1 /*
   2  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   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 HeapUncommit
  26  * @summary Acceptance tests: collector can withstand allocation
  27  *
  28  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=passive      -XX:ShenandoahUncommitDelay=0 -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify HeapUncommit
  29  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=passive      -XX:ShenandoahUncommitDelay=0 -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify HeapUncommit
  30  *
  31  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=adaptive     -XX:ShenandoahUncommitDelay=0 -XX:+ShenandoahVerify HeapUncommit
  32  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=static       -XX:ShenandoahUncommitDelay=0 -XX:+ShenandoahVerify HeapUncommit
  33  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=compact      -XX:ShenandoahUncommitDelay=0 -XX:+ShenandoahVerify HeapUncommit
  34  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=aggressive   -XX:ShenandoahUncommitDelay=0 -XX:+ShenandoahVerify HeapUncommit
  35  *
  36  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=passive      -XX:ShenandoahUncommitDelay=0                       HeapUncommit
  37  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=adaptive     -XX:ShenandoahUncommitDelay=0                       HeapUncommit
  38  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=static       -XX:ShenandoahUncommitDelay=0                       HeapUncommit
  39  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=compact      -XX:ShenandoahUncommitDelay=0                       HeapUncommit
  40  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -XX:+ShenandoahUncommit -XX:ShenandoahGCHeuristics=aggressive   -XX:ShenandoahUncommitDelay=0                       HeapUncommit
  41  */
  42 
  43 import java.util.Random;
  44 
  45 public class HeapUncommit {
  46 
  47   static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation
  48 
  49   static volatile Object sink;
  50 
  51   public static void main(String[] args) throws Exception {
  52     final int min = 0;
  53     final int max = 384*1024;
  54     long count = TARGET_MB * 1024 * 1024 / (16 + 4*(min + (max-min)/2));
  55 
  56     Random r = new Random();
  57     for (long c = 0; c < count; c++) {
  58       sink = new int[min + r.nextInt(max-min)];
  59     }
  60   }
  61 
  62 }