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6642c377d5
More detail: http://linux-mm.org/Drop_Caches Change-Id: I7fa675ccdc81f375d88e9cfab330fca3bc983ec8 Reviewed-on: http://gerrit.ent.cloudera.com:8080/1157 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Reviewed-by: Lenni Kuff <lskuff@cloudera.com> Tested-by: Nong Li <nong@cloudera.com>
34 lines
1.3 KiB
Python
34 lines
1.3 KiB
Python
#!/usr/bin/env python
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# Copyright (c) 2012 Cloudera, Inc. All rights reserved.
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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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#
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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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from tests.util.cluster_controller import ClusterController
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from tests.benchmark.plugins import Plugin
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class ClearBufferCache(Plugin):
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"""Plugin that clears the buffer cache before a query is run."""
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__name__ = "ClearBufferCache"
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def __init__(self, *args, **kwargs):
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self.cluster_controller = ClusterController(*args, **kwargs)
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Plugin.__init__(self, *args, **kwargs)
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def run_pre_hook(self, context=None):
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# Drop the page cache (drop_caches=1). We'll leave the inodes and dentries
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# since that is not what we are testing and it causes excessive performance
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# variability.
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cmd = "sysctl -w vm.drop_caches=1 vm.drop_caches=0"
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self.cluster_controller.run_cmd(cmd)
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