| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.lang.management.ManagementFactory; |
| import utils.GarbageProducer; |
| import common.TmTool; |
| import utils.JstatResults; |
| |
| /** |
| * Base class for jstat testing which uses GarbageProducer to allocate garbage. |
| */ |
| public class GarbageProducerTest { |
| |
| // Iterations of measurement to get consistent value of counters and jstat. |
| private final static int ITERATIONS = 10; |
| private final static float TARGET_MEMORY_USAGE = 0.7f; |
| private final static float MEASUREMENT_TOLERANCE = 0.05f; |
| private final GarbageProducer garbageProducer; |
| private final TmTool<? extends JstatResults> jstatTool; |
| |
| public GarbageProducerTest(TmTool<? extends JstatResults> tool) { |
| garbageProducer = new GarbageProducer(TARGET_MEMORY_USAGE); |
| // We will be running jstat tool |
| jstatTool = tool; |
| } |
| |
| public void run() throws Exception { |
| // Run once and get the results asserting that they are reasonable |
| JstatResults measurement1 = jstatTool.measure(); |
| measurement1.assertConsistency(); |
| // Eat metaspace and heap then run the tool again and get the results asserting that they are reasonable |
| System.gc(); |
| garbageProducer.allocateMetaspaceAndHeap(); |
| // Collect garbage. Also update VM statistics |
| System.gc(); |
| int i = 0; |
| long collectionCountBefore = getCollectionCount(); |
| JstatResults measurement2 = jstatTool.measure(); |
| do { |
| System.out.println("Measurement #" + i); |
| long currentCounter = getCollectionCount(); |
| // Check if GC cycle occured during measurement |
| if (currentCounter == collectionCountBefore) { |
| measurement2.assertConsistency(); |
| checkOldGenMeasurement(measurement2); |
| return; |
| } else { |
| System.out.println("GC happened during measurement."); |
| } |
| collectionCountBefore = getCollectionCount(); |
| measurement2 = jstatTool.measure(); |
| |
| } while (i++ < ITERATIONS); |
| // Checking will be performed without consistency guarantee. |
| checkOldGenMeasurement(measurement2); |
| } |
| |
| private void checkOldGenMeasurement(JstatResults measurement2) { |
| float oldGenAllocationRatio = garbageProducer.getOldGenAllocationRatio() - MEASUREMENT_TOLERANCE; |
| // Assert that space has been utilized accordingly |
| JstatResults.assertSpaceUtilization(measurement2, TARGET_MEMORY_USAGE, oldGenAllocationRatio); |
| } |
| |
| private static long getCollectionCount() { |
| return ManagementFactory.getGarbageCollectorMXBeans().stream() |
| .mapToLong(b -> b.getCollectionCount()) |
| .sum(); |
| } |
| } |