1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. 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 TestCommonGCLoads
  26  * @summary Test GC state load commoning works
  27  * @key gc
  28  * @requires vm.flavor == "server"
  29  *
  30  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation
  31  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
  32  *                   -XX:-ShenandoahCommonGCStateLoads
  33  *                   TestCommonGCLoads
  34  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation
  35  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
  36  *                   -XX:+ShenandoahCommonGCStateLoads
  37  *                   TestCommonGCLoads
  38  */
  39 
  40 public class TestCommonGCLoads {
  41 
  42     static Object d = new Object();
  43 
  44     static Target t1 = new Target();
  45     static Target t2 = new Target();
  46     static Target t3 = new Target();
  47     static Target t4 = new Target();
  48     static Target t5 = new Target();
  49 
  50     static void test() {
  51         t1.field = d;
  52         t2.field = d;
  53         t3.field = d;
  54         t4.field = d;
  55         t5.field = d;
  56     }
  57 
  58     static public void main(String[] args) {
  59         for (int i = 0; i < 100_000; i++) {
  60             test();
  61         }
  62     }
  63 
  64     static class Target {
  65         Object field;
  66     }
  67 }