1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   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
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  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
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  23 
  24 /**
  25  * @test TestDynMinHeapFreeRatio
  26  * @bug 8028391
  27  * @summary Verify that MinHeapFreeRatio flag is manageable
  28  * @library /testlibrary
  29  * @modules java.base/jdk.internal.misc
  30  * @modules java.management
  31  * @run main TestDynMinHeapFreeRatio
  32  * @run main/othervm -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 TestDynMinHeapFreeRatio
  33  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:-UseAdaptiveSizePolicy TestDynMinHeapFreeRatio
  34  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 TestDynMinHeapFreeRatio
  35  * @run main/othervm -XX:MinHeapFreeRatio=51 -XX:MaxHeapFreeRatio=52 TestDynMinHeapFreeRatio
  36  * @run main/othervm -XX:MinHeapFreeRatio=75 -XX:MaxHeapFreeRatio=100 TestDynMinHeapFreeRatio
  37  */
  38 import static jdk.test.lib.Asserts.assertEQ;
  39 import static jdk.test.lib.Asserts.assertFalse;
  40 import static jdk.test.lib.Asserts.assertTrue;
  41 import jdk.test.lib.DynamicVMOption;
  42 
  43 public class TestDynMinHeapFreeRatio {
  44 
  45     public static void main(String args[]) throws Exception {
  46 
  47         // high boundary value
  48         int maxValue = DynamicVMOption.getInt("MaxHeapFreeRatio");
  49         System.out.println("MaxHeapFreeRatio= " + maxValue);
  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(maxValue + 1),
  59             "-1024", "-1", "101", "1997"
  60         };
  61 
  62         String goodValues[] = {
  63             Integer.toString(maxValue),
  64             Integer.toString(maxValue - 1),
  65             Integer.toString(maxValue / 2),
  66             "0", "1"
  67         };
  68 
  69         // option under test
  70         DynamicVMOption option = new DynamicVMOption("MinHeapFreeRatio");
  71 
  72         assertTrue(option.isWriteable(), "Option " + option.name
  73                 + " is expected to be writable");
  74 
  75         for (String v : badValues) {
  76             assertFalse(option.isValidValue(v),
  77                     "'" + v + "' is expected to be illegal for flag " + option.name);
  78         }
  79 
  80         for (String v : goodValues) {
  81             option.setValue(v);
  82             String newValue = option.getValue();
  83             assertEQ(v, newValue);
  84         }
  85     }
  86 }