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annotate test/gc/7168848/HumongousAlloc.java @ 6105:9a344d88dc22

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7168848: Add test to check that humongous object allocation path also checks the heap occupancy. Summary: Added test that checks humongous object allocation path also check the heap occupancy and initiate a marking cycle when / if needed. Reviewed-by: brutisso, jwilhelm
author mnunez
date Mon, 21 May 2012 14:59:59 +0200
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6105
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
9a344d88dc22 7168848: Add test to check that humongous object allocation path also checks the heap occupancy.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
9a344d88dc22 7168848: Add test to check that humongous object allocation path also checks the heap occupancy.
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test Humongous.java
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26 * @bug 7168848
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27 * @summary G1: humongous object allocations should initiate marking cycles when necessary
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28 * @run main/othervm -Xms100m -Xmx100m -XX:+PrintGC -XX:G1HeapRegionSize=1m -XX:+UseG1GC HumongousAlloc
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29 *
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30 */
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31 import java.lang.management.GarbageCollectorMXBean;
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32 import java.lang.management.ManagementFactory;
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33 import java.util.List;
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34
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35 public class HumongousAlloc {
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36
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37 public static byte[] dummy;
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38 private static int sleepFreq = 40;
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39 private static int sleepTime = 1000;
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40 private static double size = 0.75;
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41 private static int iterations = 50;
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42 private static int MB = 1024 * 1024;
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43
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44 public static void allocate(int size, int sleepTime, int sleepFreq) throws InterruptedException {
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45 System.out.println("Will allocate objects of size: " + size
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46 + " bytes and sleep for " + sleepTime
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47 + " ms after every " + sleepFreq + "th allocation.");
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48 int count = 0;
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49 while (count < iterations) {
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50 for (int i = 0; i < sleepFreq; i++) {
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51 dummy = new byte[size - 16];
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52 }
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53 Thread.sleep(sleepTime);
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54 count++;
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55 }
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56 }
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57
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58 public static void main(String[] args) throws InterruptedException {
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59 allocate((int) (size * MB), sleepTime, sleepFreq);
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60 List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
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61 for (GarbageCollectorMXBean collector : collectors) {
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62 if (collector.getName().contains("G1 Old")) {
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63 long count = collector.getCollectionCount();
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64 if (count > 0) {
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65 throw new RuntimeException("Failed: FullGCs should not have happened. The number of FullGC run is " + count);
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66 }
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67 else {
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68 System.out.println("Passed.");
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69 }
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70 }
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71 }
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72 }
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73 }
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74