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.
   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
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  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
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  23 
  24 /*
  25  * @test TestDynamicNumberOfGCThreads
  26  * @bug 8017462
  27  * @summary Ensure that UseDynamicNumberOfGCThreads runs
  28  * @requires vm.gc=="null"
  29  * @key gc
  30  * @modules java.base/jdk.internal.misc
  31  * @library /test/lib
  32  * @build sun.hotspot.WhiteBox
  33  * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
  34  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestDynamicNumberOfGCThreads
  35  */
  36 
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 import jdk.test.lib.process.ProcessTools;
  39 import sun.hotspot.gc.GC;
  40 
  41 public class TestDynamicNumberOfGCThreads {
  42   public static void main(String[] args) throws Exception {
  43 
  44     testDynamicNumberOfGCThreads("UseConcMarkSweepGC");
  45 
  46     testDynamicNumberOfGCThreads("UseG1GC");
  47 
  48     testDynamicNumberOfGCThreads("UseParallelGC");
  49 
  50     if (GC.Shenandoah.isSupported()) {
  51         testDynamicNumberOfGCThreads("UseShenandoahGC");
  52     }
  53   }
  54 
  55   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
  56     output.shouldHaveExitValue(0); // test should run succesfully
  57     output.shouldContain("new_active_workers");
  58   }
  59 
  60   private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception {
  61     // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
  62     String[] baseArgs = {"-XX:+UnlockExperimentalVMOptions", "-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()};
  63 
  64     // Base test with gc and +UseDynamicNumberOfGCThreads:
  65     ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs);
  66     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  67 
  68     // Ensure it also works on uniprocessors or if user specifies -XX:ParallelGCThreads=1:
  69     String[] extraArgs = {"-XX:+UnlockDiagnosticVMOptions", "-XX:+ForceDynamicNumberOfGCThreads", "-XX:ParallelGCThreads=1"};
  70     String[] finalArgs = new String[baseArgs.length + extraArgs.length];
  71     System.arraycopy(extraArgs, 0, finalArgs, 0,                extraArgs.length);
  72     System.arraycopy(baseArgs,  0, finalArgs, extraArgs.length, baseArgs.length);
  73     pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs);
  74     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  75 
  76     // Turn on parallel reference processing
  77     String[] parRefProcArg = {"-XX:+ParallelRefProcEnabled", "-XX:-ShowMessageBoxOnError"};
  78     String[] parRefArgs = new String[baseArgs.length + parRefProcArg.length];
  79     System.arraycopy(parRefProcArg, 0, parRefArgs, 0,                parRefProcArg.length);
  80     System.arraycopy(baseArgs,  0, parRefArgs, parRefProcArg.length, baseArgs.length);
  81     pb_enabled = ProcessTools.createJavaProcessBuilder(parRefArgs);
  82     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  83   }
  84 
  85   static class GCTest {
  86     private static byte[] garbage;
  87     public static void main(String [] args) {
  88       System.out.println("Creating garbage");
  89       // create 128MB of garbage. This should result in at least one GC
  90       for (int i = 0; i < 1024; i++) {
  91         garbage = new byte[128 * 1024];
  92       }
  93       System.out.println("Done");
  94     }
  95   }
  96 }