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.management 35 * @run main TestDynMaxHeapFreeRatio 36 * @run main/othervm -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 TestDynMaxHeapFreeRatio 37 * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:-UseAdaptiveSizePolicy TestDynMaxHeapFreeRatio 38 * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 TestDynMaxHeapFreeRatio 39 * @run main/othervm -XX:MinHeapFreeRatio=51 -XX:MaxHeapFreeRatio=52 TestDynMaxHeapFreeRatio 40 * @run main/othervm -XX:MinHeapFreeRatio=75 -XX:MaxHeapFreeRatio=100 TestDynMaxHeapFreeRatio 41 */ 42 public class TestDynMaxHeapFreeRatio { 43 44 public static void main(String args[]) throws Exception { 45 46 // low boundary value 47 int minValue = DynamicVMOption.getInt("MinHeapFreeRatio"); 48 System.out.println("MinHeapFreeRatio= " + minValue); 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(minValue - 1), 58 "-1024", "-1", "101", "1997" 59 }; 60 61 String goodValues[] = { 62 Integer.toString(minValue), 63 Integer.toString(minValue + 1), 64 Integer.toString((minValue + 100) / 2), 65 "99", "100" 66 }; 67 68 DynamicVMOption option = new DynamicVMOption("MaxHeapFreeRatio"); 69 70 assertTrue(option.isWriteable(), "Option " + option.name 71 + " is expected to be writable"); 72 73 for (String v : badValues) { 74 assertFalse(option.isValidValue(v), 75 "'" + v + "' is expected to be illegal for flag " + option.name); 76 } 77 for (String v : goodValues) { 78 option.setValue(v); 79 String newValue = option.getValue(); 80 assertEQ(v, newValue); 81 } 82 } 83 }