104 lines
3.9 KiB
Java
104 lines
3.9 KiB
Java
/*
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* Copyright (c) 2011, 2021, 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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package gc;
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/**
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* @test TestFullGCCount.java
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* @bug 7072527
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* @summary JMM GC counters overcount in some cases
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* @comment Shenandoah has "ExplicitGCInvokesConcurrent" on by default
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* @requires !(vm.gc == "Shenandoah" & vm.opt.ExplicitGCInvokesConcurrent != false)
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* @comment G1 has separate counters for STW Full GC and concurrent GC.
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* @requires !(vm.gc.G1 & vm.opt.ExplicitGCInvokesConcurrent == true)
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* @requires vm.gc != "Z"
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* @modules java.management
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* @run main/othervm -Xlog:gc gc.TestFullGCCount
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*/
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import java.lang.management.GarbageCollectorMXBean;
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import java.lang.management.ManagementFactory;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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/*
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* Originally for a specific failure in CMS[[keep]], this test now monitors all
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* collectors for double-counting of collections.
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*/
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public class TestFullGCCount {
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static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
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public static void main(String[] args) {
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int iterations = 20;
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boolean failed = false;
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String errorMessage = "";
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HashMap<String, List<Long>> counts = new HashMap<>();
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// Prime the collection of count lists for all collectors.
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for (int i = 0; i < collectors.size(); i++) {
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GarbageCollectorMXBean collector = collectors.get(i);
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counts.put(collector.getName(), new ArrayList<>(iterations));
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}
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// Perform some gc, record collector counts.
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for (int i = 0; i < iterations; i++) {
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System.gc();
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addCollectionCount(counts, i);
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}
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// Check the increments:
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// Old gen collectors should increase by one,
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// New collectors may or may not increase.
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// Any increase >=2 is unexpected.
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for (String collector : counts.keySet()) {
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System.out.println("Checking: " + collector);
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for (int i = 0; i < iterations - 1; i++) {
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List<Long> theseCounts = counts.get(collector);
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long a = theseCounts.get(i);
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long b = theseCounts.get(i + 1);
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if (b - a >= 2) {
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failed = true;
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errorMessage += "Collector '" + collector + "' has increment " + (b - a) +
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" at iteration " + i + "\n";
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}
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}
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}
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if (failed) {
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System.err.println(errorMessage);
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throw new RuntimeException("FAILED: System.gc collections miscounted.");
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}
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System.out.println("Passed.");
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}
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private static void addCollectionCount(HashMap<String, List<Long>> counts, int iteration) {
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for (int i = 0; i < collectors.size(); i++) {
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GarbageCollectorMXBean collector = collectors.get(i);
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List<Long> thisList = counts.get(collector.getName());
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thisList.add(collector.getCollectionCount());
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}
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}
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}
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