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  * @ignore 8148239
  33  * @run driver TestSelectDefaultGC
  34  */
  35 
  36 import jdk.test.lib.*;
  37 import java.util.regex.*;
  38 
  39 public class TestSelectDefaultGC {
  40     public static void assertVMOption(OutputAnalyzer output, String option, boolean value) {
  41         output.shouldMatch(" " + option + " .*=.* " + value + " ");
  42     }
  43 
  44     public static void main(String[] args) throws Exception {
  45         // Start VM without specifying GC
  46         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintFlagsFinal", "-version");
  47         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  48         output.shouldHaveExitValue(0);
  49 
  50         boolean isServerVM = Platform.isServer();
  51         boolean isEmbeddedVM = Platform.isEmbedded();
  52 
  53         // Verify GC selection
  54         // G1 is default for non-embedded server VMs
  55         assertVMOption(output, "UseG1GC",            isServerVM && !isEmbeddedVM);
  56         // Parallel is default for embedded server VMs
  57         assertVMOption(output, "UseParallelGC",      isServerVM && isEmbeddedVM);
  58         assertVMOption(output, "UseParallelOldGC",   isServerVM && isEmbeddedVM);
  59         // Serial is default for non-server VMs
  60         assertVMOption(output, "UseSerialGC",        !isServerVM);
  61         assertVMOption(output, "UseConcMarkSweepGC", false);
  62         assertVMOption(output, "UseParNewGC",        false);
  63     }
  64 }