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/*
* 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<String> 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:+UnlockExperimentalVMOptions", "-XX:+UseShenandoahGC");
}
}
public static void testCompressedOopsModes(ArrayList<String> flags1, String... flags2) throws Exception {
ArrayList<String> 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<String> flags1, String... flags2) throws Exception {
ArrayList<String> 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);
return new OutputAnalyzer(pb.start());
}
}
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