1 /*
   2  * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /*
  25  * @test TestThreadCounts
  26  * @summary Test that Shenandoah GC thread counts are handled well
  27  * @key gc
  28  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  * @run driver TestThreadCounts
  33  */
  34 
  35 import jdk.test.lib.process.ProcessTools;
  36 import jdk.test.lib.process.OutputAnalyzer;
  37 
  38 public class TestThreadCounts {
  39     public static void main(String[] args) throws Exception {
  40         for (int conc = 0; conc < 16; conc++) {
  41             for (int par = 0; par < 16; par++) {
  42                 testWith(conc, par);
  43             }
  44         }
  45     }
  46 
  47     private static void testWith(int conc, int par) throws Exception {
  48         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
  49                 "-XX:+UnlockExperimentalVMOptions",
  50                 "-XX:+UseShenandoahGC",
  51                 "-XX:ConcGCThreads=" + conc,
  52                 "-XX:ParallelGCThreads=" + par,
  53                 "-version");
  54         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  55 
  56         if (conc == 0) {
  57             output.shouldContain("Shenandoah expects ConcGCThreads > 0");
  58             output.shouldHaveExitValue(1);
  59         } else if (par == 0) {
  60             output.shouldContain("Shenandoah expects ParallelGCThreads > 0");
  61             output.shouldHaveExitValue(1);
  62         } else if (conc > par) {
  63             output.shouldContain("Shenandoah expects ConcGCThreads <= ParallelGCThreads");
  64             output.shouldHaveExitValue(0);
  65         } else {
  66             output.shouldNotContain("Shenandoah expects ConcGCThreads <= ParallelGCThreads");
  67             output.shouldHaveExitValue(0);
  68         }
  69     }
  70 
  71 }