1 /*
   2  * Copyright (c) 2015, 2019, 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 package gc.ergonomics;
  25 
  26 /*
  27  * @test TestDynamicNumberOfGCThreads
  28  * @bug 8017462
  29  * @summary Ensure that UseDynamicNumberOfGCThreads runs
  30  * @requires vm.gc.Parallel & vm.gc.G1 & vm.gc.ConcMarkSweep
  31  * @key gc
  32  * @modules java.base/jdk.internal.misc
  33  * @library /test/lib
  34  * @build sun.hotspot.WhiteBox
  35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
  36  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI gc.ergonomics.TestDynamicNumberOfGCThreads
  37  */
  38 
  39 import jdk.test.lib.process.OutputAnalyzer;
  40 import jdk.test.lib.process.ProcessTools;
  41 import sun.hotspot.gc.GC;
  42 
  43 public class TestDynamicNumberOfGCThreads {
  44   public static void main(String[] args) throws Exception {
  45 
  46     testDynamicNumberOfGCThreads("UseConcMarkSweepGC");
  47 
  48     testDynamicNumberOfGCThreads("UseG1GC");
  49 
  50     testDynamicNumberOfGCThreads("UseParallelGC");
  51 
  52     if (GC.Shenandoah.isSupported()) {
  53         testDynamicNumberOfGCThreads("UseShenandoahGC");
  54     }
  55   }
  56 
  57   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
  58     output.shouldHaveExitValue(0); // test should run succesfully
  59     output.shouldContain("new_active_workers");
  60   }
  61 
  62   private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception {
  63     // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
  64     String[] baseArgs = {"-XX:+UnlockExperimentalVMOptions", "-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()};
  65 
  66     // Base test with gc and +UseDynamicNumberOfGCThreads:
  67     ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs);
  68     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  69 
  70     // Ensure it also works on uniprocessors or if user specifies -XX:ParallelGCThreads=1:
  71     String[] extraArgs = {"-XX:+UnlockDiagnosticVMOptions", "-XX:+ForceDynamicNumberOfGCThreads", "-XX:ParallelGCThreads=1"};
  72     String[] finalArgs = new String[baseArgs.length + extraArgs.length];
  73     System.arraycopy(extraArgs, 0, finalArgs, 0,                extraArgs.length);
  74     System.arraycopy(baseArgs,  0, finalArgs, extraArgs.length, baseArgs.length);
  75     pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs);
  76     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  77 
  78     // Turn on parallel reference processing
  79     String[] parRefProcArg = {"-XX:+ParallelRefProcEnabled", "-XX:-ShowMessageBoxOnError"};
  80     String[] parRefArgs = new String[baseArgs.length + parRefProcArg.length];
  81     System.arraycopy(parRefProcArg, 0, parRefArgs, 0,                parRefProcArg.length);
  82     System.arraycopy(baseArgs,  0, parRefArgs, parRefProcArg.length, baseArgs.length);
  83     pb_enabled = ProcessTools.createJavaProcessBuilder(parRefArgs);
  84     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  85   }
  86 
  87   static class GCTest {
  88     private static byte[] garbage;
  89     public static void main(String [] args) {
  90       System.out.println("Creating garbage");
  91       // create 128MB of garbage. This should result in at least one GC
  92       for (int i = 0; i < 1024; i++) {
  93         garbage = new byte[128 * 1024];
  94       }
  95       System.out.println("Done");
  96     }
  97   }
  98 }