1 /*
2 * Copyright (c) 2002, 2018, 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 * @key stress gc
27 *
28 * @summary converted from VM Testbase gc/gctests/LoadUnloadGC.
29 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, monitoring]
30 * VM Testbase readme:
31 * In this test a 1000 classes are loaded and unloaded in a loop.
32 * Class0 gets loaded which results in Class1 getting loaded and so on all
33 * the way uptill class1000. The classes should be unloaded whenever a
34 * garbage collection takes place because their classloader is made unreachable
35 * at the end of the each loop iteration. The loop is repeated 1000 times.
36 *
37 * @library /vmTestbase
38 * /test/lib
39 * @run driver jdk.test.lib.FileInstaller . .
40 * @build nsk.share.gc.ClassChain
41 * @run main/othervm
42 * -XX:MaxMetaspaceSize=64M
43 * -XX:MetaspaceSize=32M
44 * -XX:CompressedClassSpaceSize=32M
45 * gc.gctests.LoadUnloadGC.LoadUnloadGC
46 */
47
48 package gc.gctests.LoadUnloadGC;
49
50 import nsk.share.test.*;
51 import nsk.share.gc.*;
52 import nsk.share.classload.ClassPathNonDelegatingClassLoader;
53 import vm.share.monitoring.MemoryPoolFinder;
54
55 import java.io.*;
56 import java.util.*;
57 import java.lang.management.MemoryPoolMXBean;
58
59 /**
60 * This test checks that classes are unloaded when loaded multiple times
61 * with custom class loader.
62 */
63 public class LoadUnloadGC extends ThreadedGCTest {
64 private final String className = "nsk.share.gc.ClassChain";
65 private int [] memory_reserve = new int[10000];
66
67 private class Loader implements Runnable {
68 private Class class_zero_class;
69 private Object class_zero_object;
70
71 public void run() {
72 try {
73 // load Class0 and instantiate it
74 // This will cause all thousand classes to get loaded
75 ClassPathNonDelegatingClassLoader loader = new ClassPathNonDelegatingClassLoader();
76 class_zero_class = loader.loadClass(className, false);
77 class_zero_object = class_zero_class.newInstance();
78 // Set all references to null . This should cause a GC
79 // which should forces an unloading of all these
80 // unreferenced classes.
81 class_zero_class = null;
82 class_zero_object = null;
83 loader = null;
84 } catch (ClassNotFoundException e) {
85 throw new RuntimeException(e);
86 } catch (InstantiationException e) {
87 throw new RuntimeException(e);
88 } catch (IllegalAccessException e) {
89 throw new RuntimeException(e);
90 }
91 }
92 }
93
94 protected Runnable createRunnable(int i) {
95 return new Loader();
96 }
97
98 protected static int getThreadCount() {
99 MemoryPoolMXBean bean = MemoryPoolFinder.findPool(MemoryPoolFinder.METASPACE);
100 ClassPathNonDelegatingClassLoader loader = new ClassPathNonDelegatingClassLoader();
101 long used = bean.getUsage().getUsed();
102 long free = 0;
103 int classesCount = 1000;
104 int classesToLoad = 10;
105 if(bean.getUsage().getMax() == -1) {
106 throw new RuntimeException("Metaspace size should be limited for this test.");
107 }
108 try {
109 for(int i = 1; i <= classesToLoad; i++) {
110 loader.loadClass("nsk.share.gc.Class"+i);
111 }
112 } catch (Exception e) {
113 throw new RuntimeException(e);
114 }
115 used = bean.getUsage().getUsed() - used;
116 free = (bean.getUsage().getMax() - bean.getUsage().getUsed())/2;
117 return Math.min((int)(0.95*free/(classesCount/classesToLoad*used)),
118 Runtime.getRuntime().availableProcessors());
119 }
120
121 public static void main(String args[]) {
122 int threadCount = getThreadCount();
123 if (Arrays.binarySearch(args,"-t") < 0) {
124 args = Arrays.copyOf(args,args.length+2);
125 args[args.length-2] = "-t";
126 args[args.length-1] = Integer.toString(threadCount);
127 }
128 GC.runTest(new LoadUnloadGC(), args);
129 }
130 }