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 TestDynamicNumberOfGCThreads
  26  * @bug 8017462
  27  * @summary Ensure that UseDynamicNumberOfGCThreads runs
  28  * @requires vm.gc=="null"
  29  * @key gc
  30  * @library /testlibrary
  31  */
  32 
  33 import com.oracle.java.testlibrary.ProcessTools;
  34 import com.oracle.java.testlibrary.OutputAnalyzer;
  35 import java.util.ArrayList;
  36 import java.util.Arrays;
  37 import java.util.Collections;
  38 
  39 public class TestDynamicNumberOfGCThreads {
  40   public static void main(String[] args) throws Exception {
  41 
  42     testDynamicNumberOfGCThreads("UseConcMarkSweepGC", true);
  43     testDynamicNumberOfGCThreads("UseConcMarkSweepGC", false);
  44 
  45     testDynamicNumberOfGCThreads("UseG1GC", true);
  46     testDynamicNumberOfGCThreads("UseG1GC", false);
  47 
  48     testDynamicNumberOfGCThreads("UseParallelGC", true);
  49     testDynamicNumberOfGCThreads("UseParallelGC", false);
  50   }
  51 
  52   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
  53     output.shouldHaveExitValue(0); // test should run succesfully
  54     output.shouldContain("new_active_workers");
  55   }
  56 
  57   private static void testDynamicNumberOfGCThreads(String gcFlag, boolean emulate_uniprocessor) throws Exception {
  58     // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
  59     String[] defaults = {"-XX:+" + gcFlag, "-Xmx10M", "-XX:+PrintGCDetails",  "-XX:+UseDynamicNumberOfGCThreads", "-XX:+TraceDynamicGCThreads", GCTest.class.getName()};
  60     ArrayList<String> args = new ArrayList();
  61     Collections.addAll(args, defaults);
  62     Arrays.asList(defaults);
  63     // Ensure it works on uniprocessors or if user specifies -XX:ParallelGCThread=1.
  64     if (emulate_uniprocessor) {
  65         args.add(0, "-XX:+ForceDynamicNumberOfGCThreads");
  66         args.add(0, "-XX:ParallelGCThreads=1");
  67     }
  68     String[] finalArgs = new String[args.size()];
  69     finalArgs = args.toArray(finalArgs);
  70     ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs);
  71     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  72   }
  73 
  74   static class GCTest {
  75     private static byte[] garbage;
  76     public static void main(String [] args) {
  77       System.out.println("Creating garbage");
  78       // create 128MB of garbage. This should result in at least one GC
  79       for (int i = 0; i < 1024; i++) {
  80         garbage = new byte[128 * 1024];
  81       }
  82       System.out.println("Done");
  83     }
  84   }
  85 }