1 /* 2 * Copyright (c) 2003, 2008, 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 26 * @bug 4858522 27 * @summary Basic unit test of HotspotRuntimeMBean.getTotalSafepointTime() 28 * @author Steve Bohne 29 */ 30 31 /* 32 * This test is just a sanity check and does not check for the correct value. 33 */ 34 35 import sun.management.*; 36 37 public class GetTotalSafepointTime { 38 39 private static HotspotRuntimeMBean mbean = 40 (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean(); 41 42 private static final long NUM_THREAD_DUMPS = 100; 43 44 // Careful with these values. 45 private static final long MIN_VALUE_FOR_PASS = 1; 46 private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE; 47 48 private static boolean trace = false; 49 50 public static void main(String args[]) throws Exception { 51 if (args.length > 0 && args[0].equals("trace")) { 52 trace = true; 53 } 54 55 // Thread.getAllStackTraces() should cause safepoints. 56 // If this test is failing because it doesn't, 57 // MIN_VALUE_FOR_PASS should be reset to 0 58 for (int i = 0; i < NUM_THREAD_DUMPS; i++) { 59 Thread.getAllStackTraces(); 60 } 61 62 long value = mbean.getTotalSafepointTime(); 63 64 if (trace) { 65 System.out.println("Total safepoint time (ms): " + value); 66 } 67 68 if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) { 69 throw new RuntimeException("Total safepoint time " + 70 "illegal value: " + value + " ms " + 71 "(MIN = " + MIN_VALUE_FOR_PASS + "; " + 72 "MAX = " + MAX_VALUE_FOR_PASS + ")"); 73 } 74 75 for (int i = 0; i < 2 * NUM_THREAD_DUMPS; i++) { 76 Thread.getAllStackTraces(); 77 } 78 long value2 = mbean.getTotalSafepointTime(); 79 80 if (trace) { 81 System.out.println("Total safepoint time2 (ms): " + value2); 82 } 83 84 if (value2 <= value) { 85 throw new RuntimeException("Total safepoint time " + 86 "did not increase " + 87 "(value = " + value + "; " + 88 "value2 = " + value2 + ")"); 89 } 90 91 System.out.println("Test passed."); 92 } 93 }