix | Delete

return parser

[622] Fix | Delete

[623] Fix | Delete

# When invoked as main program, invoke the profiler on a script

[624] Fix | Delete

if __name__ == '__main__':

[625] Fix | Delete

main()

[626] Fix | Delete

[627] Fix | Delete