gc (original) (raw)

1 /* 2 * Copyright (c) 2016, 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 / 23 24 import jdk.internal.vm.annotation.Contended; 25 26 / 27 * @test 28 * @summary Test that verifies that iteration over large, plain Java objects, that potentially cross region boundaries on G1, with references in them works. 29 * @requires vm.gc == "null" 30 * @bug 8151499 8153734 31 * @modules java.base/jdk.internal.vm.annotation 32 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseParallelGC -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 33 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=1M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 34 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=2M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 35 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 36 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject

37 / 38 public class TestHumongousReferenceObject { 39 40 / 41 Due to 300 fields with 8K @Contended padding around each field, it takes 2.4M bytes per instance. 42 With small G1 regions, it is bound to cross regions. G1 should properly (card) mark the object nevertheless. 43 With 128M heap, it is enough to allocate ~100 of these objects to provoke at least one GC. 44 */ 45 46 static volatile Object instance; 47 48 public static void main(String[] args) { 49 for (int c = 0; c < 100; c++) { 50 instance = new TestHumongousReferenceObject(); 51 } 52 } 53 54 @Contended Integer int_1 = new Integer(1); 55 @Contended Integer int_2 = new Integer(2); 56 @Contended Integer int_3 = new Integer(3);

1 /* 2 * Copyright (c) 2016, 2018, 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 / 23 24 import jdk.internal.vm.annotation.Contended; 25 26 / 27 * @test 28 * @summary Test that verifies that iteration over large, plain Java objects, that potentially cross region boundaries on G1, with references in them works. 29 * @requires vm.gc == "null" 30 * @bug 8151499 8153734 31 * @modules java.base/jdk.internal.vm.annotation 32 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseParallelGC -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 33 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=1M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 34 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=2M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 35 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 36 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 37 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahHeapRegionSize=8M -XX:ContendedPaddingWidth=8192 TestHumongousReferenceObject 38 * @run main/othervm -XX:+EnableContended -XX:-RestrictContended -Xmx128m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahHeapRegionSize=8M -XX:ContendedPaddingWidth=8192 -XX:+UnlockDiagnosticVMOptions -XX:+ShenandoahVerify TestHumongousReferenceObject 39 / 40 public class TestHumongousReferenceObject { 41 42 / 43 Due to 300 fields with 8K @Contended padding around each field, it takes 2.4M bytes per instance. 44 With small G1 regions, it is bound to cross regions. G1 should properly (card) mark the object nevertheless. 45 With 128M heap, it is enough to allocate ~100 of these objects to provoke at least one GC. 46 */ 47 48 static volatile Object instance; 49 50 public static void main(String[] args) { 51 for (int c = 0; c < 100; c++) { 52 instance = new TestHumongousReferenceObject(); 53 } 54 } 55 56 @Contended Integer int_1 = new Integer(1); 57 @Contended Integer int_2 = new Integer(2); 58 @Contended Integer int_3 = new Integer(3);