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#!/usr/bin/env python3
#
# Copyright (C) 2017 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
import cProfile
import pstats
import os
import datetime
import time
# Track what profile topics are active
active_topics = {}
active_profiles = {}
initialized = False
# Use the topic values here to decide what to profile
# by setting them in the BST_PROFILE environment variable.
#
# Multiple topics can be set with the ':' separator.
#
# E.g.:
#
# BST_PROFILE=circ-dep-check:sort-deps bst <command> <args>
#
# The special 'all' value will enable all profiles
class Topics():
CIRCULAR_CHECK = 'circ-dep-check'
SORT_DEPENDENCIES = 'sort-deps'
LOAD_LOADER = 'load-loader'
LOAD_CONTEXT = 'load-context'
LOAD_PROJECT = 'load-project'
LOAD_PIPELINE = 'load-pipeline'
SHOW = 'show'
ALL = 'all'
class Profile():
def __init__(self, topic, key, message):
self.message = message
self.key = topic + '-' + key
self.start = time.time()
self.profiler = cProfile.Profile()
self.profiler.enable()
def end(self):
self.profiler.disable()
filename = self.key.replace('/', '-')
filename = filename.replace('.', '-')
filename = os.path.join(os.getcwd(), 'profile-' + filename + '.log')
with open(filename, "a", encoding="utf-8") as f:
dt = datetime.datetime.fromtimestamp(self.start)
time = dt.strftime('%Y-%m-%d %H:%M:%S')
heading = '================================================================\n'
heading += 'Profile for key: {}\n'.format(self.key)
heading += 'Started at: {}\n'.format(time)
if self.message:
heading += '\n {}'.format(message)
heading += '================================================================\n'
f.write(heading)
ps = pstats.Stats(self.profiler, stream=f).sort_stats('cumulative')
ps.print_stats()
# profile_start()
#
# Start profiling for a given topic.
#
# Args:
# topic (str): A topic name
# key (str): A key for this profile run
# message (str): An optional message to print in profile results
#
def profile_start(topic, key, message=None):
if not profile_enabled(topic):
return
# Start profiling and hold on to the key
profile = Profile(topic, key, message)
assert(active_profiles.get(profile.key) is None)
active_profiles[profile.key] = profile
# profile_end()
#
# Ends a profiling session previously
# started with profile_start()
#
# Args:
# topic (str): A topic name
# key (str): A key for this profile run
#
def profile_end(topic, key):
if not profile_enabled(topic):
return
topic_key = topic + '-' + key
profile = active_profiles.get(topic_key)
assert(profile)
profile.end()
del active_profiles[topic_key]
def profile_init():
global initialized
if not initialized:
setting = os.getenv('BST_PROFILE')
if setting:
topics = setting.split(':')
for topic in topics:
active_topics[topic] = True
initialized = True
def profile_enabled(topic):
profile_init()
if active_topics.get(topic):
return True
if active_topics.get(Topics.ALL):
return True
return False
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