| /* |
| * Copyright (c) 2002, 2013, 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. |
| * |
| */ |
| |
| package sun.jvm.hotspot.tools; |
| |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.runtime.*; |
| import java.io.PrintStream; |
| |
| /** A sample tool which uses the Serviceability Agent's APIs to obtain |
| an object histogram from a remote or crashed VM. */ |
| public class ObjectHistogram extends Tool { |
| |
| public ObjectHistogram() { |
| super(); |
| } |
| |
| public ObjectHistogram(JVMDebugger d) { |
| super(d); |
| } |
| |
| public void run() { |
| run(System.out, System.err); |
| } |
| |
| public void run(PrintStream out, PrintStream err) { |
| // Ready to go with the database... |
| ObjectHeap heap = VM.getVM().getObjectHeap(); |
| sun.jvm.hotspot.oops.ObjectHistogram histogram = |
| new sun.jvm.hotspot.oops.ObjectHistogram(); |
| err.println("Iterating over heap. This may take a while..."); |
| long startTime = System.currentTimeMillis(); |
| heap.iterate(histogram); |
| long endTime = System.currentTimeMillis(); |
| histogram.printOn(out); |
| float secs = (float) (endTime - startTime) / 1000.0f; |
| err.println("Heap traversal took " + secs + " seconds."); |
| } |
| |
| public static void main(String[] args) { |
| ObjectHistogram oh = new ObjectHistogram(); |
| oh.execute(args); |
| } |
| } |