org/objectweb/proactive/loadbalancing/metrics/CPURanking/LinuxCPURanking.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.loadbalancing.metrics.CPURanking;

import java.io.*;

import org.objectweb.proactive.loadbalancing.LoadBalancer;
import org.objectweb.proactive.loadbalancing.LoadBalancingConstants;
import org.objectweb.proactive.loadbalancing.metrics.Metric;


public class LinuxCPURanking implements Metric {
    private double ranking = 1;
        private double normaLoad;
        private RandomAccessFile statfile;

    public LinuxCPURanking() {
        BufferedReader br;
        String line = null;
        try {
            br = new BufferedReader(new FileReader("/proc/cpuinfo"));

            while ((line = br.readLine()) != null) {
                if (line.startsWith("cpu MHz")) {
                    String[] splited = line.split(":");
                    double cpuClock = Double.parseDouble(splited[1]); // obtaining the cpu clock
                    ranking = cpuClock / 1000;
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (NumberFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        this.normaLoad = 1.0;
        //load = 0;
        int nProcessors = 0;
        try {
                nProcessors = Runtime.getRuntime().availableProcessors();
                if (nProcessors > 1) this.normaLoad = 1/(1.0 * nProcessors);
            statfile = new RandomAccessFile("/proc/loadavg", "r");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (NumberFormatException e) {
            e.printStackTrace();
                }
    }
    
    public void setRanking(double x) {
        ranking = x;
    }

    public void addToRanking(double x) {
        ranking += x;
    }
    

    /* -- IMPLEMENTS METRIC -- */
    
    public double getRanking() {
        return ranking;
    }

    
        public void takeDecision(LoadBalancer lb) {
                double load = getLoad();
                if (load > LoadBalancingConstants.OVERLOADED_THREASHOLD) {
          lb.startBalancing();
        } else if (load < LoadBalancingConstants.UNDERLOADED_THREASHOLD) {
           lb.stealWork();
        }
                
        }

        public double getLoad() {
                 String cpuLine = null;
                try {
                    statfile.seek(0);
                    cpuLine = statfile.readLine();
                } catch (IOException e) {
                    return 1;
                }

                double min1;
                
                java.util.StringTokenizer st = new java.util.StringTokenizer(cpuLine," ");
                min1 = Double.parseDouble(st.nextToken());

               return min1*normaLoad;
        }
}

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