1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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  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).
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  23 
  24 /*
  25  * @test TestSelectDefaultGC
  26  * @summary Test selection of GC when no GC option is specified
  27  * @bug 8068582
  28  * @ignore 8148239
  29  * @key gc
  30  * @library /testlibrary
  31  * @modules java.base/sun.misc
  32  *          java.management
  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 }