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 sun.management.ManagementFactoryHelper; 31 import com.sun.management.DiagnosticCommandMBean; 32 33 public class NMTHelper 34 { 35 public static void baseline() { 36 executeDcmd("vmNativeMemory", "baseline"); 37 } 38 39 // Total: reserved=3484685KB +293KB, committed=266629KB +293KB 40 private static Pattern totalLine = Pattern.compile("^Total: reserved=\\d+KB .*KB, committed=\\d+KB (.*)KB$"); 41 42 public static long committedDiff() throws Exception { 43 String res = (String) executeDcmd("vmNativeMemory", "detail.diff"); 44 String[] lines = res.split("\n"); 45 for (String line : lines) { 46 Matcher matcher = totalLine.matcher(line); 47 if (matcher.matches()) { 48 String committed = matcher.group(1); 49 return Long.parseLong(committed); 50 } 51 } 52 throw new Exception("Could not find the Total line in the NMT output."); 53 } 54 55 private static String executeDcmd(String cmd, String ... args) { 56 DiagnosticCommandMBean dcmd = ManagementFactoryHelper.getDiagnosticCommandMBean(); 57 Object[] dcmdArgs = {args}; 58 String[] signature = {String[].class.getName()}; 59 60 String cmdString = cmd + " " + 61 Arrays.stream(args).collect(Collectors.joining(" ")); 62 File f = new File("dcmdoutput-" + cmd + "-" + System.currentTimeMillis() + ".txt"); 63 System.out.println("Output from Dcmd '" + cmdString + "' is being written to file " + f); 64 try (FileWriter fw = new FileWriter(f)) { 65 fw.write("> " + cmdString + ":"); 66 String result = (String) dcmd.invoke(cmd, dcmdArgs, signature); 67 fw.write(result); 68 return result; 69 } catch(Exception ex) { 70 ex.printStackTrace(); 71 } 72 return null; 73 } 74 }