aoqi@0: /*
aoqi@0:  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /**
aoqi@0:  * @test
aoqi@0:  * @library /runtime/testlibrary
aoqi@0:  * @build GeneratedClassLoader
aoqi@0:  * @run main/othervm/timeout=200 FragmentMetaspace
aoqi@0:  */
aoqi@0: 
aoqi@0: import java.io.IOException;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Test that tries to fragment the native memory used by class loaders.
aoqi@0:  * This test creates class loaders that load classes of increasing size for every
aoqi@0:  * iteration. By increasing the size of the class meta data needed for every iteration
aoqi@0:  * we stress the subsystem for allocating native memory for meta data.
aoqi@0:  */
aoqi@0: public class FragmentMetaspace {
aoqi@0: 
aoqi@0:     public static void main(String... args) {
aoqi@0:         runGrowing(Long.valueOf(System.getProperty("time", "80000")));
aoqi@0:         // try to clean up and unload classes to decrease
aoqi@0:         // class verification time in debug vm
aoqi@0:         System.gc();
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static void runGrowing(long time) {
aoqi@0:         long startTime = System.currentTimeMillis();
aoqi@0:         for (int i = 0; System.currentTimeMillis() < startTime + time; ++i) {
aoqi@0:             try {
aoqi@0:                 GeneratedClassLoader gcl = new GeneratedClassLoader();
aoqi@0: 
aoqi@0:                 Class<?> c = gcl.getGeneratedClasses(i, 100)[0];
aoqi@0:                 c.newInstance();
aoqi@0:                 c = null;
aoqi@0: 
aoqi@0:                 gcl = null;
aoqi@0:             } catch (IOException|InstantiationException|IllegalAccessException ex) {
aoqi@0:                 throw new RuntimeException(ex);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: }