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