1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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.
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22  */
23 
24 package gc.arguments;
25 
26 import static jdk.test.lib.Asserts.assertEQ;
27 import static jdk.test.lib.Asserts.assertFalse;
28 import static jdk.test.lib.Asserts.assertTrue;
29 import jdk.test.lib.management.DynamicVMOption;
30 
31 /**
32  * @test TestDynMaxHeapFreeRatio
33  * @bug 8028391
34  * @summary Verify that MaxHeapFreeRatio flag is manageable
35  * @library /test/lib
36  * @modules java.base/jdk.internal.misc
37  * @modules java.management
38  * @run main gc.arguments.TestDynMaxHeapFreeRatio
39  * @run main/othervm -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 gc.arguments.TestDynMaxHeapFreeRatio
40  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:-UseAdaptiveSizePolicy gc.arguments.TestDynMaxHeapFreeRatio
41  * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 gc.arguments.TestDynMaxHeapFreeRatio
42  * @run main/othervm -XX:MinHeapFreeRatio=51 -XX:MaxHeapFreeRatio=52 gc.arguments.TestDynMaxHeapFreeRatio
43  * @run main/othervm -XX:MinHeapFreeRatio=75 -XX:MaxHeapFreeRatio=100 gc.arguments.TestDynMaxHeapFreeRatio
44  */
45 public class TestDynMaxHeapFreeRatio {
46 
main(String args[])47     public static void main(String args[]) throws Exception {
48 
49         // low boundary value
50         int minValue = DynamicVMOption.getInt("MinHeapFreeRatio");
51         System.out.println("MinHeapFreeRatio= " + minValue);
52 
53         String badValues[] = {
54             null,
55             "",
56             "not a number",
57             "8.5", "-0.01",
58             Integer.toString(Integer.MIN_VALUE),
59             Integer.toString(Integer.MAX_VALUE),
60             Integer.toString(minValue - 1),
61             "-1024", "-1", "101", "1997"
62         };
63 
64         String goodValues[] = {
65             Integer.toString(minValue),
66             Integer.toString(minValue + 1),
67             Integer.toString((minValue + 100) / 2),
68             "99", "100"
69         };
70 
71         DynamicVMOption option = new DynamicVMOption("MaxHeapFreeRatio");
72 
73         assertTrue(option.isWriteable(), "Option " + option.name
74                 + " is expected to be writable");
75 
76         for (String v : badValues) {
77             assertFalse(option.isValidValue(v),
78                     "'" + v + "' is expected to be illegal for flag " + option.name);
79         }
80         for (String v : goodValues) {
81             option.setValue(v);
82             String newValue = option.getValue();
83             assertEQ(v, newValue);
84         }
85     }
86 }
87