1 | // Master-worker program to read in a list of files and invoke
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2 | // dspace filter-media on each separately using OpenMPI
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3 | //
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4 | // John Thompson
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5 | // 8 June 2012
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6 |
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7 | #include "mpi.h"
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8 |
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9 | #include <stdio.h>
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10 | #include <stdlib.h>
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11 |
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12 | #include <fstream>
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13 | #include <iostream>
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14 | #include <sstream>
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15 | #include <string>
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16 | #include <vector>
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17 |
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18 | using namespace std;
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19 |
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20 | #define BUFFERSIZE 512
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21 |
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22 | int
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23 | main ( int argc, char *argv [] )
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24 | {
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25 | int numtasks, rank, rc; // MPI variables
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26 |
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27 | if (3 != argc )
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28 | {
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29 | cerr << "Usage: " << argv[0] << " dspacehome filelist" << endl;
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30 | exit(-1);
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31 | }
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32 |
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33 | char *dspacehomedir = argv[1]; // location of import script
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34 | char *filelist = argv[2];
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35 |
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36 | // start MPI environment
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37 | rc = MPI_Init(&argc,&argv);
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38 | if (rc != MPI_SUCCESS)
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39 | {
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40 | printf ("Error starting MPI program. Terminating.\n");
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41 | MPI_Abort(MPI_COMM_WORLD, rc);
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42 | }
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43 |
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44 | // We'll handle errors ourselves
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45 | MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
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46 |
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47 | // get MPI variables: number of processors and processor number
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48 | MPI_Status stat;
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49 | MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
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50 | MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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51 |
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52 | // master node processing
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53 | if (rank == 0)
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54 | {
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55 | cerr << " * Master Starting" << endl;
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56 | char incoming[BUFFERSIZE]; // buffer for acknowledgments
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57 | char buffer[BUFFERSIZE]; // buffer to send tasks
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58 | MPI_Request request[BUFFERSIZE]; // request monitor for all tasks
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59 | MPI_Status status[BUFFERSIZE]; // status monitor for all tasks
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60 | int actualTasks = 0; // number of processors running
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61 |
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62 | // open file listing filenames to process
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63 | ifstream infile;
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64 | infile.open (filelist);
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65 | string line_str;
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66 |
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67 | // set initial status of all processors to idle
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68 | cerr << " - initializing processor state" << endl;
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69 | for ( int j=0; j<BUFFERSIZE; j++ )
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70 | {
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71 | incoming[j] = ' ';
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72 | }
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73 |
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74 | // scan through contents of file listing
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75 | cerr << " - processing contents of filelist.txt" << endl;
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76 | while (!infile.eof ())
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77 | {
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78 | // get a filename
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79 | getline (infile, line_str);
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80 | if (line_str.length() > 0)
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81 | {
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82 | // search for idle processor
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83 | int dest=0;
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84 | int found = 0;
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85 | cerr << " - searching for idle processor" << endl;
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86 | while ((dest<(numtasks-1)) && (found == 0))
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87 | {
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88 | if (incoming[dest] == ' ')
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89 | {
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90 | found = 1;
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91 | }
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92 | else
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93 | {
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94 | dest++;
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95 | }
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96 | }
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97 |
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98 | // if no idle processor, wait for one to become idle
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99 | if (found == 0)
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100 | {
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101 | cerr << " - waiting for processor to become idle" << endl;
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102 | MPI_Waitany (numtasks-1, request, &dest, status);
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103 | }
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104 |
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105 | // No need for manifests - just send the identifier of the item
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106 | // to filter to the worker
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107 | cerr << " - writing dspace identifier as instruction to worker" << endl;
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108 | char *line = new char [line_str.size() + 1];
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109 | strcpy(line, line_str.c_str());
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110 | sprintf(buffer, "%s", line);
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111 |
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112 | // mark processors as busy
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113 | incoming[dest] = 'B';
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114 | // send out the job to the processor
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115 | cerr << " - asking worker to start" << endl;
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116 | MPI_Send (&buffer, strlen (buffer)+1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD);
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117 | // wait for a done acknowledgement
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118 | MPI_Irecv (&incoming[dest], 1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD, &request[dest]);
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119 | cerr << " - worker replied that it has started" << endl;
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120 | // update counter of actual tasks
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121 | if (dest > actualTasks)
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122 | {
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123 | actualTasks = dest;
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124 | cerr << " - increased the number of running workers to: " << actualTasks << endl;
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125 | }
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126 | }
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127 | }
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128 |
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129 | infile.close();
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130 |
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131 | // wait until all outstanding tasks are completed
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132 | cerr << " - waiting for all outstanding tasks to complete" << endl;
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133 | int dest;
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134 | for ( int k=0; k<actualTasks; k++ )
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135 | {
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136 | MPI_Waitany (actualTasks, request, &dest, status);
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137 | }
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138 |
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139 | // send message to end all processing engines
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140 | cerr << " * Master asking children to exit" << endl;
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141 | char endstr[5] = "end";
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142 | for ( int i=1; i<numtasks; i++ )
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143 | {
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144 | MPI_Send (endstr, 4, MPI_CHAR, i, 1, MPI_COMM_WORLD);
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145 | }
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146 |
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147 | }
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148 | // slave node processing
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149 | else
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150 | {
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151 | ///out << "Worker Starting" << endl;
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152 | char incoming[BUFFERSIZE];
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153 |
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154 | int counter = 0;
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155 |
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156 | do
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157 | {
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158 | // wait for instruction from master
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159 | int resval = MPI_Recv (&incoming, BUFFERSIZE, MPI_CHAR, 0, 1, MPI_COMM_WORLD, &stat);
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160 | if (resval != MPI_SUCCESS)
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161 | {
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162 | printf ("Error when recieving message from master [%d]... Terminating.\n", resval);
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163 | MPI_Abort(MPI_COMM_WORLD, rc);
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164 | }
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165 | counter++;
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166 | if (strcmp (incoming, "end") != 0)
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167 | {
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168 | // process a received job
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169 | cerr << "Worker Processing [" << rank << ":" << incoming << "]" << endl;
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170 |
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171 | // create DSpace filter-media command
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172 | // - incoming now contains the identifier of the item to filter
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173 | char command[2048];
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174 |
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175 | sprintf (command, "%s/bin/dspace filter-media -f -i \"%s\" > /tmp/dspace_media_filter-P%d-C%d.log 2>&1", dspacehomedir, incoming, rank, counter);
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176 |
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177 | cerr << "**** cmd = " << command << endl;
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178 |
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179 | // invoke dspace
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180 | system (command);
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181 | cerr << "**** complete" << endl;
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182 | char line = ' ';
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183 | // send completed message
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184 | MPI_Send (&line, 1, MPI_CHAR, 0, 1, MPI_COMM_WORLD);
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185 | }
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186 | }
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187 | while (strcmp (incoming, "end") != 0);
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188 | // stop when "end" instruction is received
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189 | cerr << "Worker Exiting" << endl;
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190 | }
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191 |
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192 | // clean up MPI environment
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193 | cerr << "Finalizing..." << endl;
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194 | MPI_Finalize();
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195 | }
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