Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/tools/ObjectHistogram.java @ 19491:4d66c000d253
Truffle/Instrumentation: more cleanup in Probe
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 18 Feb 2015 18:30:49 -0800 |
parents | 89152779163c |
children |
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/* * 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); } }