1 /*
   2  * Copyright (c) 2017, 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 TestHeapAlloc
  26  * @key gc
  27  * @summary Fail to expand Java heap should not result fatal errors
  28  * @requires (vm.debug == true)
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  * @ignore // heap is not resized in a conventional manner, ignore for now
  33  */
  34 
  35 import jdk.test.lib.process.ProcessTools;
  36 import jdk.test.lib.process.OutputAnalyzer;
  37 import jdk.test.lib.Platform;
  38 
  39 import java.util.*;
  40 import java.util.concurrent.*;
  41 
  42 public class TestHeapAlloc {
  43 
  44   public static void main(String[] args) throws Exception {
  45     if (!Platform.isDebugBuild()) {
  46       System.out.println("Test requires debug build. Please silently for release build");
  47       return;
  48     }
  49 
  50     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  51         true,
  52         "-Xmx1G",
  53         "-Xms256M",
  54         "-XX:+UnlockExperimentalVMOptions",
  55         "-XX:+UseShenandoahGC",
  56         "-XX:ShenandoahFailHeapExpansionAfter=50",
  57         "-Xlog:gc+region=debug",
  58         AllocALotObjects.class.getName());
  59     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  60     output.shouldContain("Artificially fails heap expansion");
  61     output.shouldHaveExitValue(0);
  62   }
  63 
  64   public static class AllocALotObjects {
  65     public static void main(String[] args) {
  66       try {
  67         ArrayList<String> list = new ArrayList<>();
  68         long count = 500 * 1024 * 1024 / 16; // 500MB allocation
  69         for (long index = 0; index < count; index ++) {
  70           String sink = "string " + index;
  71           list.add(sink);
  72         }
  73 
  74         int index = ThreadLocalRandom.current().nextInt(0, (int)count);
  75         System.out.print(list.get(index));
  76       } catch (OutOfMemoryError e) {
  77       }
  78     }
  79   }
  80 
  81 }