113 lines
4.0 KiB
Java
113 lines
4.0 KiB
Java
/*
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* Copyright (c) 2013, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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// ClassFileInstaller is needed to place test.Empty into well-known place
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/**
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* @test
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* @library /test/lib classes
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* @build test.Empty
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* @run driver jdk.test.lib.helpers.ClassFileInstaller test.Empty
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* @run main/othervm/timeout=200 FragmentMetaspaceSimple
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*/
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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/**
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* Test that tries to fragment the native memory used by class loaders.
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* Keeps every other class loader alive in order to fragment the memory space
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* used to store classes and meta data. Since the memory is probably allocated in
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* chunks per class loader this will cause a lot of fragmentation if not handled
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* properly since every other chunk will be unused.
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*/
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public class FragmentMetaspaceSimple {
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public static void main(String... args) {
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runSimple(Long.valueOf(System.getProperty("time", "80000")));
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System.gc();
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}
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private static void runSimple(long time) {
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long startTime = System.currentTimeMillis();
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ArrayList<ClassLoader> cls = new ArrayList<>();
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char sep = File.separatorChar;
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String fileName = "test" + sep + "Empty.class";
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File file = new File(fileName);
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byte buff[] = read(file);
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int i = 0;
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for (i = 0; System.currentTimeMillis() < startTime + time; ++i) {
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ClassLoader ldr = new MyClassLoader(buff);
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if (i % 1000 == 0) {
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cls.clear();
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}
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// only keep every other class loader alive
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if (i % 2 == 1) {
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cls.add(ldr);
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}
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Class<?> c = null;
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try {
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c = ldr.loadClass("test.Empty");
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c.getClass().getClassLoader(); // make sure we have a valid class.
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} catch (ClassNotFoundException ex) {
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System.out.println("i=" + i + ", len" + buff.length);
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throw new RuntimeException(ex);
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}
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c = null;
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}
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cls = null;
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System.out.println("Finished " + i + " iterations in " +
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(System.currentTimeMillis() - startTime) + " ms");
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}
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private static byte[] read(File file) {
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byte buff[] = new byte[(int)(file.length())];
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try {
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DataInputStream din = new DataInputStream(new FileInputStream(file));
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din.readFully(buff);
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din.close();
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} catch (IOException ex) {
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throw new RuntimeException(ex);
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}
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return buff;
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}
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static class MyClassLoader extends ClassLoader {
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byte buff[];
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MyClassLoader(byte buff[]) {
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this.buff = buff;
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}
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public Class<?> loadClass() throws ClassNotFoundException {
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String name = "test.Empty";
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try {
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return defineClass(name, buff, 0, buff.length);
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} catch (Throwable e) {
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throw new ClassNotFoundException(name, e);
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}
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}
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}
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}
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