1 /* 2 * Copyright (c) 2013, 2014, 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 com.oracle.java.testlibrary.* GeneratedClassLoader 28 * @run main/othervm/timeout=200 -Xmx300m 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 Class<?> c; 42 43 public static void main(String... args) { 44 runGrowing(Long.valueOf(System.getProperty("time", "80000")), 45 Integer.valueOf(System.getProperty("iterations", "200"))); 46 // try to clean up and unload classes to decrease 47 // class verification time in debug vm 48 System.gc(); 49 } 50 51 private static void runGrowing(long time, int iterations) { 52 long startTime = System.currentTimeMillis(); 53 for (int i = 0; System.currentTimeMillis() < startTime + time && i < iterations; ++i) { 54 try { 55 GeneratedClassLoader gcl = new GeneratedClassLoader(); 56 57 // getGeneratedClasses throws a RuntimeException in cases where 58 // the javac exit code is not 0. If the original reason for the exception is 59 // a "java.lang.OutOfMemoryError: Java heap space", 60 // increase the heap size in the @run tag and rerun the test. 61 // The heap can be exhausted by this test, but heap exhaustion 62 // is not a failure mode of this test and should be ignored. 63 c = gcl.getGeneratedClasses(i, 100)[0]; 64 c.newInstance(); 65 c = null; 66 67 gcl = null; 68 } catch (IOException | InstantiationException | IllegalAccessException ex) { 69 throw new RuntimeException(ex); 70 } 71 } 72 } 73 }