/* * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 8022865 * @summary Tests for different combination of UseCompressedOops options * @library /test/lib * @modules java.base/jdk.internal.misc * java.management * @build sun.hotspot.WhiteBox * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. UseCompressedOops */ import java.util.ArrayList; import java.util.Collections; import jdk.test.lib.Platform; import jdk.test.lib.process.ProcessTools; import jdk.test.lib.process.OutputAnalyzer; import sun.hotspot.gc.GC; import sun.hotspot.code.Compiler; public class UseCompressedOops { public static void main(String[] args) throws Exception { testCompressedOopsModesGCs(); testCompressedOopsModesGCs("-XX:+UseLargePages"); } public static void testCompressedOopsModesGCs(String... flags) throws Exception { ArrayList args = new ArrayList<>(); Collections.addAll(args, flags); // Test default. testCompressedOopsModes(args); // Test GCs. testCompressedOopsModes(args, "-XX:+UseG1GC"); if (!Compiler.isGraalEnabled()) { // Graal does not support CMS testCompressedOopsModes(args, "-XX:+UseConcMarkSweepGC"); } testCompressedOopsModes(args, "-XX:+UseSerialGC"); testCompressedOopsModes(args, "-XX:+UseParallelGC"); testCompressedOopsModes(args, "-XX:+UseParallelOldGC"); if (GC.Shenandoah.isSupported()) { testCompressedOopsModes(args, "-XX:+UseShenandoahGC"); } } public static void testCompressedOopsModes(ArrayList flags1, String... flags2) throws Exception { ArrayList args = new ArrayList<>(); args.addAll(flags1); Collections.addAll(args, flags2); if (Platform.is64bit()) { // Explicitly turn of compressed oops testCompressedOops(args, "-XX:-UseCompressedOops", "-Xmx32m") .shouldNotContain("Compressed Oops") .shouldHaveExitValue(0); // Compressed oops should be on by default testCompressedOops(args, "-Xmx32m") .shouldContain("Compressed Oops mode") .shouldHaveExitValue(0); // Explicly enabling compressed oops testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m") .shouldContain("Compressed Oops mode") .shouldHaveExitValue(0); // Skip the following three test cases if we're on OSX or Solaris. // // OSX doesn't seem to care about HeapBaseMinAddress and Solaris // puts the heap way up, forcing different behaviour. if (!Platform.isOSX() && !Platform.isSolaris()) { // Larger than 4gb heap should result in zero based with shift 3 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx5g") .shouldContain("Zero based") .shouldContain("Oop shift amount: 3") .shouldHaveExitValue(0); // Larger than 3gb heap and HeapBaseMinAddress=1g should result in zero based with shift 3 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx3200m", "-XX:HeapBaseMinAddress=1g") .shouldContain("Zero based") .shouldContain("Oop shift amount: 3") .shouldHaveExitValue(0); // Small heap above 4gb should result in zero based with shift 3 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=4g") .shouldContain("Zero based") .shouldContain("Oop shift amount: 3") .shouldHaveExitValue(0); // Small heap above 32gb should result in non-zero based with shift 3 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=32g") .shouldContain("Non-zero disjoint base") .shouldContain("Oop shift amount: 3") .shouldHaveExitValue(0); // Small heap above 32gb should result in non-zero based with shift 3 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m", "-XX:HeapBaseMinAddress=72704m") .shouldContain("Non-zero based") .shouldContain("Oop shift amount: 3") .shouldHaveExitValue(0); // 32gb heap with heap base above 64gb and object alignment set to 16 bytes should result // in non-zero based with shift 4 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=16", "-XX:HeapBaseMinAddress=64g") .shouldContain("Non-zero disjoint base") .shouldContain("Oop shift amount: 4") .shouldHaveExitValue(0); // 32gb heap with object alignment set to 16 bytes should result in zero based with shift 4 testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=16") .shouldContain("Zero based") .shouldContain("Oop shift amount: 4") .shouldHaveExitValue(0); } // This is a pathologic case for the heap allocation algorithm. Regression test. // HeapBaseMinAddress must be 2g and should not be set on the command line. testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx2g") .shouldNotContain("Max heap size too large for Compressed Oops") .shouldHaveExitValue(0); testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx29g", "-XX:CompressedClassSpaceSize=1g") .shouldNotContain("Max heap size too large for Compressed Oops") .shouldHaveExitValue(0); // Explicitly enabling compressed oops with 32gb heap should result a warning testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g") .shouldContain("Max heap size too large for Compressed Oops") .shouldHaveExitValue(0); // 32gb heap should not result a warning testCompressedOops(args, "-Xmx32g") .shouldNotContain("Max heap size too large for Compressed Oops") .shouldHaveExitValue(0); // Explicitly enabling compressed oops with 32gb heap and object // alignment set to 8 byte should result a warning testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32g", "-XX:ObjectAlignmentInBytes=8") .shouldContain("Max heap size too large for Compressed Oops") .shouldHaveExitValue(0); // 64gb heap and object alignment set to 16 bytes should result in a warning testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx64g", "-XX:ObjectAlignmentInBytes=16") .shouldContain("Max heap size too large for Compressed Oops") .shouldHaveExitValue(0); } else { // Compressed oops should only apply to 64bit platforms testCompressedOops(args, "-XX:+UseCompressedOops", "-Xmx32m") .shouldContain("Unrecognized VM option 'UseCompressedOops'") .shouldHaveExitValue(1); } } private static OutputAnalyzer testCompressedOops(ArrayList flags1, String... flags2) throws Exception { ArrayList args = new ArrayList<>(); // Always run with these three: args.add("-XX:+PrintCompressedOopsMode"); args.add("-Xms32m"); // Add the extra flags args.addAll(flags1); Collections.addAll(args, flags2); args.add("-version"); ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0])); return new OutputAnalyzer(pb.start()); } }