1 /* 2 * Copyright (c) 2013 Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.File; 25 import java.io.FileWriter; 26 import java.util.regex.Matcher; 27 import java.util.regex.Pattern; 28 import java.util.Arrays; 29 import java.util.stream.Collectors; 30 import java.lang.management.ManagementFactory; 31 import javax.management.MalformedObjectNameException; 32 import javax.management.ObjectName; 33 34 public class NMTHelper 35 { 36 public static void baseline() { 37 executeDcmd("vmNativeMemory", "baseline"); 38 } 39 40 // Total: reserved=3484685KB +293KB, committed=266629KB +293KB 41 private static Pattern totalLine = Pattern.compile("^Total: reserved=\\d+KB .*KB, committed=\\d+KB (.*)KB$"); 42 43 public static long committedDiff() throws Exception { 44 String res = (String) executeDcmd("vmNativeMemory", "detail.diff"); 45 String[] lines = res.split("\n"); 46 for (String line : lines) { 47 Matcher matcher = totalLine.matcher(line); 48 if (matcher.matches()) { 49 String committed = matcher.group(1); 50 return Long.parseLong(committed); 51 } 52 } 53 throw new Exception("Could not find the Total line in the NMT output."); 54 } 55 56 private static String executeDcmd(String cmd, String ... args) { 57 ObjectName oname = null; 58 try { 59 oname = ObjectName.getInstance("com.sun.management:type=DiagnosticCommand"); 60 } catch (MalformedObjectNameException mone) { 61 throw new RuntimeException(mone); 62 } 63 Object[] dcmdArgs = {args}; 64 String[] signature = {String[].class.getName()}; 65 66 String cmdString = cmd + " " + 67 Arrays.stream(args).collect(Collectors.joining(" ")); 68 File f = new File("dcmdoutput-" + cmd + "-" + System.currentTimeMillis() + ".txt"); 69 System.out.println("Output from Dcmd '" + cmdString + "' is being written to file " + f); 70 try (FileWriter fw = new FileWriter(f)) { 71 fw.write("> " + cmdString + ":"); 72 String result = (String)ManagementFactory.getPlatformMBeanServer(). 73 invoke(oname, cmd, dcmdArgs, signature); 74 fw.write(result); 75 return result; 76 } catch(Exception ex) { 77 ex.printStackTrace(); 78 } 79 return null; 80 } 81 }