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