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 TestElasticTLABDecay
  28  * @key randomness
  29  * @requires vm.gc.Epsilon
  30  * @summary Epsilon is able to work with/without elastic TLABs
  31  * @library /test/lib
  32  *
  33  * @run main/othervm -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonElasticTLAB -XX:-EpsilonElasticTLABDecay                               gc.epsilon.TestElasticTLABDecay
  34  * @run main/othervm -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonElasticTLAB -XX:+EpsilonElasticTLABDecay -XX:EpsilonTLABDecayTime=1    gc.epsilon.TestElasticTLABDecay
  35  * @run main/othervm -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonElasticTLAB -XX:+EpsilonElasticTLABDecay -XX:EpsilonTLABDecayTime=100  gc.epsilon.TestElasticTLABDecay
  36  */
  37 
  38 import java.util.Random;
  39 import jdk.test.lib.Utils;
  40 
  41 public class TestElasticTLABDecay {
  42   static int COUNT = Integer.getInteger("count", 3000); // ~500 MB allocation
  43 
  44   static byte[][] arr;
  45 
  46   public static void main(String[] args) throws Exception {
  47     Random r = Utils.getRandomInstance();
  48 
  49     arr = new byte[COUNT * 100][];
  50     for (int c = 0; c < COUNT; c++) {
  51       arr[c] = new byte[c * 100];
  52       for (int v = 0; v < c; v++) {
  53         arr[c][v] = (byte)(r.nextInt(255) & 0xFF);
  54       }
  55       Thread.sleep(5);
  56     }
  57 
  58     r = new Random(Utils.SEED);
  59     for (int c = 0; c < COUNT; c++) {
  60       byte[] b = arr[c];
  61       if (b.length != (c * 100)) {
  62         throw new IllegalStateException("Failure: length = " + b.length + ", need = " + (c*100));
  63       }
  64       for (int v = 0; v < c; v++) {
  65         byte actual = b[v];
  66         byte expected = (byte)(r.nextInt(255) & 0xFF);
  67         if (actual != expected) {
  68           throw new IllegalStateException("Failure: expected = " + expected + ", actual = " + actual);
  69         }
  70       }
  71     }
  72   }
  73 }