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test/gc/arguments/TestSelectDefaultGC.java

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  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 boolean versionStringContains(OutputAnalyzer output, String pattern) {
  40         Matcher matcher = Pattern.compile(pattern, Pattern.MULTILINE).matcher(output.getStderr());
  41         return matcher.find();
  42     }
  43 
  44     public static void assertVMOption(OutputAnalyzer output, String option, boolean value) {
  45         output.shouldMatch(" " + option + " .*=.* " + value + " ");
  46     }
  47 
  48     public static void main(String[] args) throws Exception {
  49         // Start VM without specifying GC
  50         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintFlagsFinal", "-version");
  51         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  52         output.shouldHaveExitValue(0);
  53 
  54         boolean isServerVM = versionStringContains(output, "Server VM");

  55 
  56         // Verify GC selection
  57         assertVMOption(output, "UseParallelGC",      isServerVM);
  58         assertVMOption(output, "UseParallelOldGC",   isServerVM);




  59         assertVMOption(output, "UseSerialGC",        !isServerVM);
  60         assertVMOption(output, "UseConcMarkSweepGC", false);
  61         assertVMOption(output, "UseG1GC",            false);
  62         assertVMOption(output, "UseParNewGC",        false);
  63     }
  64 }


  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 }
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