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 * @ignore 8019361
26 * @test TestDynShrinkHeap
27 * @bug 8016479
28 * @requires vm.gc=="Parallel" | vm.gc=="null"
29 * @summary Verify that the heap shrinks after full GC according to the current values of the Min/MaxHeapFreeRatio flags
30 * @library /testlibrary
31 * @run main/othervm -XX:+UseAdaptiveSizePolicyWithSystemGC -XX:+UseParallelGC -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 -Xmx1g -verbose:gc TestDynShrinkHeap
32 */
33 import com.oracle.java.testlibrary.DynamicVMOption;
34 import java.lang.management.ManagementFactory;
35 import java.lang.management.MemoryUsage;
36 import java.util.ArrayList;
37 import sun.management.ManagementFactoryHelper;
38 import static com.oracle.java.testlibrary.Asserts.*;
39
40 public class TestDynShrinkHeap {
41
42 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
43 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
44
45 private static ArrayList<byte[]> list = new ArrayList<>(0);
46 private static final int LEN = 512 * 1024 + 1;
47
48 public TestDynShrinkHeap() {
49 }
50
51 private final void test() {
52 System.gc();
53 MemoryUsagePrinter.printMemoryUsage("init");
54
55 eat();
56 MemoryUsagePrinter.printMemoryUsage("eaten");
57 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
58
59 free();
60 MemoryUsagePrinter.printMemoryUsage("free");
61 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
62
63 assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format(
64 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
65 + "%s = %s%n%s = %s",
66 MIN_FREE_RATIO_FLAG_NAME,
67 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
68 MAX_FREE_RATIO_FLAG_NAME,
69 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
70 ));
71 }
72
73 private void eat() {
74 for (int i = 0; i < LEN; i++) {
75 list.add(new byte[1024]);
76 }
77 MemoryUsagePrinter.printMemoryUsage("allocated " + LEN + " arrays");
78
79 list.subList(0, LEN / 2).clear();
80 System.gc();
81 MemoryUsagePrinter.printMemoryUsage("array halved");
82 }
83
|
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 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 sun.management.ManagementFactoryHelper;
37 import com.oracle.java.testlibrary.Asserts;
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();
57
58 free();
59 MemoryUsagePrinter.printMemoryUsage("free");
60 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
61
62 Asserts.assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format(
63 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
64 + "%s = %s%n%s = %s",
65 MIN_FREE_RATIO_FLAG_NAME,
66 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
67 MAX_FREE_RATIO_FLAG_NAME,
68 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
69 ));
70 }
71
72 private void eat() {
73 for (int i = 0; i < LEN; i++) {
74 list.add(new byte[1024]);
75 }
76 MemoryUsagePrinter.printMemoryUsage("allocated " + LEN + " arrays");
77
78 list.subList(0, LEN / 2).clear();
79 System.gc();
80 MemoryUsagePrinter.printMemoryUsage("array halved");
81 }
82
|