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 | #include <time.h>
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21 |
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22 | #include <fstream>
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23 | #include <iostream>
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24 | #include <sstream>
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25 | #include <string>
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26 | #include <vector>
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27 |
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28 | using namespace std;
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29 |
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30 | //#define HARDAFFINITY 1
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31 | #define BUFFERSIZE 512
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32 |
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33 | #if defined _WIN32 || defined __CYGWIN__
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34 | const char path_sep = '\\';
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35 | #else
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36 | const char path_sep = '/';
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37 | #endif
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38 |
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39 | int
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40 | main ( int argc, char *argv [] )
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41 | {
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42 | int numtasks, rank, rc; // MPI variables
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43 | unsigned long int seconds = 0;
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44 |
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45 | if (5 != argc && argc != 6 )
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46 | {
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47 | fprintf(stderr, "Usage: mpiimport filelist epoch gsdlhome collection [site]\n");
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48 | exit(-1);
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49 | }
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50 |
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51 | char *filelist = argv[1]; // list of filenames
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52 | char *epochStr = argv[2]; // number of files per task
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53 | int epoch = atoi (epochStr);
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54 | char *gsdlhomedir = argv[3]; // location of import script
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55 | char *collection = argv[4]; // Greenstone collection
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56 | char *site = NULL;
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57 | if (argc == 6)
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58 | {
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59 | site = argv[5]; // Greenstone site
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60 | }
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61 |
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62 | // start MPI environment
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63 | rc = MPI_Init(&argc,&argv);
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64 | if (rc != MPI_SUCCESS)
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65 | {
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66 | fprintf(stderr, "Error starting MPI program. Terminating.\n");
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67 | MPI_Abort(MPI_COMM_WORLD, rc);
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68 | }
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69 |
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70 | // We'll handle errors ourselves
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71 | MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
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72 |
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73 | // get MPI variables: number of processors and processor number
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74 | MPI_Status stat;
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75 | MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
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76 | MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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77 |
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78 | // Get processor name too - important when it could be anywhere in a cluster
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79 | int name_length;
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80 | char processor_name[MPI_MAX_PROCESSOR_NAME];
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81 | MPI_Get_processor_name(processor_name, &name_length);
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82 |
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83 | // master node processing
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84 | if (rank == 0)
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85 | {
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86 | seconds = time(NULL);
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87 | fprintf(stderr, "[M:%lu] Starting on %s\n", seconds, processor_name);
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88 | char incoming[BUFFERSIZE]; // buffer for acknowledgments
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89 | char buffer[BUFFERSIZE]; // buffer to send tasks
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90 | MPI_Request request[BUFFERSIZE]; // request monitor for all tasks
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91 | MPI_Status status[BUFFERSIZE]; // status monitor for all tasks
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92 | int actualTasks = 0; // number of processors running
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93 |
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94 | vector<char *> manifest_files; // Keep track of temp manifest filenames
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95 |
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96 | // open file listing filenames to process
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97 | ifstream infile;
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98 | infile.open (filelist);
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99 | string line;
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100 |
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101 | // set initial status of all processors to idle
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102 | fprintf(stderr, "[M] Initializing processor state\n");
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103 | for ( int j=0; j<BUFFERSIZE; j++ )
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104 | {
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105 | incoming[j] = ' ';
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106 | }
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107 |
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108 | // scan through contents of file listing
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109 | int manifest_file_count = 1;
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110 | fprintf(stderr, "[M] Processing contents of filelist.txt\n");
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111 | while (!infile.eof ())
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112 | {
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113 | // get a filename
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114 | getline (infile, line);
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115 |
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116 | if ( line.length() == 0 && !infile.eof() )
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117 | {
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118 | fprintf(stderr, "[M] Warning! Read empty string from filelist: %s", filelist);
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119 | }
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120 |
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121 | if (line.length() > 0)
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122 | {
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123 | // search for idle processor
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124 | int dest=0;
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125 | int found = 0;
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126 | fprintf(stderr, "[M] Searching for idle processor\n");
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127 | while ((dest<(numtasks-1)) && (found == 0))
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128 | {
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129 | if (incoming[dest] == ' ')
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130 | {
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131 | found = 1;
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132 | }
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133 | else
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134 | {
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135 | dest++;
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136 | }
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137 | }
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138 |
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139 | // if no idle processor, wait for one to become idle
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140 | if (found == 0)
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141 | {
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142 | fprintf(stderr, "[M] Waiting for processor to become idle\n");
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143 | MPI_Waitany (numtasks-1, request, &dest, status);
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144 | }
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145 |
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146 | // construct manifest filename
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147 | fprintf(stderr, "[M] Creating manifest file: %d\n", manifest_file_count);
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148 | stringstream manifestfilename_strstr;
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149 | if (site == NULL) {
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150 | manifestfilename_strstr << gsdlhomedir << path_sep << "collect" << path_sep << collection << path_sep << "tmp" << path_sep << "manifest." << manifest_file_count << ".xml";
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151 | }
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152 | else {
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153 | manifestfilename_strstr << gsdlhomedir << path_sep << "web" << path_sep << "sites" << path_sep << site << path_sep << "collect" << path_sep << collection << path_sep << "tmp" << path_sep << "manifest." << manifest_file_count << ".xml";
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154 | }
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155 |
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156 | string manifestfilename_str = manifestfilename_strstr.str();
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157 | char *manifestfilename = new char [manifestfilename_str.size() + 1];
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158 | strcpy(manifestfilename, manifestfilename_str.c_str());
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159 | ofstream manifestfile;
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160 | if (manifestfilename != NULL)
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161 | {
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162 | // create manifest file
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163 | manifestfile.open (manifestfilename);
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164 | if (manifestfile.fail())
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165 | {
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166 | fprintf(stderr, "[M] Fatal Error! Failed to open temporary manifest file for writing: %s\n", manifestfilename);
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167 | }
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168 | }
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169 | else
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170 | {
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171 | fprintf(stderr, "[M] Fatal Error! Failed to open temporary manifest file for writing: %s\n", manifestfilename);
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172 | }
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173 | manifestfile << "<Manifest version=\"2\"><Index>" << endl;
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174 |
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175 | // add the first filename to the instruction
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176 | manifestfile << "<Filename>" << line << "</Filename>" << endl;
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177 | int epochCounter = epoch;
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178 |
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179 | // if epoch>1 and more filenames, add more filenames
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180 | while ((epochCounter > 1) && (!infile.eof ()))
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181 | {
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182 | getline (infile, line);
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183 | if (line.length () > 0)
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184 | {
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185 | manifestfile << "<Filename>" << line << "</Filename>" << endl;
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186 | epochCounter--;
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187 | }
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188 | }
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189 |
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190 | manifestfile << "</Index></Manifest>" << endl;
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191 | manifestfile.close ();
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192 |
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193 | fprintf(stderr, "[M0] Manifest file complete\n");
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194 |
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195 | // Store manifest filepath so we can remove it later
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196 | manifest_files.push_back(manifestfilename);
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197 |
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198 | // Send the manifest filename as the instruction
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199 | fprintf(stderr, "[M0] Writing manifest filename as instruction to worker\n");
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200 | sprintf(buffer, "%s", manifestfilename);
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201 |
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202 | // mark processors as busy
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203 | incoming[dest] = 'B';
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204 | // send out the job to the processor
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205 | fprintf(stderr, "[M0] Asking worker %d to start\n", (dest + 1));
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206 | MPI_Send (&buffer, strlen (buffer)+1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD);
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207 | // wait for a done acknowledgement
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208 | MPI_Irecv (&incoming[dest], 1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD, &request[dest]);
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209 | fprintf(stderr, "[M0] Worker %d replied that it has started\n", (dest + 1));
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210 | // update counter of actual tasks
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211 | if (dest > actualTasks)
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212 | {
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213 | actualTasks = dest;
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214 | fprintf(stderr, "[M0] Increased the number of running workers to: %d\n", actualTasks);
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215 | }
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216 | // increase number of manifest files processed
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217 | manifest_file_count++;
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218 | }
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219 | }
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220 |
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221 | infile.close();
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222 |
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223 | // wait until all outstanding tasks are completed
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224 | fprintf(stderr, "[M0] Waiting for all outstanding tasks to complete\n");
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225 | int dest;
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226 | for ( int k=0; k<actualTasks; k++ )
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227 | {
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228 | MPI_Waitany (actualTasks, request, &dest, status);
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229 | }
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230 |
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231 | // send message to end all processing engines
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232 | fprintf(stderr, "[M0] Master asking children to exit\n");
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233 | char endstr[5] = "end";
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234 | for ( int i=1; i<numtasks; i++ )
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235 | {
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236 | MPI_Send (endstr, 4, MPI_CHAR, i, 1, MPI_COMM_WORLD);
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237 | }
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238 |
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239 | // Free up manifest files
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240 | fprintf(stderr, "[M0] Freeing shared memory used by manifest files\n");
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241 | for ( int i = 0; i < manifest_files.size(); i++)
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242 | {
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243 | free(manifest_files[i]);
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244 | }
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245 | seconds = time(NULL);
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246 | fprintf(stderr, "[M0:%lu] Master will exit when workers complete\n", seconds);
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247 | }
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248 | // worker node processing
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249 | else
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250 | {
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251 | seconds = time(NULL);
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252 | fprintf(stderr, "[W%d:%lu] Starting on %s\n", rank, seconds, processor_name);
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253 |
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254 | // Check to see if GSDLHOME exists in the environment (it will on multicore
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255 | // computer, but won't on compute nodes in a cluster). It will be NULL if
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256 | // source setup.bash hasn't been run (on this computer).
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257 | const char * gsdlhometest = getenv("GSDLHOME");
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258 |
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259 | char incoming[BUFFERSIZE];
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260 | int counter = 0;
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261 | do
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262 | {
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263 | // wait for instruction from master
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264 | int resval = MPI_Recv (&incoming, BUFFERSIZE, MPI_CHAR, 0, 1, MPI_COMM_WORLD, &stat);
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265 | if (resval != MPI_SUCCESS)
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266 | {
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267 | fprintf(stderr, "[W%d] Error when recieving message from master... terminating (%d).\n", rank, resval);
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268 | MPI_Abort(MPI_COMM_WORLD, rc);
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269 | }
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270 | counter++;
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271 | fprintf(stderr, "[W%d] Received: %s", rank, incoming);
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272 | if (strcmp (incoming, "end") != 0)
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273 | {
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274 | // process a received job
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275 | seconds = time(NULL);
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276 | fprintf(stderr, "[W%d:%lu] Processing: %s (%d)\n", rank, seconds, incoming, counter);
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277 | // create Greenstone import command
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278 | // - incoming now contains the name of the manifest file to process
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279 | char command[2048];
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280 | #ifdef HARDAFFINITY
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281 | int cpu = rank - 1;
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282 | fprintf(stderr, "[W%d] Affinity fixed to CPU %d", rank, cpu);
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283 | char affinity[16];
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284 | sprintf(affinity, "taskset -c %d", cpu);
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285 | #else
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286 | char affinity[16] = "";
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287 | #endif
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288 |
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289 | // In the commands below, need to consider Windows. In particular:
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290 | // /dev/null => NUL
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291 | // /tmp/file.log => %temp%\\file.log
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292 | // But we'll also have issues with affinity and source bash files
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293 | if (site != NULL && strlen(site) > 0)
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294 | {
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295 | if (gsdlhometest != NULL)
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296 | {
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297 | sprintf(command, "%s import.pl -keepold -manifest %s -site %s %s > /tmp/gsimport-W%d-%d.log 2>&1", affinity, incoming, site, collection, rank, counter);
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298 | }
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299 | else
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300 | {
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301 | sprintf(command, "bash -c \"cd %s && source setup.bash > /dev/null && %s import.pl -verbosity 0 -keepold -manifest %s -site %s %s > /tmp/gsimport-W%d-%d.log 2>&1\"", gsdlhomedir, affinity, incoming, site, collection, rank, counter);
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302 | }
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303 | }
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304 | else if (gsdlhometest != NULL)
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305 | {
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306 | sprintf(command, "%s import.pl -keepold -manifest %s %s > /tmp/gsimport-W%d-%d.log 2>&1", affinity, incoming, collection, rank, counter);
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307 | }
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308 | else
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309 | {
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310 | sprintf(command, "bash -c \"cd %s && source setup.bash > /dev/null && %s import.pl -keepold -manifest %s %s > /tmp/gsimport-W%d-%d.log 2>&1\"", gsdlhomedir, affinity, incoming, collection, rank, counter);
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311 | }
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312 |
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313 | fprintf(stderr, "[W%d] system('%s')\n", rank, command);
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314 |
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315 | // invoke Greenstone import with manifest file
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316 | system (command);
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317 | seconds = time(NULL);
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318 | fprintf(stderr, "[W%d:%lu] Process complete\n", rank, seconds);
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319 | char line = ' ';
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320 | // send completed message
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321 | MPI_Send (&line, 1, MPI_CHAR, 0, 1, MPI_COMM_WORLD);
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322 | }
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323 | }
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324 | while (strcmp (incoming, "end") != 0);
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325 | // stop when "end" instruction is received
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326 | seconds = time(NULL);
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327 | fprintf(stderr, "[W%d:%lu] Worker exiting\n", rank, seconds);
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328 | }
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329 | ///err << "Finalizing..." << endl;
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330 | MPI_Finalize();
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331 | }
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