1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. 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 CheckAllocateAndSystemGC
  26  * @summary CMS: assert(used() == used_after_gc && used_after_gc <= capacity()) failed: used: 0 used_after_gc: 292080 capacity: 1431699456
  27  * @bug 8013032
  28  * @key gc
  29  * @key regression
  30  * @library /testlibrary
  31  * @run main/othervm CheckAllocateAndSystemGC
  32  * @author jon.masamitsu@oracle.com
  33  */
  34 
  35 import com.oracle.java.testlibrary.*;
  36 
  37 public class CheckAllocateAndSystemGC {
  38   public static void main(String args[]) throws Exception {
  39 
  40     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  41       "-showversion",
  42       "-XX:+UseConcMarkSweepGC",
  43       "-Xmn4m",
  44       "-XX:MaxTenuringThreshold=1",
  45       "-XX:-UseCMSCompactAtFullCollection",
  46       "CheckAllocateAndSystemGC$AllocateAndSystemGC"
  47       );
  48 
  49     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  50 
  51     output.shouldNotContain("error");
  52 
  53     output.shouldHaveExitValue(0);
  54   }
  55   static class AllocateAndSystemGC {
  56     public static void main(String [] args) {
  57       Integer x[] = new Integer [1000];
  58       // Allocate enough objects to cause a minor collection.
  59       // These allocations suffice for a 4m young geneneration.
  60       for (int i = 0; i < 100; i++) {
  61         Integer y[] = new Integer[10000];
  62       }
  63       System.gc();
  64     }
  65   }
  66 }