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comparison agent/src/share/classes/sun/jvm/hotspot/tools/ObjectHistogram.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2002-2005 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 package sun.jvm.hotspot.tools;
26
27 import sun.jvm.hotspot.debugger.*;
28 import sun.jvm.hotspot.oops.*;
29 import sun.jvm.hotspot.runtime.*;
30 import java.io.PrintStream;
31
32 /** A sample tool which uses the Serviceability Agent's APIs to obtain
33 an object histogram from a remote or crashed VM. */
34 public class ObjectHistogram extends Tool {
35
36 public void run() {
37 run(System.out, System.err);
38 }
39
40 public void run(PrintStream out, PrintStream err) {
41 // Ready to go with the database...
42 ObjectHeap heap = VM.getVM().getObjectHeap();
43 sun.jvm.hotspot.oops.ObjectHistogram histogram =
44 new sun.jvm.hotspot.oops.ObjectHistogram();
45 err.println("Iterating over heap. This may take a while...");
46 long startTime = System.currentTimeMillis();
47 heap.iterate(histogram);
48 long endTime = System.currentTimeMillis();
49 histogram.printOn(out);
50 float secs = (float) (endTime - startTime) / 1000.0f;
51 err.println("Heap traversal took " + secs + " seconds.");
52 }
53
54 public static void main(String[] args) {
55 ObjectHistogram oh = new ObjectHistogram();
56 oh.start(args);
57 oh.stop();
58 }
59 }