You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
328 lines
9.9 KiB
328 lines
9.9 KiB
# testing/profiling.py
|
|
# Copyright (C) 2005-2023 the SQLAlchemy authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: https://www.opensource.org/licenses/mit-license.php
|
|
# mypy: ignore-errors
|
|
|
|
|
|
"""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.
|
|
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
import collections
|
|
import contextlib
|
|
import os
|
|
import platform
|
|
import pstats
|
|
import re
|
|
import sys
|
|
|
|
from . import config
|
|
from .util import gc_collect
|
|
from ..util import has_compiled_ext
|
|
|
|
|
|
try:
|
|
import cProfile
|
|
except ImportError:
|
|
cProfile = None
|
|
|
|
_profile_stats = None
|
|
"""global ProfileStatsFileInstance.
|
|
|
|
plugin_base assigns this at the start of all tests.
|
|
|
|
"""
|
|
|
|
|
|
_current_test = None
|
|
"""String id of current test.
|
|
|
|
plugin_base assigns this at the start of each test using
|
|
_start_current_test.
|
|
|
|
"""
|
|
|
|
|
|
def _start_current_test(id_):
|
|
global _current_test
|
|
_current_test = id_
|
|
|
|
if _profile_stats.force_write:
|
|
_profile_stats.reset_count()
|
|
|
|
|
|
class ProfileStatsFile:
|
|
"""Store per-platform/fn profiling results in a file.
|
|
|
|
There was no json module available when this was written, but now
|
|
the file format which is very deterministically line oriented is kind of
|
|
handy in any case for diffs and merges.
|
|
|
|
"""
|
|
|
|
def __init__(self, filename, sort="cumulative", dump=None):
|
|
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.dump = dump
|
|
self.sort = sort
|
|
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
|
|
|
|
if config.db.name == "sqlite" and config.db.dialect._is_url_file_db(
|
|
config.db.url
|
|
):
|
|
dbapi_key += "_file"
|
|
|
|
# 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 = [
|
|
platform.machine(),
|
|
platform.system().lower(),
|
|
platform.python_implementation().lower(),
|
|
py_version,
|
|
dbapi_key,
|
|
]
|
|
|
|
platform_tokens.append("dbapiunicode")
|
|
_has_cext = has_compiled_ext()
|
|
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 reset_count(self):
|
|
test_key = _current_test
|
|
# since self.data is a defaultdict, don't access a key
|
|
# if we don't know it's there first.
|
|
if test_key not in self.data:
|
|
return
|
|
per_fn = self.data[test_key]
|
|
if self.platform_key not in per_fn:
|
|
return
|
|
per_platform = per_fn[self.platform_key]
|
|
if "counts" in per_platform:
|
|
per_platform["counts"][:] = []
|
|
|
|
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 OSError:
|
|
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, times=1, warmup=0):
|
|
"""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.
|
|
|
|
"""
|
|
|
|
# use signature-rewriting decorator function so that pytest fixtures
|
|
# still work on py27. In Py3, update_wrapper() alone is good enough,
|
|
# likely due to the introduction of __signature__.
|
|
|
|
from sqlalchemy.util import decorator
|
|
|
|
@decorator
|
|
def wrap(fn, *args, **kw):
|
|
|
|
for warm in range(warmup):
|
|
fn(*args, **kw)
|
|
|
|
timerange = range(times)
|
|
with count_functions(variance=variance):
|
|
for time in timerange:
|
|
rv = fn(*args, **kw)
|
|
return rv
|
|
|
|
return wrap
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def count_functions(variance=0.05):
|
|
if cProfile is None:
|
|
raise config._skip_test_exception("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 = 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(*re.split(r"[, ]", _profile_stats.sort))
|
|
stats.print_stats()
|
|
if _profile_stats.dump:
|
|
base, ext = os.path.splitext(_profile_stats.dump)
|
|
test_name = _current_test.split(".")[-1]
|
|
dumpfile = "%s_%s%s" % (base, test_name, ext or ".profile")
|
|
stats.dump_stats(dumpfile)
|
|
print("Dumped stats to file %s" % dumpfile)
|
|
# stats.print_callers()
|
|
if _profile_stats.force_write:
|
|
_profile_stats.replace(callcount)
|
|
elif expected_count:
|
|
deviance = int(callcount * variance)
|
|
failed = abs(callcount - expected_count) > deviance
|
|
|
|
if failed:
|
|
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,
|
|
)
|
|
)
|