82 lines
3.2 KiB
Java
82 lines
3.2 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.File;
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import java.io.FileWriter;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.Arrays;
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import java.util.stream.Collectors;
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import java.lang.management.ManagementFactory;
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import javax.management.MalformedObjectNameException;
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import javax.management.ObjectName;
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public class NMTHelper
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{
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public static void baseline() {
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executeDcmd("vmNativeMemory", "baseline");
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}
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// Total: reserved=3484685KB +293KB, committed=266629KB +293KB
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private static Pattern totalLine = Pattern.compile("^Total: reserved=\\d+KB .*KB, committed=\\d+KB (.*)KB$");
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public static long committedDiff() throws Exception {
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String res = (String) executeDcmd("vmNativeMemory", "detail.diff");
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String[] lines = res.split("\n");
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for (String line : lines) {
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Matcher matcher = totalLine.matcher(line);
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if (matcher.matches()) {
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String committed = matcher.group(1);
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return Long.parseLong(committed);
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}
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}
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throw new Exception("Could not find the Total line in the NMT output.");
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}
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private static String executeDcmd(String cmd, String ... args) {
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ObjectName oname = null;
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try {
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oname = ObjectName.getInstance("com.sun.management:type=DiagnosticCommand");
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} catch (MalformedObjectNameException mone) {
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throw new RuntimeException(mone);
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}
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Object[] dcmdArgs = {args};
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String[] signature = {String[].class.getName()};
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String cmdString = cmd + " " +
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Arrays.stream(args).collect(Collectors.joining(" "));
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File f = new File("dcmdoutput-" + cmd + "-" + System.currentTimeMillis() + ".txt");
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System.out.println("Output from Dcmd '" + cmdString + "' is being written to file " + f);
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try (FileWriter fw = new FileWriter(f)) {
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fw.write("> " + cmdString + ":");
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String result = (String)ManagementFactory.getPlatformMBeanServer().
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invoke(oname, cmd, dcmdArgs, signature);
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fw.write(result);
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return result;
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} catch(Exception ex) {
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ex.printStackTrace();
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}
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return null;
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}
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}
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