examples/java/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.Msg;
  16 import org.simgrid.msg.MsgException;
  17 import org.simgrid.msg.Process;
  18 import org.simgrid.msg.Task;
  19
  20 public class Master extends Process {
  21         public Master(Host host, String name, String[]args) {
  22                 super(host,name,args);
  23         }
  24         public void main(String[] args) throws MsgException {
  25                 if (args.length < 4) {
  26                         Msg.info("Master needs 4 arguments");
  27                         System.exit(1);
  28                 }
  29
  30                 int tasksCount = Integer.valueOf(args[0]).intValue();
  31                 double taskComputeSize = Double.valueOf(args[1]).doubleValue();
  32                 double taskCommunicateSize = Double.valueOf(args[2]).doubleValue();
  33
  34                 int slavesCount = Integer.valueOf(args[3]).intValue();
  35
  36                 Msg.info("Hello! Got "+  slavesCount + " slaves and "+tasksCount+" tasks to process");
  37                 ArrayList<Comm> comms = new ArrayList<Comm>();
  38
  39                 for (int i = 0; i < tasksCount; i++) {
  40                         Task task = new Task("Task_" + i, taskComputeSize, taskCommunicateSize);
  41                         Msg.info("Sending \"" + task.getName()+ "\" to \"slave_" + i % slavesCount + "\"");
  42                         //task.send("slave_"+(i%slavesCount));
  43                         Comm comm = task.isend("slave_"+(i%slavesCount));
  44                         comms.add(comm);
  45                 }
  46
  47                 while (comms.size() > 0) {
  48                         for (int i = 0; i < comms.size(); i++) {
  49                                 try {
  50                                         if (comms.get(i).test()) {
  51                                                 comms.remove(i);
  52                                                 i--;
  53                                         }
  54                                 }
  55                                 catch (Exception e) {
  56                                         e.printStackTrace();
  57                                 }
  58                         }
  59                         waitFor(1);
  60                 }
  61
  62                 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.");
  63
  64                 for (int i = 0; i < slavesCount; i++) {
  65                         FinalizeTask task = new FinalizeTask();
  66                         task.dsend("slave_"+(i%slavesCount));
  67                 }
  68                 waitFor(20);
  69
  70                 Msg.info("Goodbye now!");
  71         }
  72 }