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 TestShrinkDefragmentedHeap
26 * @bug 8038423
27 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects
28 * 1. allocate small objects mixed with humongous ones
29 * "ssssHssssHssssHssssHssssHssssHssssH"
30 * 2. release all allocated object except the last humongous one
31 * "..................................H"
32 * 3. invoke gc and check that memory returned to the system (amount of committed memory got down)
33 *
34 * @library /testlibrary
35 */
36 import java.lang.management.ManagementFactory;
37 import java.lang.management.MemoryUsage;
38 import java.util.ArrayList;
39 import java.util.List;
40 import sun.management.ManagementFactoryHelper;
41 import static com.oracle.java.testlibrary.Asserts.*;
42 import com.oracle.java.testlibrary.ProcessTools;
43 import com.oracle.java.testlibrary.OutputAnalyzer;
44
45 public class TestShrinkDefragmentedHeap {
46 // Since we store all the small objects, they become old and old regions are also allocated at the bottom of the heap
47 // together with humongous regions. So if there are a lot of old regions in the lower part of the heap,
48 // the humongous regions will be allocated in the upper part of the heap anyway.
49 // To avoid this the Eden needs to be big enough to fit all the small objects.
50 private static final int INITIAL_HEAP_SIZE = 200 * 1024 * 1024;
51 private static final int MINIMAL_YOUNG_SIZE = 190 * 1024 * 1024;
52 private static final int REGION_SIZE = 1 * 1024 * 1024;
53
54 public static void main(String[] args) throws Exception, Throwable {
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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 TestShrinkDefragmentedHeap
26 * @bug 8038423
27 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects
28 * 1. allocate small objects mixed with humongous ones
29 * "ssssHssssHssssHssssHssssHssssHssssH"
30 * 2. release all allocated object except the last humongous one
31 * "..................................H"
32 * 3. invoke gc and check that memory returned to the system (amount of committed memory got down)
33 *
34 * @library /testlibrary
35 * @build com.oracle.java.testlibrary.*
36 * @run main/othervm TestShrinkDefragmentedHeap
37 */
38 import java.lang.management.ManagementFactory;
39 import java.lang.management.MemoryUsage;
40 import java.util.ArrayList;
41 import java.util.List;
42 import sun.management.ManagementFactoryHelper;
43 import static com.oracle.java.testlibrary.Asserts.*;
44 import com.oracle.java.testlibrary.ProcessTools;
45 import com.oracle.java.testlibrary.OutputAnalyzer;
46
47 public class TestShrinkDefragmentedHeap {
48 // Since we store all the small objects, they become old and old regions are also allocated at the bottom of the heap
49 // together with humongous regions. So if there are a lot of old regions in the lower part of the heap,
50 // the humongous regions will be allocated in the upper part of the heap anyway.
51 // To avoid this the Eden needs to be big enough to fit all the small objects.
52 private static final int INITIAL_HEAP_SIZE = 200 * 1024 * 1024;
53 private static final int MINIMAL_YOUNG_SIZE = 190 * 1024 * 1024;
54 private static final int REGION_SIZE = 1 * 1024 * 1024;
55
56 public static void main(String[] args) throws Exception, Throwable {
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