J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 4858522 |
| 27 | * @summary Basic unit test of HotspotRuntimeMBean.getSafepointSyncTime() |
| 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 GetSafepointSyncTime { |
| 38 | |
| 39 | private static HotspotRuntimeMBean mbean = |
| 40 | (HotspotRuntimeMBean)ManagementFactory.getHotspotRuntimeMBean(); |
| 41 | |
| 42 | private static final long NUM_THREAD_DUMPS = 300; |
| 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.getSafepointSyncTime(); |
| 63 | |
| 64 | if (trace) { |
| 65 | System.out.println("Safepoint sync time (ms): " + value); |
| 66 | } |
| 67 | |
| 68 | if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) { |
| 69 | throw new RuntimeException("Safepoint sync 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 < NUM_THREAD_DUMPS; i++) { |
| 76 | Thread.getAllStackTraces(); |
| 77 | } |
| 78 | |
| 79 | long value2 = mbean.getSafepointSyncTime(); |
| 80 | |
| 81 | if (trace) { |
| 82 | System.out.println("Safepoint sync time2 (ms): " + value2); |
| 83 | } |
| 84 | |
| 85 | if (value2 <= value) { |
| 86 | throw new RuntimeException("Safepoint sync time " + |
| 87 | "did not increase " + |
| 88 | "(value = " + value + "; " + |
| 89 | "value2 = " + value2 + ")"); |
| 90 | } |
| 91 | |
| 92 | System.out.println("Test passed."); |
| 93 | } |
| 94 | } |