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/*
* Copyright (c) 2015, 2017, 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 TestSelectDefaultGC
* @summary Test selection of GC when no GC option is specified
* @bug 8068582
* @key gc
* @library /test/lib
* @requires vm.gc=="null"
* @modules java.base/jdk.internal.misc
* java.management
* @run driver TestSelectDefaultGC
*/
import jdk.test.lib.Platform;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import java.util.regex.*;
public class TestSelectDefaultGC {
public static void assertVMOption(OutputAnalyzer output, String option, boolean value) {
output.shouldMatch(" " + option + " .*=.* " + value + " ");
}
public static void testDefaultGC(boolean actAsServer) throws Exception {
String[] args = new String[] {
"-XX:" + (actAsServer ? "+" : "-") + "AlwaysActAsServerClassMachine",
"-XX:" + (actAsServer ? "-" : "+") + "NeverActAsServerClassMachine",
"-XX:+PrintFlagsFinal",
"-version"
};
// Start VM without specifying GC
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args);
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
final boolean isServer = actAsServer;
// Verify GC selection
// G1 is default for server class machines
assertVMOption(output, "UseG1GC", isServer);
// Serial is default for non-server class machines
assertVMOption(output, "UseSerialGC", !isServer);
// CMS is never default
assertVMOption(output, "UseConcMarkSweepGC", false);
}
public static void main(String[] args) throws Exception {
// Test server class machine
testDefaultGC(false);
// Test non-server class machine
testDefaultGC(true);
}
}
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