Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: test/runtime/Metaspace/FragmentMetaspaceSimple.java
test/runtime/Metaspace/FragmentMetaspaceSimple.java
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| 1 /* | |
| 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 */ | |
| 23 | |
| 24 /** | |
| 25 * @test | |
| 26 * @library /runtime/testlibrary | |
| 27 * @library classes | |
| 28 * @build test.Empty ClassUnloadCommon | |
| 29 * @run main/othervm/timeout=200 FragmentMetaspaceSimple | |
| 30 */ | |
| 31 | |
| 32 import java.util.ArrayList; | |
| 33 | |
| 34 /** | |
| 35 * Test that tries to fragment the native memory used by class loaders. | |
| 36 * Keeps every other class loader alive in order to fragment the memory space | |
| 37 * used to store classes and meta data. Since the memory is probably allocated in | |
| 38 * chunks per class loader this will cause a lot of fragmentation if not handled | |
| 39 * properly since every other chunk will be unused. | |
| 40 */ | |
| 41 public class FragmentMetaspaceSimple { | |
| 42 public static void main(String... args) { | |
| 43 runSimple(Long.valueOf(System.getProperty("time", "80000"))); | |
| 44 System.gc(); | |
| 45 } | |
| 46 | |
| 47 private static void runSimple(long time) { | |
| 48 long startTime = System.currentTimeMillis(); | |
| 49 ArrayList<ClassLoader> cls = new ArrayList<>(); | |
| 50 for (int i = 0; System.currentTimeMillis() < startTime + time; ++i) { | |
| 51 ClassLoader ldr = ClassUnloadCommon.newClassLoader(); | |
| 52 if (i % 1000 == 0) { | |
| 53 cls.clear(); | |
| 54 } | |
| 55 // only keep every other class loader alive | |
| 56 if (i % 2 == 1) { | |
| 57 cls.add(ldr); | |
| 58 } | |
| 59 Class<?> c = null; | |
| 60 try { | |
| 61 c = ldr.loadClass("test.Empty"); | |
| 62 } catch (ClassNotFoundException ex) { | |
| 63 throw new RuntimeException(ex); | |
| 64 } | |
| 65 c = null; | |
| 66 } | |
| 67 cls = null; | |
| 68 } | |
| 69 } |
