| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.giraph.utils; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.PrintStream; |
| import java.lang.management.ManagementFactory; |
| import java.nio.charset.Charset; |
| import java.util.Date; |
| |
| /** |
| * Helper to run jmap and print the output |
| */ |
| public class JMap { |
| /** Arguments to pass in to command */ |
| public static final String ARGS = " -histo "; |
| /** This option will print out onlu live objects */ |
| private static String LIVE_HISTO_OPTION = " -histo:live "; |
| |
| /** Do not construct */ |
| protected JMap() { } |
| |
| /** |
| * Get the process ID of the current running process |
| * |
| * @return Integer process ID |
| */ |
| public static int getProcessId() { |
| String processId = ManagementFactory.getRuntimeMXBean().getName(); |
| if (processId.contains("@")) { |
| processId = processId.substring(0, processId.indexOf("@")); |
| } |
| return Integer.parseInt(processId); |
| } |
| |
| /** |
| * Run jmap, print numLines of output from it to stderr. |
| * |
| * @param numLines Number of lines to print |
| * @param liveObjectsOnly Should we only print non GC-able objects? |
| * @param jmapPath Path to jmap binary |
| */ |
| public static void heapHistogramDump(int numLines, |
| boolean liveObjectsOnly, |
| String jmapPath) { |
| heapHistogramDump(numLines, liveObjectsOnly, System.err, jmapPath); |
| } |
| |
| /** |
| * Run jmap, print numLines of output from it to stderr. |
| * |
| * @param numLines Number of lines to print |
| * @param jmapPath Path to jmap binary |
| */ |
| public static void heapHistogramDump(int numLines, String jmapPath) { |
| heapHistogramDump(numLines, System.err, jmapPath); |
| } |
| |
| /** |
| * Run jmap, print numLines of output from it to stream passed in. |
| * |
| * @param numLines Number of lines to print |
| * @param printStream Stream to print to |
| * @param jmapPath Path to jmap binary |
| */ |
| public static void heapHistogramDump(int numLines, PrintStream printStream, |
| String jmapPath) { |
| heapHistogramDump(numLines, false, printStream, jmapPath); |
| } |
| |
| /** |
| * Run jmap, print numLines of output from it to stream passed in. |
| * |
| * @param numLines Number of lines to print |
| * @param liveObjectsOnly Should we only print non GC-able objects? |
| * @param printStream Stream to print to |
| * @param jmapPath Path to jmap binary |
| */ |
| private static void heapHistogramDump(int numLines, |
| boolean liveObjectsOnly, |
| PrintStream printStream, |
| String jmapPath) { |
| try { |
| String args = liveObjectsOnly ? LIVE_HISTO_OPTION : ARGS; |
| Process p = Runtime.getRuntime().exec(jmapPath + args + getProcessId()); |
| BufferedReader in = new BufferedReader( |
| new InputStreamReader(p.getInputStream(), Charset.defaultCharset())); |
| printStream.println("JMap " + |
| (liveObjectsOnly ? "histo:live" : "histo") + |
| " dump at " + new Date()); |
| String line = in.readLine(); |
| for (int i = 0; i < numLines && line != null; ++i) { |
| printStream.println("--\t" + line); |
| line = in.readLine(); |
| } |
| in.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |