examples/async/Master.java

   1 /*
   2  * Master of a basic master/slave example in Java
   3  *
   4  * Copyright 2006,2007,2010 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.Process;
  15 import org.simgrid.msg.Msg;
  16 import org.simgrid.msg.MsgException;
  17 import org.simgrid.msg.Task;
  18 import org.simgrid.msg.Process;;
  19
  20 public class Master extends Process {
  21         public void main(String[] args) throws MsgException {
  22                 if (args.length < 4) {
  23                         Msg.info("Master needs 4 arguments");
  24                         System.exit(1);
  25                 }
  26
  27                 int tasksCount = Integer.valueOf(args[0]).intValue();
  28                 double taskComputeSize = Double.valueOf(args[1]).doubleValue();
  29                 double taskCommunicateSize = Double.valueOf(args[2]).doubleValue();
  30
  31                 int slavesCount = Integer.valueOf(args[3]).intValue();
  32
  33                 Msg.info("Hello! Got "+  slavesCount + " slaves and "+tasksCount+" tasks to process");
  34                 ArrayList<Comm> comms = new ArrayList<Comm>();
  35
  36                 for (int i = 0; i < tasksCount; i++) {
  37                         Task task = new Task("Task_" + i, taskComputeSize, taskCommunicateSize);
  38                         Process p = task.getSender();
  39                         Msg.info("Sending \"" + task.getName()+ "\" to \"slave_" + i % slavesCount + "\"");
  40                         //task.send("slave_"+(i%slavesCount));
  41                         Comm comm = task.isend("slave_"+(i%slavesCount));
  42                         comms.add(comm);
  43                 }
  44
  45                 while (comms.size() > 0) {
  46                         for (int i = 0; i < comms.size(); i++) {
  47                                 try {
  48                                         if (comms.get(i).test()) {
  49                                                 comms.remove(i);
  50                                                 i--;
  51                                         }
  52                                 }
  53                                 catch (Exception e) {
  54                                         e.printStackTrace();
  55                                 }
  56                         }
  57                         waitFor(1);
  58                 }
  59
  60                 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.");
  61
  62                 for (int i = 0; i < slavesCount; i++) {
  63                         FinalizeTask task = new FinalizeTask();
  64                         task.dsend("slave_"+(i%slavesCount));
  65                 }
  66                 waitFor(20);
  67
  68                 Msg.info("Goodbye now!");
  69         }
  70 }