1 | // Master-worker program to read in a list of files and invoke
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2 | // import on each separately using manifest files in Greenstone 3,
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3 | // with synchronisation using OpenMPI
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4 | //
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5 | // hussein suleman
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6 | // 1 july 2010
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7 |
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8 | #include "mpi.h"
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9 |
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10 | #include <stdio.h>
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11 | #include <stdlib.h>
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12 |
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13 | #include <fstream>
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14 | #include <iostream>
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15 | #include <string>
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16 |
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17 | using namespace std;
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18 |
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19 | #define KILOBUF 512
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20 | //#define MEGABUF 655360
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21 | #define MEGABUF 10240
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22 |
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23 | int 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 (argc != 6 ) {
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28 | cerr << "Usage: " << argv[0] << "filelist epoch gsdlhome site collection" << endl;
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29 | exit(-1);
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30 | }
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31 |
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32 | char *filelist = argv[1]; // list of filenames
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33 | char *epochStr = argv[2]; // number of files per task
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34 | int epoch = atoi (epochStr);
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35 | char *gsdlhomedir = argv[3]; // location of import script
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36 | char *site = argv[4]; // Greenstone site
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37 | char *collection = argv[5]; // Greenstone collection
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38 |
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39 | // start MPI environment
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40 | rc = MPI_Init(&argc,&argv);
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41 | if (rc != MPI_SUCCESS) {
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42 | printf ("Error starting MPI program. Terminating.\n");
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43 | MPI_Abort(MPI_COMM_WORLD, rc);
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44 | }
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45 |
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46 | // get MPI variables: number of processors and processor number
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47 | MPI_Status stat;
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48 | MPI_Comm_size(MPI_COMM_WORLD,&numtasks);
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49 | MPI_Comm_rank(MPI_COMM_WORLD,&rank);
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50 |
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51 |
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52 | if (rank == 0)
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53 | // master node processing
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54 | {
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55 | char incoming[KILOBUF]; // buffer for acknowledgments
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56 | char buffer[MEGABUF]; // buffer to send tasks
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57 | MPI_Request request[KILOBUF]; // request monitor for all tasks
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58 | MPI_Status status[KILOBUF]; // status monitor for all tasks
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59 | int actualTasks = 0; // number of processors running
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60 |
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61 | // open file listing filenames to process
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62 | ifstream infile;
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63 | infile.open (filelist);
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64 | string line;
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65 |
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66 | // set initial status of all processors to idle
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67 | for ( int j=0; j<KILOBUF; j++ )
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68 | incoming[j] = ' ';
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69 |
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70 | // scan through contents of file listing
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71 | while (!infile.eof ())
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72 | {
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73 | // get a filename
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74 | getline (infile, line);
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75 | if (line.length() > 0)
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76 | {
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77 | // search for idle processor
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78 | int dest=0;
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79 | int found = 0;
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80 | while ((dest<(numtasks-1)) && (found == 0))
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81 | if (incoming[dest] == ' ')
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82 | found = 1;
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83 | else
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84 | dest++;
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85 |
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86 | // if no idle processor, wait for one to become idle
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87 | if (found == 0) {
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88 | MPI_Waitany (numtasks-1, request, &dest, status);
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89 | }
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90 |
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91 | // add the first filename to the instruction
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92 | sprintf (buffer, "<Filename>%s</Filename>", line.c_str ());
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93 | int epochCounter = epoch;
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94 |
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95 | // if epoch>1 and more filenames, add more filenames
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96 | while ((epochCounter > 1) && (!infile.eof ()))
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97 | {
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98 | getline (infile, line);
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99 | if (line.length () > 0)
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100 | {
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101 | char buffer2[1024];
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102 | sprintf (buffer2, "<Filename>%s</Filename>", line.c_str ());
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103 | strcat (buffer, buffer2);
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104 | }
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105 | epochCounter--;
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106 | }
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107 |
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108 | // mark processors as busy
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109 | incoming[dest] = 'B';
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110 | // send out the job to the processor
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111 | MPI_Send (&buffer, strlen (buffer)+1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD);
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112 | // wait for a done acknowledgement
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113 | MPI_Irecv (&incoming[dest], 1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD, &request[dest]);
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114 | // update counter of actual tasks
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115 | if (dest > actualTasks)
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116 | actualTasks = dest;
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117 | }
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118 | }
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119 |
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120 | infile.close();
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121 |
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122 | // wait until all outstanding tasks are completed
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123 | int dest;
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124 | for ( int k=0; k<actualTasks; k++ )
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125 | MPI_Waitany (actualTasks, request, &dest, status);
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126 |
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127 | // send message to end all processing engines
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128 | char endstr[5] = "end";
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129 | for ( int i=1; i<numtasks; i++ )
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130 | MPI_Send (endstr, 4, MPI_CHAR, i, 1, MPI_COMM_WORLD);
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131 |
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132 | }
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133 | else
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134 | // slave node processing
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135 | {
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136 | char incoming[MEGABUF];
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137 |
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138 | do {
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139 | // wait for instruction from master
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140 | MPI_Recv (&incoming, MEGABUF, MPI_CHAR, 0, 1, MPI_COMM_WORLD, &stat);
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141 | if (strcmp (incoming, "end") != 0)
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142 | {
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143 | // process a received job
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144 | cout << "Processing [" << rank << ":" << incoming << "]" << endl;
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145 |
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146 | // construct manifest filename
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147 | char manifestfile[128];
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148 | sprintf (manifestfile, "%u.manifest.xml", rank);
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149 | char* manifestfilename = tempnam(NULL,manifestfile);
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150 | if (manifestfilename != NULL) {
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151 |
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152 | // create manifest file
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153 | ofstream manifestfile;
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154 | manifestfile.open (manifestfilename);
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155 | manifestfile << "<Manifest><Index>" << incoming << "</Index></Manifest>" << endl;
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156 | manifestfile.close ();
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157 |
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158 | // create Greenstone import command
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159 | char command[2048];
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160 | sprintf (command, "%s\\bin\\script\\import.pl -keepold -manifest %s -site %s %s", gsdlhomedir, manifestfilename, site, collection);
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161 |
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162 | // cout << "**** cmd = " << command << endl;
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163 |
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164 | // invoke Greenstone import with manifest file
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165 | system (command);
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166 |
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167 | char line = ' ';
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168 | // send completed message
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169 | MPI_Send (&line, 1, MPI_CHAR, 0, 1, MPI_COMM_WORLD);
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170 |
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171 | free(manifestfilename);
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172 | }
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173 | else {
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174 | cerr << "Error: Unable to create temporary manifest file for rank=" << rank << endl;
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175 | }
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176 | }
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177 | } while (strcmp (incoming, "end") != 0);
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178 | // stop when "end" instruction is received
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179 |
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180 | }
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181 |
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182 | // clean up MPI environment
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183 | MPI_Finalize();
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184 | }
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185 |
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