| /** |
| * 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.hadoop.mapreduce.util; |
| |
| import java.io.BufferedReader; |
| import java.io.FileNotFoundException; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Plugin to calculate virtual and physical memories on Linux systems. |
| */ |
| public class LinuxMemoryCalculatorPlugin extends MemoryCalculatorPlugin { |
| private static final Log LOG = |
| LogFactory.getLog(LinuxMemoryCalculatorPlugin.class); |
| |
| /** |
| * proc's meminfo virtual file has keys-values in the format |
| * "key:[ \t]*value[ \t]kB". |
| */ |
| private static final String PROCFS_MEMFILE = "/proc/meminfo"; |
| private static final Pattern PROCFS_MEMFILE_FORMAT = |
| Pattern.compile("^([a-zA-Z]*):[ \t]*([0-9]*)[ \t]kB"); |
| |
| // We just need the values for the keys MemTotal and SwapTotal |
| private static final String MEMTOTAL_STRING = "MemTotal"; |
| private static final String SWAPTOTAL_STRING = "SwapTotal"; |
| |
| private long ramSize = 0; |
| private long swapSize = 0; |
| |
| boolean readMemInfoFile = false; |
| |
| private void readProcMemInfoFile() { |
| |
| if (readMemInfoFile) { |
| return; |
| } |
| |
| // Read "/proc/memInfo" file |
| BufferedReader in = null; |
| FileReader fReader = null; |
| try { |
| fReader = new FileReader(PROCFS_MEMFILE); |
| in = new BufferedReader(fReader); |
| } catch (FileNotFoundException f) { |
| // shouldn't happen.... |
| return; |
| } |
| |
| Matcher mat = null; |
| |
| try { |
| String str = in.readLine(); |
| while (str != null) { |
| mat = PROCFS_MEMFILE_FORMAT.matcher(str); |
| if (mat.find()) { |
| if (mat.group(1).equals(MEMTOTAL_STRING)) { |
| ramSize = Long.parseLong(mat.group(2)); |
| } else if (mat.group(1).equals(SWAPTOTAL_STRING)) { |
| swapSize = Long.parseLong(mat.group(2)); |
| } |
| } |
| str = in.readLine(); |
| } |
| } catch (IOException io) { |
| LOG.warn("Error reading the stream " + io); |
| } finally { |
| // Close the streams |
| try { |
| fReader.close(); |
| try { |
| in.close(); |
| } catch (IOException i) { |
| LOG.warn("Error closing the stream " + in); |
| } |
| } catch (IOException i) { |
| LOG.warn("Error closing the stream " + fReader); |
| } |
| } |
| |
| readMemInfoFile = true; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public long getPhysicalMemorySize() { |
| readProcMemInfoFile(); |
| return ramSize * 1024; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public long getVirtualMemorySize() { |
| readProcMemInfoFile(); |
| return (ramSize + swapSize) * 1024; |
| } |
| |
| /** |
| * Test the {@link LinuxMemoryCalculatorPlugin} |
| * |
| * @param args |
| */ |
| public static void main(String[] args) { |
| LinuxMemoryCalculatorPlugin plugin = new LinuxMemoryCalculatorPlugin(); |
| System.out.println("Physical memory Size(bytes) : " |
| + plugin.getPhysicalMemorySize()); |
| System.out.println("Total Virtual memory Size(bytes) : " |
| + plugin.getVirtualMemorySize()); |
| } |
| } |