1 /* 2 * Copyright (c) 2015, 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 TestSelectDefaultGC 26 * @summary Test selection of GC when no GC option is specified 27 * @bug 8068582 28 * @key gc 29 * @library /testlibrary 30 * @modules java.base/sun.misc 31 * java.management 32 * @run driver TestSelectDefaultGC 33 */ 34 35 import jdk.test.lib.*; 36 import java.util.regex.*; 37 38 public class TestSelectDefaultGC { 39 public static void assertVMOption(OutputAnalyzer output, String option, boolean value) { 40 output.shouldMatch(" " + option + " .*=.* " + value + " "); 41 } 42 43 public static void main(String[] args) throws Exception { 44 // Start VM without specifying GC 45 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintFlagsFinal", "-version"); 46 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 47 output.shouldHaveExitValue(0); 48 49 boolean isServerVM = Platform.isServer(); 50 boolean isEmbeddedVM = Platform.isEmbedded(); 51 52 // Verify GC selection 53 // G1 is default for non-embedded server VMs 54 assertVMOption(output, "UseG1GC", isServerVM && !isEmbeddedVM); 55 // Parallel is default for embedded server VMs 56 assertVMOption(output, "UseParallelGC", isServerVM && isEmbeddedVM); 57 assertVMOption(output, "UseParallelOldGC", isServerVM && isEmbeddedVM); 58 // Serial is default for non-server VMs 59 assertVMOption(output, "UseSerialGC", !isServerVM); 60 assertVMOption(output, "UseConcMarkSweepGC", false); 61 assertVMOption(output, "UseParNewGC", false); 62 } 63 }