1/*
2 * Copyright (c) 2013, 2016, 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 * @modules java.base/jdk.internal.misc
28 * @modules java.compiler
29 * @run main/othervm/timeout=200 -Xmx300m FragmentMetaspace
30 */
31
32import java.io.IOException;
33
34/**
35 * Test that tries to fragment the native memory used by class loaders.
36 * This test creates class loaders that load classes of increasing size for every
37 * iteration. By increasing the size of the class meta data needed for every iteration
38 * we stress the subsystem for allocating native memory for meta data.
39 */
40public class FragmentMetaspace {
41
42    public static Class<?> c;
43
44    public static void main(String... args) {
45        runGrowing(Long.valueOf(System.getProperty("time", "80000")),
46            Integer.valueOf(System.getProperty("iterations", "200")));
47        // try to clean up and unload classes to decrease
48        // class verification time in debug vm
49        System.gc();
50    }
51
52    private static void runGrowing(long time, int iterations) {
53        long startTime = System.currentTimeMillis();
54        for (int i = 0; System.currentTimeMillis() < startTime + time && i < iterations; ++i) {
55            try {
56                GeneratedClassLoader gcl = new GeneratedClassLoader();
57
58                // getGeneratedClasses throws a RuntimeException in cases where
59                // the javac exit code is not 0. If the original reason for the exception is
60                // a "java.lang.OutOfMemoryError: Java heap space",
61                // increase the heap size in the @run tag and rerun the test.
62                // The heap can be exhausted by this test, but heap exhaustion
63                // is not a failure mode of this test and should be ignored.
64                c = gcl.getGeneratedClasses(i, 100)[0];
65                c.newInstance();
66                c = null;
67
68                gcl = null;
69            } catch (IOException | InstantiationException | IllegalAccessException ex) {
70                throw new RuntimeException(ex);
71            }
72        }
73    }
74}
75