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/*
* Copyright (c) 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.
*/
import java.io.File;
import java.io.FileWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Arrays;
import java.util.stream.Collectors;
import java.lang.management.ManagementFactory;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
public class NMTHelper
{
public static void baseline() {
executeDcmd("vmNativeMemory", "baseline");
}
// Total: reserved=3484685KB +293KB, committed=266629KB +293KB
private static Pattern totalLine = Pattern.compile("^Total: reserved=\\d+KB .*KB, committed=\\d+KB (.*)KB$");
public static long committedDiff() throws Exception {
String res = (String) executeDcmd("vmNativeMemory", "detail.diff");
String[] lines = res.split("\n");
for (String line : lines) {
Matcher matcher = totalLine.matcher(line);
if (matcher.matches()) {
String committed = matcher.group(1);
return Long.parseLong(committed);
}
}
throw new Exception("Could not find the Total line in the NMT output.");
}
private static String executeDcmd(String cmd, String ... args) {
ObjectName oname = null;
try {
oname = ObjectName.getInstance("com.sun.management:type=DiagnosticCommand");
} catch (MalformedObjectNameException mone) {
throw new RuntimeException(mone);
}
Object[] dcmdArgs = {args};
String[] signature = {String[].class.getName()};
String cmdString = cmd + " " +
Arrays.stream(args).collect(Collectors.joining(" "));
File f = new File("dcmdoutput-" + cmd + "-" + System.currentTimeMillis() + ".txt");
System.out.println("Output from Dcmd '" + cmdString + "' is being written to file " + f);
try (FileWriter fw = new FileWriter(f)) {
fw.write("> " + cmdString + ":");
String result = (String)ManagementFactory.getPlatformMBeanServer().
invoke(oname, cmd, dcmdArgs, signature);
fw.write(result);
return result;
} catch(Exception ex) {
ex.printStackTrace();
}
return null;
}
}
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