58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
# python3
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# Copyright 2019 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Benchmark helpers."""
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import datetime
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from benchmarks.harness import machine
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class Timer:
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"""Helper to time runtime of some call.
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Usage:
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with Timer as t:
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# do something.
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t.get_time_in_seconds()
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"""
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def __init__(self):
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self._start = datetime.datetime.now()
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def __enter__(self):
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self.start()
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return self
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def start(self):
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"""Starts the timer."""
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self._start = datetime.datetime.now()
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def elapsed(self) -> float:
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"""Returns the elapsed time in seconds."""
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return (datetime.datetime.now() - self._start).total_seconds()
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def __exit__(self, exception_type, exception_value, exception_traceback):
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pass
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def drop_caches(target: machine.Machine):
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"""Drops caches on the machine.
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Args:
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target: A machine object.
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"""
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target.run("sudo sync")
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target.run("sudo sysctl vm.drop_caches=3")
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target.run("sudo sysctl vm.drop_caches=3")
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