Mercurial > hg > graal-compiler
view test/gc/7072527/TestFullGCCount.java @ 20382:b1266b08b994
8056043: Heap does not shrink within the heap after JDK-8038423
Summary: Enable shrinking within the heap by removing some code added for JDK-8054818. Enable the test case that checks that again too.
Reviewed-by: jwilhelm, jmasa
author | tschatzl |
---|---|
date | Wed, 03 Sep 2014 09:24:07 +0200 |
parents | bfe3be9ebd6c |
children |
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/* * Copyright (c) 2011, 2013, 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. */ /* * @test TestFullGCount.java * @bug 7072527 * @summary CMS: JMM GC counters overcount in some cases * @run main/othervm -XX:+PrintGC TestFullGCCount */ import java.util.*; import java.lang.management.*; /* * Originally for a specific failure in CMS, this test now monitors all * collectors for double-counting of collections. */ public class TestFullGCCount { static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); public static void main(String[] args) { int iterations = 20; boolean failed = false; String errorMessage = ""; HashMap<String, List> counts = new HashMap<String, List>(); // Prime the collection of count lists for all collectors. for (int i = 0; i < collectors.size(); i++) { GarbageCollectorMXBean collector = collectors.get(i); counts.put(collector.getName(), new ArrayList<Long>(iterations)); } // Perform some gc, record collector counts. for (int i = 0; i < iterations; i++) { System.gc(); addCollectionCount(counts, i); } // Check the increments: // Old gen collectors should increase by one, // New collectors may or may not increase. // Any increase >=2 is unexpected. for (String collector : counts.keySet()) { System.out.println("Checking: " + collector); for (int i = 0; i < iterations - 1; i++) { List<Long> theseCounts = counts.get(collector); long a = theseCounts.get(i); long b = theseCounts.get(i + 1); if (b - a >= 2) { failed = true; errorMessage += "Collector '" + collector + "' has increment " + (b - a) + " at iteration " + i + "\n"; } } } if (failed) { System.err.println(errorMessage); throw new RuntimeException("FAILED: System.gc collections miscounted."); } System.out.println("Passed."); } private static void addCollectionCount(HashMap<String, List> counts, int iteration) { for (int i = 0; i < collectors.size(); i++) { GarbageCollectorMXBean collector = collectors.get(i); List thisList = counts.get(collector.getName()); thisList.add(collector.getCollectionCount()); } } }