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 TestDynShrinkHeap
  26  * @bug 8016479
  27  * @requires vm.gc=="Parallel" | vm.gc=="null"
  28  * @summary Verify that the heap shrinks after full GC according to the current values of the Min/MaxHeapFreeRatio flags
  29  * @library /testlibrary
  30  * @run main/othervm -XX:+UseAdaptiveSizePolicyWithSystemGC -XX:+UseParallelGC -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 -Xmx1g -verbose:gc TestDynShrinkHeap
  31  */
  32 import com.oracle.java.testlibrary.DynamicVMOption;
  33 import java.lang.management.ManagementFactory;
  34 import java.lang.management.MemoryUsage;
  35 import java.util.ArrayList;
  36 import static com.oracle.java.testlibrary.Asserts.assertLessThan;
  37 import com.sun.management.HotSpotDiagnosticMXBean;
  38 
  39 public class TestDynShrinkHeap {
  40 
  41     public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
  42     public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
  43 
  44     private static ArrayList<byte[]> list = new ArrayList<>(0);
  45     private static final int LEN = 512 * 1024 + 1;
  46 
  47     public TestDynShrinkHeap() {
  48     }
  49 
  50     private final void test() {
  51         System.gc();
  52         MemoryUsagePrinter.printMemoryUsage("init");
  53 
  54         eat();
  55         MemoryUsagePrinter.printMemoryUsage("eaten");
  56         MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();

  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 TestDynShrinkHeap
  26  * @bug 8016479
  27  * @requires vm.gc=="Parallel" | vm.gc=="null"
  28  * @summary Verify that the heap shrinks after full GC according to the current values of the Min/MaxHeapFreeRatio flags
  29  * @library /testlibrary
  30  * @run main/othervm -XX:+UseAdaptiveSizePolicyWithSystemGC -XX:+UseParallelGC -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 -Xmx1g -verbose:gc TestDynShrinkHeap
  31  */
  32 import jdk.test.lib.DynamicVMOption;
  33 import java.lang.management.ManagementFactory;
  34 import java.lang.management.MemoryUsage;
  35 import java.util.ArrayList;
  36 import static jdk.test.lib.Asserts.assertLessThan;
  37 import com.sun.management.HotSpotDiagnosticMXBean;
  38 
  39 public class TestDynShrinkHeap {
  40 
  41     public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
  42     public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
  43 
  44     private static ArrayList<byte[]> list = new ArrayList<>(0);
  45     private static final int LEN = 512 * 1024 + 1;
  46 
  47     public TestDynShrinkHeap() {
  48     }
  49 
  50     private final void test() {
  51         System.gc();
  52         MemoryUsagePrinter.printMemoryUsage("init");
  53 
  54         eat();
  55         MemoryUsagePrinter.printMemoryUsage("eaten");
  56         MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();