1 /*
   2  * Copyright (c) 2014, 2015, 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 import static jdk.test.lib.Asserts.assertEQ;
  25 import static jdk.test.lib.Asserts.assertFalse;
  26 import static jdk.test.lib.Asserts.assertTrue;
  27 import jdk.test.lib.DynamicVMOption;
  28 
  29 /**
  30  * @test TestDynMaxHeapFreeRatio
  31  * @bug 8028391
  32  * @summary Verify that MaxHeapFreeRatio flag is manageable
  33  * @library /testlibrary
  34  * @modules java.base/jdk.internal.misc
  35  * @modules java.management
  36  * @run main TestDynMaxHeapFreeRatio
  37  * @run main/othervm -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 TestDynMaxHeapFreeRatio
  38  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:-UseAdaptiveSizePolicy TestDynMaxHeapFreeRatio
  39  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 TestDynMaxHeapFreeRatio
  40  * @run main/othervm -XX:MinHeapFreeRatio=51 -XX:MaxHeapFreeRatio=52 TestDynMaxHeapFreeRatio
  41  * @run main/othervm -XX:MinHeapFreeRatio=75 -XX:MaxHeapFreeRatio=100 TestDynMaxHeapFreeRatio
  42  */
  43 public class TestDynMaxHeapFreeRatio {
  44 
  45     public static void main(String args[]) throws Exception {
  46 
  47         // low boundary value
  48         int minValue = DynamicVMOption.getInt("MinHeapFreeRatio");
  49         System.out.println("MinHeapFreeRatio= " + minValue);
  50 
  51         String badValues[] = {
  52             null,
  53             "",
  54             "not a number",
  55             "8.5", "-0.01",
  56             Integer.toString(Integer.MIN_VALUE),
  57             Integer.toString(Integer.MAX_VALUE),
  58             Integer.toString(minValue - 1),
  59             "-1024", "-1", "101", "1997"
  60         };
  61 
  62         String goodValues[] = {
  63             Integer.toString(minValue),
  64             Integer.toString(minValue + 1),
  65             Integer.toString((minValue + 100) / 2),
  66             "99", "100"
  67         };
  68 
  69         DynamicVMOption option = new DynamicVMOption("MaxHeapFreeRatio");
  70 
  71         assertTrue(option.isWriteable(), "Option " + option.name
  72                 + " is expected to be writable");
  73 
  74         for (String v : badValues) {
  75             assertFalse(option.isValidValue(v),
  76                     "'" + v + "' is expected to be illegal for flag " + option.name);
  77         }
  78         for (String v : goodValues) {
  79             option.setValue(v);
  80             String newValue = option.getValue();
  81             assertEQ(v, newValue);
  82         }
  83     }
  84 }