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20296
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1 /*
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2 * Copyright (c) 2014, 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
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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
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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 TestEagerReclaimHumongousRegions
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26 * @bug 8027959
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27 * @summary Test to make sure that eager reclaim of humongous objects work. We simply try to fill
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28 * up the heap with humongous objects that should be eagerly reclaimable to avoid Full GC.
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29 * @key gc
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30 * @library /testlibrary
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31 */
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32
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33 import java.util.regex.Pattern;
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34 import java.util.regex.Matcher;
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35 import java.util.LinkedList;
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36
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37 import com.oracle.java.testlibrary.OutputAnalyzer;
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38 import com.oracle.java.testlibrary.ProcessTools;
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39 import com.oracle.java.testlibrary.Asserts;
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40
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41 class ReclaimRegionFast {
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42 public static final int M = 1024*1024;
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43
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44 public static LinkedList<Object> garbageList = new LinkedList<Object>();
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45
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46 public static void genGarbage() {
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47 for (int i = 0; i < 32*1024; i++) {
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48 garbageList.add(new int[100]);
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49 }
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50 garbageList.clear();
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51 }
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52
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53 // A large object referenced by a static.
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54 static int[] filler = new int[10 * M];
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55
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56 public static void main(String[] args) {
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57
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58 int[] large = new int[M];
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59
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60 Object ref_from_stack = large;
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61
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62 for (int i = 0; i < 100; i++) {
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63 // A large object that will be reclaimed eagerly.
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64 large = new int[6*M];
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65 genGarbage();
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66 // Make sure that the compiler cannot completely remove
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67 // the allocation of the large object until here.
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68 System.out.println(large);
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69 }
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70
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71 // Keep the reference to the first object alive.
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72 System.out.println(ref_from_stack);
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73 }
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74 }
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75
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76 public class TestEagerReclaimHumongousRegions {
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77 public static void main(String[] args) throws Exception {
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78 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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79 "-XX:+UseG1GC",
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80 "-Xms128M",
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81 "-Xmx128M",
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82 "-Xmn16M",
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83 "-XX:+PrintGC",
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84 ReclaimRegionFast.class.getName());
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85
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86 Pattern p = Pattern.compile("Full GC");
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87
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88 OutputAnalyzer output = new OutputAnalyzer(pb.start());
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89
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90 int found = 0;
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91 Matcher m = p.matcher(output.getStdout());
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92 while (m.find()) { found++; }
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93 System.out.println("Issued " + found + " Full GCs");
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94 Asserts.assertLT(found, 10, "Found that " + found + " Full GCs were issued. This is larger than the bound. Eager reclaim seems to not work at all");
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95
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96 output.shouldHaveExitValue(0);
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97 }
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98 }
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