1 /*
2 * Copyright (c) 2016, 2019, 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 */
32 * @bug 8151499 8153734
33 * @modules java.base/jdk.internal.vm.annotation
34 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseParallelGC -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
35 */
36
37 /*
38 * @test TestHumongousReferenceObjectG1
39 * @summary Test that verifies that iteration over large, plain Java objects, that potentially cross region boundaries on G1, with references in them works.
40 * @requires vm.gc.G1
41 * @bug 8151499 8153734
42 * @modules java.base/jdk.internal.vm.annotation
43 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=1M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
44 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=2M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
45 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
46 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
47 */
48
49 /*
50 * @test TestHumongousReferenceObjectShenandoah
51 * @summary Test that verifies that iteration over large, plain Java objects, that potentially cross region boundaries, with references in them works.
52 * @requires vm.gc.Shenandoah & !vm.graal.enabled
53 * @bug 8151499 8153734
54 * @modules java.base/jdk.internal.vm.annotation
55 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xms128m -Xmx128m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahRegionSize=8M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
56 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xms128m -Xmx128m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahRegionSize=8M -XX:ContendedPaddingWidth=8192 -XX:+UnlockDiagnosticVMOptions -XX:+ShenandoahVerify gc.TestHumongousReferenceObject
57 */
58 public class TestHumongousReferenceObject {
59
60 /*
61 Due to 300 fields with 8K @Contended padding around each field, it takes 2.4M bytes per instance.
62 With small G1 regions, it is bound to cross regions. G1 should properly (card) mark the object nevertheless.
63 With 128M heap, it is enough to allocate ~100 of these objects to provoke at least one GC.
64 */
65
66 static volatile Object instance;
67
68 public static void main(String[] args) {
69 for (int c = 0; c < 100; c++) {
70 instance = new TestHumongousReferenceObject();
71 }
72 }
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1 /*
2 * Copyright (c) 2016, 2020, 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 */
32 * @bug 8151499 8153734
33 * @modules java.base/jdk.internal.vm.annotation
34 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseParallelGC -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
35 */
36
37 /*
38 * @test TestHumongousReferenceObjectG1
39 * @summary Test that verifies that iteration over large, plain Java objects, that potentially cross region boundaries on G1, with references in them works.
40 * @requires vm.gc.G1
41 * @bug 8151499 8153734
42 * @modules java.base/jdk.internal.vm.annotation
43 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=1M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
44 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=2M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
45 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
46 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
47 */
48
49 /*
50 * @test TestHumongousReferenceObjectShenandoah
51 * @summary Test that verifies that iteration over large, plain Java objects, that potentially cross region boundaries, with references in them works.
52 * @requires vm.gc.Shenandoah
53 * @bug 8151499 8153734
54 * @modules java.base/jdk.internal.vm.annotation
55 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xms128m -Xmx128m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahRegionSize=8M -XX:ContendedPaddingWidth=8192 gc.TestHumongousReferenceObject
56 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xms128m -Xmx128m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahRegionSize=8M -XX:ContendedPaddingWidth=8192 -XX:+UnlockDiagnosticVMOptions -XX:+ShenandoahVerify gc.TestHumongousReferenceObject
57 */
58 public class TestHumongousReferenceObject {
59
60 /*
61 Due to 300 fields with 8K @Contended padding around each field, it takes 2.4M bytes per instance.
62 With small G1 regions, it is bound to cross regions. G1 should properly (card) mark the object nevertheless.
63 With 128M heap, it is enough to allocate ~100 of these objects to provoke at least one GC.
64 */
65
66 static volatile Object instance;
67
68 public static void main(String[] args) {
69 for (int c = 0; c < 100; c++) {
70 instance = new TestHumongousReferenceObject();
71 }
72 }
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