1 /*
   2  * Copyright (c) 2014, 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 TestDynMinHeapFreeRatio
  26  * @bug 8028391
  27  * @summary Verify that MinHeapFreeRatio flag is manageable
  28  * @library /testlibrary
  29  * @build com.oracle.java.testlibrary.*
  30  * @run main TestDynMinHeapFreeRatio
  31  * @run main/othervm -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 TestDynMinHeapFreeRatio
  32  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:-UseAdaptiveSizePolicy TestDynMinHeapFreeRatio
  33  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 TestDynMinHeapFreeRatio
  34  * @run main/othervm -XX:MinHeapFreeRatio=51 -XX:MaxHeapFreeRatio=52 TestDynMinHeapFreeRatio
  35  * @run main/othervm -XX:MinHeapFreeRatio=75 -XX:MaxHeapFreeRatio=100 TestDynMinHeapFreeRatio
  36  */
  37 import static com.oracle.java.testlibrary.Asserts.assertEQ;
  38 import static com.oracle.java.testlibrary.Asserts.assertFalse;
  39 import static com.oracle.java.testlibrary.Asserts.assertTrue;
  40 import com.oracle.java.testlibrary.DynamicVMOption;
  41 
  42 public class TestDynMinHeapFreeRatio {
  43 
  44     public static void main(String args[]) throws Exception {
  45 
  46         // high boundary value
  47         int maxValue = DynamicVMOption.getInt("MaxHeapFreeRatio");
  48         System.out.println("MaxHeapFreeRatio= " + maxValue);
  49 
  50         String badValues[] = {
  51             null,
  52             "",
  53             "not a number",
  54             "8.5", "-0.01",
  55             Integer.toString(Integer.MIN_VALUE),
  56             Integer.toString(Integer.MAX_VALUE),
  57             Integer.toString(maxValue + 1),
  58             "-1024", "-1", "101", "1997"
  59         };
  60 
  61         String goodValues[] = {
  62             Integer.toString(maxValue),
  63             Integer.toString(maxValue - 1),
  64             Integer.toString(maxValue / 2),
  65             "0", "1"
  66         };
  67 
  68         // option under test
  69         DynamicVMOption option = new DynamicVMOption("MinHeapFreeRatio");
  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 
  79         for (String v : goodValues) {
  80             option.setValue(v);
  81             String newValue = option.getValue();
  82             assertEQ(v, newValue);
  83         }
  84     }
  85 }