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 | // 2011MAR - added a bunch of commands to aid (my) understanding.
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9 | // - made site argument optional to support GS2.
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10 | // - moving manifest writing code into the rank=0 thread. This will
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11 | // remove the artificial limit on epoc size caused by size of
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12 | // message buffer between controller and child threads. [jmt12]
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13 | // 2011SEP - changing where the manifest files are written so I have the
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14 | // ability to set up the location as a RAMDisk. [jmt12]
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15 |
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16 | #include "mpi.h"
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17 |
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18 | #include <stdio.h>
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19 | #include <stdlib.h>
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20 |
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21 | #include <fstream>
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22 | #include <iostream>
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23 | #include <sstream>
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24 | #include <string>
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25 | #include <vector>
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26 |
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27 | using namespace std;
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28 |
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29 | #define BUFFERSIZE 512
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30 |
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31 | int
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32 | main ( int argc, char *argv [] )
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33 | {
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34 | int numtasks, rank, rc; // MPI variables
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35 |
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36 | if (5 != argc && argc != 6 )
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37 | {
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38 | cerr << "Usage: " << argv[0] << " filelist epoch gsdlhome collection [site]" << endl;
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39 | exit(-1);
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40 | }
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41 |
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42 | char *filelist = argv[1]; // list of filenames
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43 | char *epochStr = argv[2]; // number of files per task
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44 | int epoch = atoi (epochStr);
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45 | char *gsdlhomedir = argv[3]; // location of import script
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46 | char *collection = argv[4]; // Greenstone collection
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47 | char *site = "";
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48 | if (argc == 6)
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49 | {
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50 | site = argv[5]; // Greenstone site
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51 | }
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52 |
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53 | // start MPI environment
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54 | rc = MPI_Init(&argc,&argv);
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55 | if (rc != MPI_SUCCESS)
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56 | {
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57 | printf ("Error starting MPI program. Terminating.\n");
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58 | MPI_Abort(MPI_COMM_WORLD, rc);
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59 | }
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60 |
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61 | // We'll handle errors ourselves
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62 | MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
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63 |
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64 | // get MPI variables: number of processors and processor number
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65 | MPI_Status stat;
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66 | MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
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67 | MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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68 |
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69 | // master node processing
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70 | if (rank == 0)
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71 | {
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72 | char incoming[BUFFERSIZE]; // buffer for acknowledgments
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73 | char buffer[BUFFERSIZE]; // buffer to send tasks
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74 | MPI_Request request[BUFFERSIZE]; // request monitor for all tasks
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75 | MPI_Status status[BUFFERSIZE]; // status monitor for all tasks
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76 | int actualTasks = 0; // number of processors running
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77 |
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78 | vector<char *> manifest_files; // Keep track of temp manifest filenames
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79 |
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80 | // open file listing filenames to process
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81 | ifstream infile;
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82 | infile.open (filelist);
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83 | string line;
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84 |
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85 | // set initial status of all processors to idle
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86 | for ( int j=0; j<BUFFERSIZE; j++ )
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87 | {
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88 | incoming[j] = ' ';
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89 | }
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90 |
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91 | // scan through contents of file listing
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92 | int manifest_file_count = 1;
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93 | while (!infile.eof ())
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94 | {
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95 | // get a filename
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96 | getline (infile, line);
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97 | if (line.length() > 0)
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98 | {
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99 | // search for idle processor
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100 | int dest=0;
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101 | int found = 0;
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102 | while ((dest<(numtasks-1)) && (found == 0))
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103 | {
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104 | if (incoming[dest] == ' ')
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105 | {
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106 | found = 1;
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107 | }
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108 | else
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109 | {
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110 | dest++;
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111 | }
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112 | }
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113 |
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114 | // if no idle processor, wait for one to become idle
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115 | if (found == 0)
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116 | {
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117 | MPI_Waitany (numtasks-1, request, &dest, status);
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118 | }
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119 |
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120 | // construct manifest filename
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121 | stringstream manifestfilename_strstr;
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122 | manifestfilename_strstr << gsdlhomedir << "/collect/" << collection << "/tmp/manifest." << manifest_file_count << ".xml";
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123 | string manifestfilename_str = manifestfilename_strstr.str();
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124 | char *manifestfilename = new char [manifestfilename_str.size() + 1];
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125 | strcpy(manifestfilename, manifestfilename_str.c_str());
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126 | ofstream manifestfile;
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127 | if (manifestfilename != NULL)
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128 | {
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129 | // create manifest file
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130 | manifestfile.open (manifestfilename);
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131 | if (manifestfile.fail())
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132 | {
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133 | cerr << "Fatal Error! Failed to open temporary manifest file for writing: " << manifestfile << endl;
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134 | }
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135 | }
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136 | else
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137 | {
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138 | cerr << "Fatal Error! Failed to open temporary manifest file for writing: " << manifestfile << endl;
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139 | }
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140 | manifestfile << "<Manifest><Index>" << endl;
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141 |
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142 | // add the first filename to the instruction
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143 | manifestfile << "<Filename>" << line << "</Filename>" << endl;
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144 | int epochCounter = epoch;
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145 |
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146 | // if epoch>1 and more filenames, add more filenames
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147 | while ((epochCounter > 1) && (!infile.eof ()))
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148 | {
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149 | getline (infile, line);
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150 | if (line.length () > 0)
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151 | {
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152 | manifestfile << "<Filename>" << line << "</Filename>" << endl;
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153 | epochCounter--;
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154 | }
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155 | }
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156 |
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157 | manifestfile << "</Index></Manifest>" << endl;
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158 | manifestfile.close ();
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159 |
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160 | // Store manifest filepath so we can remove it later
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161 | manifest_files.push_back(manifestfilename);
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162 |
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163 | // Send the manifest filename as the instruction
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164 | sprintf(buffer, "%s", manifestfilename);
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165 |
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166 | // mark processors as busy
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167 | incoming[dest] = 'B';
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168 | // send out the job to the processor
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169 | MPI_Send (&buffer, strlen (buffer)+1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD);
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170 | // wait for a done acknowledgement
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171 | MPI_Irecv (&incoming[dest], 1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD, &request[dest]);
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172 | // update counter of actual tasks
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173 | if (dest > actualTasks)
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174 | {
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175 | actualTasks = dest;
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176 | }
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177 | // increase number of manifest files processed
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178 | manifest_file_count++;
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179 | }
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180 | }
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181 |
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182 | infile.close();
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183 |
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184 | // wait until all outstanding tasks are completed
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185 | int dest;
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186 | for ( int k=0; k<actualTasks; k++ )
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187 | {
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188 | MPI_Waitany (actualTasks, request, &dest, status);
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189 | }
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190 |
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191 | // send message to end all processing engines
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192 | char endstr[5] = "end";
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193 | for ( int i=1; i<numtasks; i++ )
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194 | {
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195 | MPI_Send (endstr, 4, MPI_CHAR, i, 1, MPI_COMM_WORLD);
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196 | }
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197 |
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198 | // Free up manifest files
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199 | for ( int i = 0; i < manifest_files.size(); i++)
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200 | {
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201 | free(manifest_files[i]);
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202 | }
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203 |
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204 | }
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205 | // slave node processing
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206 | else
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207 | {
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208 | char incoming[BUFFERSIZE];
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209 |
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210 | do
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211 | {
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212 | // wait for instruction from master
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213 | int resval = MPI_Recv (&incoming, BUFFERSIZE, MPI_CHAR, 0, 1, MPI_COMM_WORLD, &stat);
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214 | if (resval != MPI_SUCCESS)
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215 | {
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216 | printf ("Error when recieving message from master [%d]... Terminating.\n", resval);
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217 | MPI_Abort(MPI_COMM_WORLD, rc);
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218 | }
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219 | if (strcmp (incoming, "end") != 0)
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220 | {
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221 | // process a received job
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222 | cout << "Processing [" << rank << ":" << incoming << "]" << endl;
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223 |
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224 | // create Greenstone import command
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225 | // - incoming now contains the name of the manifest file to process
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226 | char command[2048];
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227 | if (site != "")
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228 | {
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229 | sprintf (command, "%s/bin/script/import.pl -keepold -manifest %s -site %s %s", gsdlhomedir, incoming, site, collection);
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230 | }
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231 | else
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232 | {
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233 | sprintf (command, "%s/bin/script/import.pl -keepold -manifest %s %s", gsdlhomedir, incoming, collection);
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234 | }
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235 | cout << "**** cmd = " << command << endl;
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236 |
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237 | // invoke Greenstone import with manifest file
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238 | system (command);
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239 |
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240 | char line = ' ';
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241 | // send completed message
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242 | MPI_Send (&line, 1, MPI_CHAR, 0, 1, MPI_COMM_WORLD);
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243 | }
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244 | }
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245 | while (strcmp (incoming, "end") != 0);
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246 | // stop when "end" instruction is received
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247 | }
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248 |
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249 | // clean up MPI environment
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250 | MPI_Finalize();
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251 | }
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