1 /*
   2  * Copyright (c) 2017, 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 package gc.epsilon;
  25 
  26 /**
  27  * @test TestSlidingGC
  28  * @key gc
  29  * @requires vm.gc.Epsilon & !vm.graal.enabled
  30  * @summary Epsilon sliding GC works
  31  * @library /test/lib
  32  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC                                         gc.epsilon.TestSlidingGC
  33  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC -XX:+EpsilonVerify                      gc.epsilon.TestSlidingGC
  34  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC -XX:+EpsilonVerify -XX:+EpsilonUncommit gc.epsilon.TestSlidingGC
  35  */
  36 
  37 import java.util.concurrent.*;
  38 
  39 import jdk.test.lib.process.OutputAnalyzer;
  40 import jdk.test.lib.process.ProcessTools;
  41 
  42 public class TestSlidingGC {
  43 
  44   static int SIZE  = Integer.getInteger("size", 10_000_000);
  45   static int COUNT = Integer.getInteger("count", 100_000_000); // ~2.4 GB allocation
  46 
  47   static Object[] sink;
  48 
  49   public static void main(String... args) {
  50     sink = new Object[SIZE];
  51     for (int c = 0; c < COUNT; c++) {
  52       sink[ThreadLocalRandom.current().nextInt(SIZE)] = new Object();
  53     }
  54   }
  55 
  56 }