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1 /*
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2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.tools;
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26
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27 import sun.jvm.hotspot.debugger.*;
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28 import sun.jvm.hotspot.oops.*;
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29 import sun.jvm.hotspot.runtime.*;
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30 import java.io.PrintStream;
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31
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32 /** A sample tool which uses the Serviceability Agent's APIs to obtain
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33 an object histogram from a remote or crashed VM. */
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34 public class ObjectHistogram extends Tool {
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35
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36 public void run() {
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37 run(System.out, System.err);
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38 }
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39
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40 public void run(PrintStream out, PrintStream err) {
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41 // Ready to go with the database...
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42 ObjectHeap heap = VM.getVM().getObjectHeap();
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43 sun.jvm.hotspot.oops.ObjectHistogram histogram =
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44 new sun.jvm.hotspot.oops.ObjectHistogram();
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45 err.println("Iterating over heap. This may take a while...");
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46 long startTime = System.currentTimeMillis();
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47 heap.iterate(histogram);
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48 long endTime = System.currentTimeMillis();
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49 histogram.printOn(out);
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50 float secs = (float) (endTime - startTime) / 1000.0f;
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51 err.println("Heap traversal took " + secs + " seconds.");
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52 }
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53
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54 public static void main(String[] args) {
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55 ObjectHistogram oh = new ObjectHistogram();
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56 oh.start(args);
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57 oh.stop();
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58 }
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59 }
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