1 /* 2 * Copyright (c) 2015, 2019, 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 package gc.arguments; 25 26 /* 27 * @test TestSelectDefaultGC 28 * @summary Test selection of GC when no GC option is specified 29 * @bug 8068582 30 * @key gc 31 * @library /test/lib 32 * @library / 33 * @requires vm.gc.Serial & vm.gc.G1 34 * @modules java.base/jdk.internal.misc 35 * java.management 36 * @run driver gc.arguments.TestSelectDefaultGC 37 */ 38 39 import jdk.test.lib.process.OutputAnalyzer; 40 import jdk.test.lib.process.ProcessTools; 41 42 public class TestSelectDefaultGC { assertVMOption(OutputAnalyzer output, String option, boolean value)43 public static void assertVMOption(OutputAnalyzer output, String option, boolean value) { 44 output.shouldMatch(" " + option + " .*=.* " + value + " "); 45 } 46 testDefaultGC(boolean actAsServer)47 public static void testDefaultGC(boolean actAsServer) throws Exception { 48 String[] args = new String[] { 49 "-XX:" + (actAsServer ? "+" : "-") + "AlwaysActAsServerClassMachine", 50 "-XX:" + (actAsServer ? "-" : "+") + "NeverActAsServerClassMachine", 51 "-XX:+PrintFlagsFinal", 52 "-version" 53 }; 54 55 // Start VM without specifying GC 56 ProcessBuilder pb = GCArguments.createJavaProcessBuilder(args); 57 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 58 output.shouldHaveExitValue(0); 59 60 final boolean isServer = actAsServer; 61 62 // Verify GC selection 63 // G1 is default for server class machines 64 assertVMOption(output, "UseG1GC", isServer); 65 // Serial is default for non-server class machines 66 assertVMOption(output, "UseSerialGC", !isServer); 67 } 68 main(String[] args)69 public static void main(String[] args) throws Exception { 70 // Test server class machine 71 testDefaultGC(false); 72 73 // Test non-server class machine 74 testDefaultGC(true); 75 } 76 } 77