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  * @library /testlibrary
  29  * @run driver TestThreadCounts
  30  */
  31 
  32 import com.oracle.java.testlibrary.*;
  33 
  34 public class TestThreadCounts {
  35     public static void main(String[] args) throws Exception {
  36         for (int conc = 0; conc < 16; conc++) {
  37             for (int par = 0; par < 16; par++) {
  38                 testWith(conc, par);
  39             }
  40         }
  41     }
  42 
  43     private static void testWith(int conc, int par) throws Exception {
  44         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  45                 "-Xmx128m",
  46                 "-XX:+UnlockDiagnosticVMOptions",
  47                 "-XX:+UnlockExperimentalVMOptions",
  48                 "-XX:+UseShenandoahGC",
  49                 "-XX:ConcGCThreads=" + conc,
  50                 "-XX:ParallelGCThreads=" + par,
  51                 "-version");
  52         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  53 
  54         if (conc == 0) {
  55             output.shouldContain("Shenandoah expects ConcGCThreads > 0");
  56             output.shouldHaveExitValue(1);
  57         } else if (par == 0) {
  58             output.shouldContain("Shenandoah expects ParallelGCThreads > 0");
  59             output.shouldHaveExitValue(1);
  60         } else if (conc > par) {
  61             output.shouldContain("Shenandoah expects ConcGCThreads <= ParallelGCThreads");
  62             output.shouldHaveExitValue(1);
  63         } else {
  64             output.shouldNotContain("Shenandoah expects ConcGCThreads <= ParallelGCThreads");
  65             output.shouldHaveExitValue(0);
  66         }
  67     }
  68 
  69 }