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# Copyright (C) 2015 Yahoo! Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Profile a simple engine build/load/compile/prepare/validate/run.
"""
import argparse
import cProfile as profiler
import io
import pstats
from oslo_utils import timeutils
from taskflow import engines
from taskflow.patterns import linear_flow as lf
from taskflow import task
def print_header(name):
if name:
header_footer = "-" * len(name)
print(header_footer)
print(name)
print(header_footer)
class ProfileIt(object):
stats_ordering = ('cumulative', 'calls',)
def __init__(self, name, args):
self.name = name
self.profile = profiler.Profile()
self.args = args
def __enter__(self):
self.profile.enable()
def __exit__(self, exc_tp, exc_v, exc_tb):
self.profile.disable()
buf = io.StringIO()
ps = pstats.Stats(self.profile, stream=buf)
ps = ps.sort_stats(*self.stats_ordering)
percent_limit = max(0.0, max(1.0, self.args.limit / 100.0))
ps.print_stats(percent_limit)
print_header(self.name)
needs_newline = False
for line in buf.getvalue().splitlines():
line = line.lstrip()
if line:
print(line)
needs_newline = True
if needs_newline:
print("")
class TimeIt(object):
def __init__(self, name, args):
self.watch = timeutils.StopWatch()
self.name = name
self.args = args
def __enter__(self):
self.watch.restart()
def __exit__(self, exc_tp, exc_v, exc_tb):
self.watch.stop()
duration = self.watch.elapsed()
print_header(self.name)
print("- Took %0.3f seconds to run" % (duration))
class DummyTask(task.Task):
def execute(self):
pass
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--profile', "-p",
dest='profile', action='store_true',
default=False,
help='profile instead of gather timing'
' (default: False)')
parser.add_argument('--dummies', "-d",
dest='dummies', action='store', type=int,
default=100, metavar="<number>",
help='how many dummy/no-op tasks to inject'
' (default: 100)')
parser.add_argument('--limit', '-l',
dest='limit', action='store', type=float,
default=100.0, metavar="<number>",
help='percentage of profiling output to show'
' (default: 100%%)')
args = parser.parse_args()
if args.profile:
ctx_manager = ProfileIt
else:
ctx_manager = TimeIt
dummy_am = max(0, args.dummies)
with ctx_manager("Building linear flow with %s tasks" % dummy_am, args):
f = lf.Flow("root")
for i in compat_range(0, dummy_am):
f.add(DummyTask(name="dummy_%s" % i))
with ctx_manager("Loading", args):
e = engines.load(f)
with ctx_manager("Compiling", args):
e.compile()
with ctx_manager("Preparing", args):
e.prepare()
with ctx_manager("Validating", args):
e.validate()
with ctx_manager("Running", args):
e.run()
if __name__ == "__main__":
main()
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