| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you 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. |
| |
| from tests.util.cluster_controller import ClusterController |
| from tests.benchmark.plugins import Plugin |
| |
| class ClearBufferCache(Plugin): |
| """Plugin that clears the buffer cache before a query is run.""" |
| |
| __name__ = "ClearBufferCache" |
| |
| def __init__(self, *args, **kwargs): |
| self.cluster_controller = ClusterController(*args, **kwargs) |
| Plugin.__init__(self, *args, **kwargs) |
| |
| def run_pre_hook(self, context=None): |
| # Drop the page cache (drop_caches=1). We'll leave the inodes and dentries |
| # since that is not what we are testing and it causes excessive performance |
| # variability. |
| cmd = "sysctl -w vm.drop_caches=1 vm.drop_caches=0" |
| self.cluster_controller.deprecated_run_cmd(cmd) |