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10344
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1 /*
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2 * Copyright (c) 2013, 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
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26 * @library /runtime/testlibrary
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27 * @library classes
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28 * @build test.Empty ClassUnloadCommon
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29 * @run main/othervm/timeout=200 FragmentMetaspaceSimple
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30 */
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31
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32 import java.util.ArrayList;
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33
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34 /**
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35 * Test that tries to fragment the native memory used by class loaders.
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36 * Keeps every other class loader alive in order to fragment the memory space
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37 * used to store classes and meta data. Since the memory is probably allocated in
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38 * chunks per class loader this will cause a lot of fragmentation if not handled
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39 * properly since every other chunk will be unused.
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40 */
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41 public class FragmentMetaspaceSimple {
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42 public static void main(String... args) {
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43 runSimple(Long.valueOf(System.getProperty("time", "80000")));
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44 System.gc();
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45 }
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46
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47 private static void runSimple(long time) {
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48 long startTime = System.currentTimeMillis();
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49 ArrayList<ClassLoader> cls = new ArrayList<>();
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50 for (int i = 0; System.currentTimeMillis() < startTime + time; ++i) {
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51 ClassLoader ldr = ClassUnloadCommon.newClassLoader();
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52 if (i % 1000 == 0) {
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53 cls.clear();
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54 }
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55 // only keep every other class loader alive
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56 if (i % 2 == 1) {
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57 cls.add(ldr);
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58 }
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59 Class<?> c = null;
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60 try {
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61 c = ldr.loadClass("test.Empty");
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62 } catch (ClassNotFoundException ex) {
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63 throw new RuntimeException(ex);
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64 }
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65 c = null;
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66 }
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67 cls = null;
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68 }
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69 }
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