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 classes
27 * @build test.Empty
28 * @run main/othervm/timeout=200 FragmentMetaspaceSimple
29 */
30
31 import java.io.DataInputStream;
32 import java.io.File;
33 import java.io.FileInputStream;
34 import java.io.IOException;
35 import java.util.ArrayList;
36
37 /**
38 * Test that tries to fragment the native memory used by class loaders.
39 * Keeps every other class loader alive in order to fragment the memory space
40 * used to store classes and meta data. Since the memory is probably allocated in
41 * chunks per class loader this will cause a lot of fragmentation if not handled
42 * properly since every other chunk will be unused.
43 */
44 public class FragmentMetaspaceSimple {
45 public static void main(String... args) {
46 runSimple(Long.valueOf(System.getProperty("time", "80000")));
47 System.gc();
48 }
49
50 private static void runSimple(long time) {
51 long startTime = System.currentTimeMillis();
52 ArrayList<ClassLoader> cls = new ArrayList<>();
53 char sep = File.separatorChar;
54 String fileName = "classes" + sep + "test" + sep + "Empty.class";
55 File file = new File(System.getProperty("test.classes",".") + sep + fileName);
56 byte buff[] = read(file);
57
58 int i = 0;
59 for (i = 0; System.currentTimeMillis() < startTime + time; ++i) {
60 ClassLoader ldr = new MyClassLoader(buff);
61 if (i % 1000 == 0) {
62 cls.clear();
63 }
64 // only keep every other class loader alive
65 if (i % 2 == 1) {
66 cls.add(ldr);
67 }
68 Class<?> c = null;
69 try {
70 c = ldr.loadClass("test.Empty");
71 c.getClass().getClassLoader(); // make sure we have a valid class.
72 } catch (ClassNotFoundException ex) {
73 System.out.println("i=" + i + ", len" + buff.length);
74 throw new RuntimeException(ex);
75 }
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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 /test/lib classes
27 * @build test.Empty
28 * @run driver ClassFileInstaller test.Empty
29 * @run main/othervm/timeout=200 FragmentMetaspaceSimple
30 */
31
32 import java.io.DataInputStream;
33 import java.io.File;
34 import java.io.FileInputStream;
35 import java.io.IOException;
36 import java.util.ArrayList;
37
38 /**
39 * Test that tries to fragment the native memory used by class loaders.
40 * Keeps every other class loader alive in order to fragment the memory space
41 * used to store classes and meta data. Since the memory is probably allocated in
42 * chunks per class loader this will cause a lot of fragmentation if not handled
43 * properly since every other chunk will be unused.
44 */
45 public class FragmentMetaspaceSimple {
46 public static void main(String... args) {
47 runSimple(Long.valueOf(System.getProperty("time", "80000")));
48 System.gc();
49 }
50
51 private static void runSimple(long time) {
52 long startTime = System.currentTimeMillis();
53 ArrayList<ClassLoader> cls = new ArrayList<>();
54 char sep = File.separatorChar;
55 String fileName = "test" + sep + "Empty.class";
56 File file = new File(fileName);
57 byte buff[] = read(file);
58
59 int i = 0;
60 for (i = 0; System.currentTimeMillis() < startTime + time; ++i) {
61 ClassLoader ldr = new MyClassLoader(buff);
62 if (i % 1000 == 0) {
63 cls.clear();
64 }
65 // only keep every other class loader alive
66 if (i % 2 == 1) {
67 cls.add(ldr);
68 }
69 Class<?> c = null;
70 try {
71 c = ldr.loadClass("test.Empty");
72 c.getClass().getClassLoader(); // make sure we have a valid class.
73 } catch (ClassNotFoundException ex) {
74 System.out.println("i=" + i + ", len" + buff.length);
75 throw new RuntimeException(ex);
76 }
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