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# python3
# Copyright 2019 Google LLC
#
# 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.
"""Benchmark helpers."""
import datetime
from benchmarks.harness import machine
class Timer:
"""Helper to time runtime of some call.
Usage:
with Timer as t:
# do something.
t.get_time_in_seconds()
"""
def __init__(self):
self._start = datetime.datetime.now()
def __enter__(self):
self.start()
return self
def start(self):
"""Starts the timer."""
self._start = datetime.datetime.now()
def elapsed(self) -> float:
"""Returns the elapsed time in seconds."""
return (datetime.datetime.now() - self._start).total_seconds()
def __exit__(self, exception_type, exception_value, exception_traceback):
pass
def drop_caches(target: machine.Machine):
"""Drops caches on the machine.
Args:
target: A machine object.
"""
target.run("sudo sync")
target.run("sudo sysctl vm.drop_caches=3")
target.run("sudo sysctl vm.drop_caches=3")
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