| /* |
| * Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4982301 |
| * @summary Sanity Test for GarbageCollectorMXBean.getLastGcInfo(). |
| * @author Mandy Chung |
| * |
| * @run main/othervm -XX:-ExplicitGCInvokesConcurrent LastGCInfo |
| */ |
| // Passing "-XX:-ExplicitGCInvokesConcurrent" to force System.gc() |
| // run on foreground when CMS is used and prevent situations when "GcInfo" |
| // is missing even though System.gc() was successfuly processed. |
| |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryUsage; |
| import java.lang.management.MemoryPoolMXBean; |
| import java.util.*; |
| import com.sun.management.GcInfo; |
| import com.sun.management.GarbageCollectorMXBean; |
| |
| public class LastGCInfo { |
| public static void main(String[] argv) throws Exception { |
| boolean hasGcInfo = false; |
| |
| System.gc(); |
| List mgrs = ManagementFactory.getGarbageCollectorMXBeans(); |
| for (ListIterator iter = mgrs.listIterator(); iter.hasNext(); ) { |
| Object mgr = iter.next(); |
| if (mgr instanceof GarbageCollectorMXBean) { |
| GarbageCollectorMXBean gc = (GarbageCollectorMXBean) mgr; |
| GcInfo info = gc.getLastGcInfo(); |
| if (info != null) { |
| checkGcInfo(gc.getName(), info); |
| hasGcInfo = true; |
| } |
| } |
| } |
| |
| if (! hasGcInfo) { |
| throw new RuntimeException("No GcInfo returned"); |
| } |
| System.out.println("Test passed."); |
| } |
| |
| private static void checkGcInfo(String name, GcInfo info) throws Exception { |
| System.out.println("GC statistic for : " + name); |
| System.out.print("GC #" + info.getId()); |
| System.out.print(" start:" + info.getStartTime()); |
| System.out.print(" end:" + info.getEndTime()); |
| System.out.println(" (" + info.getDuration() + "ms)"); |
| Map usage = info.getMemoryUsageBeforeGc(); |
| |
| List pnames = new ArrayList(); |
| for (Iterator iter = usage.entrySet().iterator(); iter.hasNext(); ) { |
| Map.Entry entry = (Map.Entry) iter.next(); |
| String poolname = (String) entry.getKey(); |
| pnames.add(poolname); |
| MemoryUsage busage = (MemoryUsage) entry.getValue(); |
| MemoryUsage ausage = (MemoryUsage) info.getMemoryUsageAfterGc().get(poolname); |
| if (ausage == null) { |
| throw new RuntimeException("After Gc Memory does not exist" + |
| " for " + poolname); |
| } |
| System.out.println("Usage for pool " + poolname); |
| System.out.println(" Before GC: " + busage); |
| System.out.println(" After GC: " + ausage); |
| } |
| |
| // check if memory usage for all memory pools are returned |
| List pools = ManagementFactory.getMemoryPoolMXBeans(); |
| for (Iterator iter = pools.iterator(); iter.hasNext(); ) { |
| MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next(); |
| if (!pnames.contains(p.getName())) { |
| throw new RuntimeException("GcInfo does not contain " + |
| "memory usage for pool " + p.getName()); |
| } |
| } |
| } |
| } |