1 /* 2 * Copyright (c) 2014, 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 */ 23 24 /* 25 * @test 26 * @bug 8022865 27 * @summary Tests for different combination of UseCompressedOops options 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @build sun.hotspot.WhiteBox 32 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 33 * @run main/othervm/timeout=480 -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. UseCompressedOops 34 */ 35 import java.util.ArrayList; 36 import java.util.Collections; 37 import jdk.test.lib.Platform; 38 import jdk.test.lib.process.ProcessTools; 39 import jdk.test.lib.process.OutputAnalyzer; 40 import sun.hotspot.gc.GC; 41 42 import sun.hotspot.code.Compiler; 43 44 public class UseCompressedOops { 45 46 public static void main(String[] args) throws Exception { 47 testCompressedOopsModesGCs(); 48 if (!Platform.isOSX() && !Platform.isAix()) { 49 testCompressedOopsModesGCs("-XX:+UseLargePages"); 50 } 51 } 52 53 public static void testCompressedOopsModesGCs(String... flags) throws Exception { 54 ArrayList<String> args = new ArrayList<>(); 55 Collections.addAll(args, flags); 56 57 // Test default. 58 testCompressedOopsModes(args); 59 // Test GCs. 60 testCompressedOopsModes(args, "-XX:+UseG1GC"); 61 testCompressedOopsModes(args, "-XX:+UseSerialGC"); 62 testCompressedOopsModes(args, "-XX:+UseParallelGC"); 63 if (GC.Shenandoah.isSupported()) { 64 testCompressedOopsModes(args, "-XX:+UnlockExperimentalVMOptions", "-XX:+UseShenandoahGC"); 65 } 66 } 67 68 public static void testCompressedOopsModes(ArrayList<String> flags1, String... flags2) throws Exception { 69 ArrayList<String> args = new ArrayList<>(); 70 args.addAll(flags1); 71 Collections.addAll(args, flags2); 72 73 if (Platform.is64bit()) { 74 // Explicitly turn off compressed oops 75 testCompressedOops(args, "-XX:-UseCompressedOops", "-Xmx32m") 76 .shouldNotContain("Compressed Oops") 77 .shouldHaveExitValue(0); 78 79 // Compressed oops should be on by default 80 testCompressedOops(args, "-Xmx32m") 81 .shouldContain("Compressed Oops mode") 82 .shouldHaveExitValue(0); 83 84 // Explicly enabling compressed oops 85 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m") 86 .shouldContain("Compressed Oops mode") 87 .shouldHaveExitValue(0); 88 89 // Skip the following seven test cases if we're on OSX, Windows, or Solaris. 90 // 91 // OSX doesn't seem to care about HeapBaseMinAddress. Windows memory 92 // locations are affected by ASLR. Solaris puts the heap way up, 93 // forcing different behaviour. 94 if (!Platform.isOSX() && !Platform.isWindows() && !Platform.isSolaris()) { 95 96 // Larger than 4gb heap should result in zero based with shift 3 97 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx5g") 98 .shouldContain("Zero based") 99 .shouldContain("Oop shift amount: 3") 100 .shouldHaveExitValue(0); 101 102 // Larger than 3gb heap and HeapBaseMinAddress=1g should result in zero based with shift 3 103 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx3200m", "-XX:HeapBaseMinAddress=1g") 104 .shouldContain("Zero based") 105 .shouldContain("Oop shift amount: 3") 106 .shouldHaveExitValue(0); 107 108 // Small heap above 4gb should result in zero based with shift 3 109 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=4g") 110 .shouldContain("Zero based") 111 .shouldContain("Oop shift amount: 3") 112 .shouldHaveExitValue(0); 113 114 // Small heap above 32gb should result in non-zero based with shift 3 115 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=32g") 116 .shouldContain("Non-zero disjoint base") 117 .shouldContain("Oop shift amount: 3") 118 .shouldHaveExitValue(0); 119 120 // Small heap above 32gb should result in non-zero based with shift 3 121 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=72704m") 122 .shouldContain("Non-zero based") 123 .shouldContain("Oop shift amount: 3") 124 .shouldHaveExitValue(0); 125 126 // 32gb heap with heap base above 64gb and object alignment set to 16 bytes should result 127 // in non-zero based with shift 4 128 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=16", 129 "-XX:HeapBaseMinAddress=64g") 130 .shouldContain("Non-zero disjoint base") 131 .shouldContain("Oop shift amount: 4") 132 .shouldHaveExitValue(0); 133 134 // 32gb heap with object alignment set to 16 bytes should result in zero based with shift 4 135 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=16") 136 .shouldContain("Zero based") 137 .shouldContain("Oop shift amount: 4") 138 .shouldHaveExitValue(0); 139 } 140 141 // This is a pathologic case for the heap allocation algorithm. Regression test. 142 // HeapBaseMinAddress must be 2g and should not be set on the command line. 143 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx2g") 144 .shouldNotContain("Max heap size too large for Compressed Oops") 145 .shouldHaveExitValue(0); 146 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx29g", "-XX:CompressedClassSpaceSize=1g") 147 .shouldNotContain("Max heap size too large for Compressed Oops") 148 .shouldHaveExitValue(0); 149 150 // Explicitly enabling compressed oops with 32gb heap should result a warning 151 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g") 152 .shouldContain("Max heap size too large for Compressed Oops") 153 .shouldHaveExitValue(0); 154 155 // 32gb heap should not result a warning 156 testCompressedOops(args, "-Xmx32g") 157 .shouldNotContain("Max heap size too large for Compressed Oops") 158 .shouldHaveExitValue(0); 159 160 // Explicitly enabling compressed oops with 32gb heap and object 161 // alignment set to 8 byte should result a warning 162 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=8") 163 .shouldContain("Max heap size too large for Compressed Oops") 164 .shouldHaveExitValue(0); 165 166 // 64gb heap and object alignment set to 16 bytes should result in a warning 167 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx64g", "-XX:ObjectAlignmentInBytes=16") 168 .shouldContain("Max heap size too large for Compressed Oops") 169 .shouldHaveExitValue(0); 170 171 } else { 172 // Compressed oops should only apply to 64bit platforms 173 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m") 174 .shouldContain("Unrecognized VM option 'UseCompressedOops'") 175 .shouldHaveExitValue(1); 176 } 177 } 178 179 private static OutputAnalyzer testCompressedOops(ArrayList<String> flags1, String... flags2) throws Exception { 180 ArrayList<String> args = new ArrayList<>(); 181 182 // Always run with these two: 183 args.add("-Xlog:gc+heap+coops=trace"); 184 args.add("-Xms32m"); 185 186 // Add the extra flags 187 args.addAll(flags1); 188 Collections.addAll(args, flags2); 189 190 args.add("-version"); 191 192 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args); 193 return new OutputAnalyzer(pb.start()); 194 } 195 }