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annotate test/gc/7168848/HumongousAlloc.java @ 8733:9def4075da6d

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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate(). Reviewed-by: johnc, ysr Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Tue, 05 Mar 2013 15:36:56 -0800
parents 9a344d88dc22
children
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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