266 lines
8.2 KiB
Python
266 lines
8.2 KiB
Python
|
# testing/profiling.py
|
||
|
|
# Copyright (C) 2005-2018 the SQLAlchemy authors and contributors
|
||
|
|
# <see AUTHORS file>
|
||
|
|
#
|
||
|
|
# This module is part of SQLAlchemy and is released under
|
||
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
||
|
|
|
||
|
|
"""Profiling support for unit and performance tests.
|
||
|
|
|
||
|
|
These are special purpose profiling methods which operate
|
||
|
|
in a more fine-grained way than nose's profiling plugin.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
import os
|
||
|
|
import sys
|
||
|
|
from .util import gc_collect
|
||
|
|
from . import config
|
||
|
|
import pstats
|
||
|
|
import collections
|
||
|
|
import contextlib
|
||
|
|
|
||
|
|
try:
|
||
|
|
import cProfile
|
||
|
|
except ImportError:
|
||
|
|
cProfile = None
|
||
|
|
from ..util import jython, pypy, win32, update_wrapper
|
||
|
|
|
||
|
|
_current_test = None
|
||
|
|
|
||
|
|
# ProfileStatsFile instance, set up in plugin_base
|
||
|
|
_profile_stats = None
|
||
|
|
|
||
|
|
|
||
|
|
class ProfileStatsFile(object):
|
||
|
|
""""Store per-platform/fn profiling results in a file.
|
||
|
|
|
||
|
|
We're still targeting Py2.5, 2.4 on 0.7 with no dependencies,
|
||
|
|
so no json lib :( need to roll something silly
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, filename):
|
||
|
|
self.force_write = (
|
||
|
|
config.options is not None and
|
||
|
|
config.options.force_write_profiles
|
||
|
|
)
|
||
|
|
self.write = self.force_write or (
|
||
|
|
config.options is not None and
|
||
|
|
config.options.write_profiles
|
||
|
|
)
|
||
|
|
self.fname = os.path.abspath(filename)
|
||
|
|
self.short_fname = os.path.split(self.fname)[-1]
|
||
|
|
self.data = collections.defaultdict(
|
||
|
|
lambda: collections.defaultdict(dict))
|
||
|
|
self._read()
|
||
|
|
if self.write:
|
||
|
|
# rewrite for the case where features changed,
|
||
|
|
# etc.
|
||
|
|
self._write()
|
||
|
|
|
||
|
|
@property
|
||
|
|
def platform_key(self):
|
||
|
|
|
||
|
|
dbapi_key = config.db.name + "_" + config.db.driver
|
||
|
|
|
||
|
|
# keep it at 2.7, 3.1, 3.2, etc. for now.
|
||
|
|
py_version = '.'.join([str(v) for v in sys.version_info[0:2]])
|
||
|
|
|
||
|
|
platform_tokens = [py_version]
|
||
|
|
platform_tokens.append(dbapi_key)
|
||
|
|
if jython:
|
||
|
|
platform_tokens.append("jython")
|
||
|
|
if pypy:
|
||
|
|
platform_tokens.append("pypy")
|
||
|
|
if win32:
|
||
|
|
platform_tokens.append("win")
|
||
|
|
platform_tokens.append(
|
||
|
|
"nativeunicode"
|
||
|
|
if config.db.dialect.convert_unicode
|
||
|
|
else "dbapiunicode"
|
||
|
|
)
|
||
|
|
_has_cext = config.requirements._has_cextensions()
|
||
|
|
platform_tokens.append(_has_cext and "cextensions" or "nocextensions")
|
||
|
|
return "_".join(platform_tokens)
|
||
|
|
|
||
|
|
def has_stats(self):
|
||
|
|
test_key = _current_test
|
||
|
|
return (
|
||
|
|
test_key in self.data and
|
||
|
|
self.platform_key in self.data[test_key]
|
||
|
|
)
|
||
|
|
|
||
|
|
def result(self, callcount):
|
||
|
|
test_key = _current_test
|
||
|
|
per_fn = self.data[test_key]
|
||
|
|
per_platform = per_fn[self.platform_key]
|
||
|
|
|
||
|
|
if 'counts' not in per_platform:
|
||
|
|
per_platform['counts'] = counts = []
|
||
|
|
else:
|
||
|
|
counts = per_platform['counts']
|
||
|
|
|
||
|
|
if 'current_count' not in per_platform:
|
||
|
|
per_platform['current_count'] = current_count = 0
|
||
|
|
else:
|
||
|
|
current_count = per_platform['current_count']
|
||
|
|
|
||
|
|
has_count = len(counts) > current_count
|
||
|
|
|
||
|
|
if not has_count:
|
||
|
|
counts.append(callcount)
|
||
|
|
if self.write:
|
||
|
|
self._write()
|
||
|
|
result = None
|
||
|
|
else:
|
||
|
|
result = per_platform['lineno'], counts[current_count]
|
||
|
|
per_platform['current_count'] += 1
|
||
|
|
return result
|
||
|
|
|
||
|
|
def replace(self, callcount):
|
||
|
|
test_key = _current_test
|
||
|
|
per_fn = self.data[test_key]
|
||
|
|
per_platform = per_fn[self.platform_key]
|
||
|
|
counts = per_platform['counts']
|
||
|
|
current_count = per_platform['current_count']
|
||
|
|
if current_count < len(counts):
|
||
|
|
counts[current_count - 1] = callcount
|
||
|
|
else:
|
||
|
|
counts[-1] = callcount
|
||
|
|
if self.write:
|
||
|
|
self._write()
|
||
|
|
|
||
|
|
def _header(self):
|
||
|
|
return (
|
||
|
|
"# %s\n"
|
||
|
|
"# This file is written out on a per-environment basis.\n"
|
||
|
|
"# For each test in aaa_profiling, the corresponding "
|
||
|
|
"function and \n"
|
||
|
|
"# environment is located within this file. "
|
||
|
|
"If it doesn't exist,\n"
|
||
|
|
"# the test is skipped.\n"
|
||
|
|
"# If a callcount does exist, it is compared "
|
||
|
|
"to what we received. \n"
|
||
|
|
"# assertions are raised if the counts do not match.\n"
|
||
|
|
"# \n"
|
||
|
|
"# To add a new callcount test, apply the function_call_count \n"
|
||
|
|
"# decorator and re-run the tests using the --write-profiles \n"
|
||
|
|
"# option - this file will be rewritten including the new count.\n"
|
||
|
|
"# \n"
|
||
|
|
) % (self.fname)
|
||
|
|
|
||
|
|
def _read(self):
|
||
|
|
try:
|
||
|
|
profile_f = open(self.fname)
|
||
|
|
except IOError:
|
||
|
|
return
|
||
|
|
for lineno, line in enumerate(profile_f):
|
||
|
|
line = line.strip()
|
||
|
|
if not line or line.startswith("#"):
|
||
|
|
continue
|
||
|
|
|
||
|
|
test_key, platform_key, counts = line.split()
|
||
|
|
per_fn = self.data[test_key]
|
||
|
|
per_platform = per_fn[platform_key]
|
||
|
|
c = [int(count) for count in counts.split(",")]
|
||
|
|
per_platform['counts'] = c
|
||
|
|
per_platform['lineno'] = lineno + 1
|
||
|
|
per_platform['current_count'] = 0
|
||
|
|
profile_f.close()
|
||
|
|
|
||
|
|
def _write(self):
|
||
|
|
print(("Writing profile file %s" % self.fname))
|
||
|
|
profile_f = open(self.fname, "w")
|
||
|
|
profile_f.write(self._header())
|
||
|
|
for test_key in sorted(self.data):
|
||
|
|
|
||
|
|
per_fn = self.data[test_key]
|
||
|
|
profile_f.write("\n# TEST: %s\n\n" % test_key)
|
||
|
|
for platform_key in sorted(per_fn):
|
||
|
|
per_platform = per_fn[platform_key]
|
||
|
|
c = ",".join(str(count) for count in per_platform['counts'])
|
||
|
|
profile_f.write("%s %s %s\n" % (test_key, platform_key, c))
|
||
|
|
profile_f.close()
|
||
|
|
|
||
|
|
|
||
|
|
def function_call_count(variance=0.05):
|
||
|
|
"""Assert a target for a test case's function call count.
|
||
|
|
|
||
|
|
The main purpose of this assertion is to detect changes in
|
||
|
|
callcounts for various functions - the actual number is not as important.
|
||
|
|
Callcounts are stored in a file keyed to Python version and OS platform
|
||
|
|
information. This file is generated automatically for new tests,
|
||
|
|
and versioned so that unexpected changes in callcounts will be detected.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
def decorate(fn):
|
||
|
|
def wrap(*args, **kw):
|
||
|
|
with count_functions(variance=variance):
|
||
|
|
return fn(*args, **kw)
|
||
|
|
return update_wrapper(wrap, fn)
|
||
|
|
return decorate
|
||
|
|
|
||
|
|
|
||
|
|
@contextlib.contextmanager
|
||
|
|
def count_functions(variance=0.05):
|
||
|
|
if cProfile is None:
|
||
|
|
raise SkipTest("cProfile is not installed")
|
||
|
|
|
||
|
|
if not _profile_stats.has_stats() and not _profile_stats.write:
|
||
|
|
config.skip_test(
|
||
|
|
"No profiling stats available on this "
|
||
|
|
"platform for this function. Run tests with "
|
||
|
|
"--write-profiles to add statistics to %s for "
|
||
|
|
"this platform." % _profile_stats.short_fname)
|
||
|
|
|
||
|
|
gc_collect()
|
||
|
|
|
||
|
|
pr = cProfile.Profile()
|
||
|
|
pr.enable()
|
||
|
|
#began = time.time()
|
||
|
|
yield
|
||
|
|
#ended = time.time()
|
||
|
|
pr.disable()
|
||
|
|
|
||
|
|
#s = compat.StringIO()
|
||
|
|
stats = pstats.Stats(pr, stream=sys.stdout)
|
||
|
|
|
||
|
|
#timespent = ended - began
|
||
|
|
callcount = stats.total_calls
|
||
|
|
|
||
|
|
expected = _profile_stats.result(callcount)
|
||
|
|
|
||
|
|
if expected is None:
|
||
|
|
expected_count = None
|
||
|
|
else:
|
||
|
|
line_no, expected_count = expected
|
||
|
|
|
||
|
|
print(("Pstats calls: %d Expected %s" % (
|
||
|
|
callcount,
|
||
|
|
expected_count
|
||
|
|
)
|
||
|
|
))
|
||
|
|
stats.sort_stats("cumulative")
|
||
|
|
stats.print_stats()
|
||
|
|
|
||
|
|
if expected_count:
|
||
|
|
deviance = int(callcount * variance)
|
||
|
|
failed = abs(callcount - expected_count) > deviance
|
||
|
|
|
||
|
|
if failed or _profile_stats.force_write:
|
||
|
|
if _profile_stats.write:
|
||
|
|
_profile_stats.replace(callcount)
|
||
|
|
else:
|
||
|
|
raise AssertionError(
|
||
|
|
"Adjusted function call count %s not within %s%% "
|
||
|
|
"of expected %s, platform %s. Rerun with "
|
||
|
|
"--write-profiles to "
|
||
|
|
"regenerate this callcount."
|
||
|
|
% (
|
||
|
|
callcount, (variance * 100),
|
||
|
|
expected_count, _profile_stats.platform_key))
|
||
|
|
|
||
|
|
|