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 jdk.test.lib.ProcessTools;
  34 import jdk.test.lib.OutputAnalyzer;
  35 
  36 public class TestDynamicNumberOfGCThreads {
  37   public static void main(String[] args) throws Exception {
  38 
  39     testDynamicNumberOfGCThreads("UseConcMarkSweepGC");
  40 
  41     testDynamicNumberOfGCThreads("UseG1GC");
  42 
  43     testDynamicNumberOfGCThreads("UseParallelGC");
  44   }
  45 
  46   private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) {
  47     output.shouldContain("new_active_workers");
  48     output.shouldHaveExitValue(0);
  49   }
  50 
  51   private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception {
  52     // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled
  53     ProcessBuilder pb_enabled =
  54       ProcessTools.createJavaProcessBuilder("-XX:+" + gcFlag, "-Xmx10M", "-XX:+PrintGCDetails",  "-XX:+UseDynamicNumberOfGCThreads", "-XX:+TraceDynamicGCThreads", GCTest.class.getName());
  55     verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()));
  56   }
  57 
  58   static class GCTest {
  59     private static byte[] garbage;
  60     public static void main(String [] args) {
  61       System.out.println("Creating garbage");
  62       // create 128MB of garbage. This should result in at least one GC
  63       for (int i = 0; i < 1024; i++) {
  64         garbage = new byte[128 * 1024];
  65       }
  66       System.out.println("Done");
  67     }
  68   }
  69 }