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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 * @build GeneratedClassLoader
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28 * @run main/othervm/timeout=200 FragmentMetaspace
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29 */
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30
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31 import java.io.IOException;
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32
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33 /**
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34 * Test that tries to fragment the native memory used by class loaders.
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35 * This test creates class loaders that load classes of increasing size for every
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36 * iteration. By increasing the size of the class meta data needed for every iteration
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37 * we stress the subsystem for allocating native memory for meta data.
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38 */
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39 public class FragmentMetaspace {
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40
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41 public static void main(String... args) {
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42 runGrowing(Long.valueOf(System.getProperty("time", "80000")));
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43 // try to clean up and unload classes to decrease
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44 // class verification time in debug vm
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45 System.gc();
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46 }
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47
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48 private static void runGrowing(long time) {
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49 long startTime = System.currentTimeMillis();
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50 for (int i = 0; System.currentTimeMillis() < startTime + time; ++i) {
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51 try {
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52 GeneratedClassLoader gcl = new GeneratedClassLoader();
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53
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54 Class<?> c = gcl.getGeneratedClasses(i, 100)[0];
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55 c.newInstance();
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56 c = null;
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57
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58 gcl = null;
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59 } catch (IOException|InstantiationException|IllegalAccessException ex) {
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60 throw new RuntimeException(ex);
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61 }
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62 }
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63 }
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64 }
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