simgrid-java/examples/async/Master.java

   1 /*
   2  * Master of a basic master/slave example in Java
   3  *
   4  * Copyright 2006-2012 The SimGrid Team. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the license (GNU LGPL) which comes with this package.
   8  */
   9
  10 package async;
  11 import java.util.ArrayList;
  12
  13 import org.simgrid.msg.Comm;
  14 import org.simgrid.msg.Host;
  15 import org.simgrid.msg.Process;
  16 import org.simgrid.msg.Msg;
  17 import org.simgrid.msg.MsgException;
  18 import org.simgrid.msg.Task;
  19 import org.simgrid.msg.Process;;
  20
  21 public class Master extends Process {
  22         public Master(Host host, String name, String[]args) {
  23                 super(host,name,args);
  24         }
  25         public void main(String[] args) throws MsgException {
  26                 if (args.length < 4) {
  27                         Msg.info("Master needs 4 arguments");
  28                         System.exit(1);
  29                 }
  30
  31                 int tasksCount = Integer.valueOf(args[0]).intValue();
  32                 double taskComputeSize = Double.valueOf(args[1]).doubleValue();
  33                 double taskCommunicateSize = Double.valueOf(args[2]).doubleValue();
  34
  35                 int slavesCount = Integer.valueOf(args[3]).intValue();
  36
  37                 Msg.info("Hello! Got "+  slavesCount + " slaves and "+tasksCount+" tasks to process");
  38                 ArrayList<Comm> comms = new ArrayList<Comm>();
  39
  40                 for (int i = 0; i < tasksCount; i++) {
  41                         Task task = new Task("Task_" + i, taskComputeSize, taskCommunicateSize);
  42                         Msg.info("Sending \"" + task.getName()+ "\" to \"slave_" + i % slavesCount + "\"");
  43                         //task.send("slave_"+(i%slavesCount));
  44                         Comm comm = task.isend("slave_"+(i%slavesCount));
  45                         comms.add(comm);
  46                 }
  47
  48                 while (comms.size() > 0) {
  49                         for (int i = 0; i < comms.size(); i++) {
  50                                 try {
  51                                         if (comms.get(i).test()) {
  52                                                 comms.remove(i);
  53                                                 i--;
  54                                         }
  55                                 }
  56                                 catch (Exception e) {
  57                                         e.printStackTrace();
  58                                 }
  59                         }
  60                         waitFor(1);
  61                 }
  62
  63                 Msg.info("All tasks have been dispatched. Let's tell (asynchronously) everybody the computation is over, and sleep 20s so that nobody gets a message from a terminated process.");
  64
  65                 for (int i = 0; i < slavesCount; i++) {
  66                         FinalizeTask task = new FinalizeTask();
  67                         task.dsend("slave_"+(i%slavesCount));
  68                 }
  69                 waitFor(20);
  70
  71                 Msg.info("Goodbye now!");
  72         }
  73 }