| /* |
| * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| // ClassFileInstaller is needed to place test.Empty into well-known place |
| /** |
| * @test |
| * @library /test/lib classes |
| * @build test.Empty |
| * @run driver ClassFileInstaller test.Empty |
| * @run main/othervm/timeout=200 FragmentMetaspaceSimple |
| */ |
| |
| import java.io.DataInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| /** |
| * Test that tries to fragment the native memory used by class loaders. |
| * Keeps every other class loader alive in order to fragment the memory space |
| * used to store classes and meta data. Since the memory is probably allocated in |
| * chunks per class loader this will cause a lot of fragmentation if not handled |
| * properly since every other chunk will be unused. |
| */ |
| public class FragmentMetaspaceSimple { |
| public static void main(String... args) { |
| runSimple(Long.valueOf(System.getProperty("time", "80000"))); |
| System.gc(); |
| } |
| |
| private static void runSimple(long time) { |
| long startTime = System.currentTimeMillis(); |
| ArrayList<ClassLoader> cls = new ArrayList<>(); |
| char sep = File.separatorChar; |
| String fileName = "test" + sep + "Empty.class"; |
| File file = new File(fileName); |
| byte buff[] = read(file); |
| |
| int i = 0; |
| for (i = 0; System.currentTimeMillis() < startTime + time; ++i) { |
| ClassLoader ldr = new MyClassLoader(buff); |
| if (i % 1000 == 0) { |
| cls.clear(); |
| } |
| // only keep every other class loader alive |
| if (i % 2 == 1) { |
| cls.add(ldr); |
| } |
| Class<?> c = null; |
| try { |
| c = ldr.loadClass("test.Empty"); |
| c.getClass().getClassLoader(); // make sure we have a valid class. |
| } catch (ClassNotFoundException ex) { |
| System.out.println("i=" + i + ", len" + buff.length); |
| throw new RuntimeException(ex); |
| } |
| c = null; |
| } |
| cls = null; |
| System.out.println("Finished " + i + " iterations in " + |
| (System.currentTimeMillis() - startTime) + " ms"); |
| } |
| |
| private static byte[] read(File file) { |
| byte buff[] = new byte[(int)(file.length())]; |
| try { |
| DataInputStream din = new DataInputStream(new FileInputStream(file)); |
| din.readFully(buff); |
| din.close(); |
| } catch (IOException ex) { |
| throw new RuntimeException(ex); |
| } |
| return buff; |
| } |
| |
| static class MyClassLoader extends ClassLoader { |
| byte buff[]; |
| MyClassLoader(byte buff[]) { |
| this.buff = buff; |
| } |
| |
| public Class<?> loadClass() throws ClassNotFoundException { |
| String name = "test.Empty"; |
| try { |
| return defineClass(name, buff, 0, buff.length); |
| } catch (Throwable e) { |
| throw new ClassNotFoundException(name, e); |
| } |
| } |
| } |
| } |