[24589] | 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. jmt12
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| 9 | // - made site argument optional to support GS2. jmt12
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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 |
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| 14 | #include "mpi.h"
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include <stdlib.h>
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| 18 |
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| 19 | #include <fstream>
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| 20 | #include <iostream>
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| 21 | #include <string>
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| 22 | #include <vector>
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| 23 |
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| 24 | using namespace std;
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| 25 |
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| 26 | #define BUFFERSIZE 512
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| 27 |
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| 28 | int
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| 29 | main ( int argc, char *argv [] )
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| 30 | {
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| 31 | int numtasks, rank, rc; // MPI variables
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| 32 |
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| 33 | if (5 != argc && argc != 6 )
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| 34 | {
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| 35 | cerr << "Usage: " << argv[0] << " filelist epoch gsdlhome collection [site]" << endl;
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| 36 | exit(-1);
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| 37 | }
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| 38 |
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| 39 | char *filelist = argv[1]; // list of filenames
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| 40 | char *epochStr = argv[2]; // number of files per task
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| 41 | int epoch = atoi (epochStr);
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| 42 | char *gsdlhomedir = argv[3]; // location of import script
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| 43 | char *collection = argv[4]; // Greenstone collection
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| 44 | char *site = "";
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| 45 | if (argc == 6)
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| 46 | {
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| 47 | site = argv[5]; // Greenstone site
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| 48 | }
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| 49 |
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| 50 | // start MPI environment
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| 51 | rc = MPI_Init(&argc,&argv);
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| 52 | if (rc != MPI_SUCCESS)
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| 53 | {
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| 54 | printf ("Error starting MPI program. Terminating.\n");
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| 55 | MPI_Abort(MPI_COMM_WORLD, rc);
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| 56 | }
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| 57 |
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| 58 | // We'll handle errors ourselves
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| 59 | MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
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| 60 |
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| 61 | // get MPI variables: number of processors and processor number
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| 62 | MPI_Status stat;
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| 63 | MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
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| 64 | MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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| 65 |
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| 66 | // master node processing
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| 67 | if (rank == 0)
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| 68 | {
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| 69 | char incoming[BUFFERSIZE]; // buffer for acknowledgments
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| 70 | char buffer[BUFFERSIZE]; // buffer to send tasks
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| 71 | MPI_Request request[BUFFERSIZE]; // request monitor for all tasks
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| 72 | MPI_Status status[BUFFERSIZE]; // status monitor for all tasks
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| 73 | int actualTasks = 0; // number of processors running
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| 74 |
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| 75 | vector<char *> manifest_files; // Keep track of temp manifest filenames
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| 76 |
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| 77 | // open file listing filenames to process
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| 78 | ifstream infile;
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| 79 | infile.open (filelist);
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| 80 | string line;
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| 81 |
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| 82 | // set initial status of all processors to idle
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| 83 | for ( int j=0; j<BUFFERSIZE; j++ )
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| 84 | {
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| 85 | incoming[j] = ' ';
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| 86 | }
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| 87 |
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| 88 | // scan through contents of file listing
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| 89 | while (!infile.eof ())
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| 90 | {
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| 91 | // get a filename
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| 92 | getline (infile, line);
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| 93 | if (line.length() > 0)
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| 94 | {
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| 95 | // search for idle processor
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| 96 | int dest=0;
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| 97 | int found = 0;
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| 98 | while ((dest<(numtasks-1)) && (found == 0))
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| 99 | {
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| 100 | if (incoming[dest] == ' ')
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| 101 | {
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| 102 | found = 1;
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| 103 | }
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| 104 | else
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| 105 | {
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| 106 | dest++;
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| 107 | }
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| 108 | }
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| 109 |
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| 110 | // if no idle processor, wait for one to become idle
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| 111 | if (found == 0)
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| 112 | {
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| 113 | MPI_Waitany (numtasks-1, request, &dest, status);
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| 114 | }
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| 115 |
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| 116 | // construct manifest filename
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| 117 | char manifestfile_buffer[128];
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| 118 | sprintf (manifestfile_buffer, "%u.manifest.xml", rank);
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| 119 | char* manifestfilename = tempnam(NULL,manifestfile_buffer);
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| 120 | ofstream manifestfile;
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| 121 | if (manifestfilename != NULL)
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| 122 | {
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| 123 | // create manifest file
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| 124 | manifestfile.open (manifestfilename);
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| 125 | if (manifestfile.fail())
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| 126 | {
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| 127 | cerr << "Fatal Error! Failed to open temporary manifest file for writing: " << manifestfile << endl;
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| 128 | }
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| 129 | }
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| 130 | else
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| 131 | {
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| 132 | cerr << "Fatal Error! Failed to open temporary manifest file for writing: " << manifestfile << endl;
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| 133 | }
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| 134 | manifestfile << "<Manifest><Index>" << endl;
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| 135 |
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| 136 | // add the first filename to the instruction
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| 137 | manifestfile << "<Filename>" << line << "</Filename>" << endl;
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| 138 | int epochCounter = epoch;
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| 139 |
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| 140 | // if epoch>1 and more filenames, add more filenames
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| 141 | while ((epochCounter > 1) && (!infile.eof ()))
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| 142 | {
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| 143 | getline (infile, line);
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| 144 | if (line.length () > 0)
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| 145 | {
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| 146 | manifestfile << "<Filename>" << line << "</Filename>" << endl;
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| 147 | epochCounter--;
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | manifestfile << "</Index></Manifest>" << endl;
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| 152 | manifestfile.close ();
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| 153 |
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| 154 | // Store manifest filepath so we can remove it later
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| 155 | manifest_files.push_back(manifestfilename);
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| 156 |
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| 157 | // Send the manifest filename as the instruction
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| 158 | sprintf(buffer, "%s", manifestfilename);
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| 159 |
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| 160 | // mark processors as busy
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| 161 | incoming[dest] = 'B';
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| 162 | // send out the job to the processor
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| 163 | MPI_Send (&buffer, strlen (buffer)+1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD);
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| 164 | // wait for a done acknowledgement
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| 165 | MPI_Irecv (&incoming[dest], 1, MPI_CHAR, dest+1, 1, MPI_COMM_WORLD, &request[dest]);
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| 166 | // update counter of actual tasks
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| 167 | if (dest > actualTasks)
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| 168 | {
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| 169 | actualTasks = dest;
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| 170 | }
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| 171 | }
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| 172 | }
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| 173 |
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| 174 | infile.close();
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| 175 |
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| 176 | // wait until all outstanding tasks are completed
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| 177 | int dest;
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| 178 | for ( int k=0; k<actualTasks; k++ )
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| 179 | {
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| 180 | MPI_Waitany (actualTasks, request, &dest, status);
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| 181 | }
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| 182 |
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| 183 | // send message to end all processing engines
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| 184 | char endstr[5] = "end";
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| 185 | for ( int i=1; i<numtasks; i++ )
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| 186 | {
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| 187 | MPI_Send (endstr, 4, MPI_CHAR, i, 1, MPI_COMM_WORLD);
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| 188 | }
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| 189 |
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| 190 | // Free up manifest files
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| 191 | for ( int i = 0; i < manifest_files.size(); i++)
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| 192 | {
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| 193 | free(manifest_files[i]);
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| 194 | }
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| 195 |
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| 196 | }
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| 197 | // slave node processing
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| 198 | else
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| 199 | {
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| 200 | char incoming[BUFFERSIZE];
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| 201 |
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| 202 | do
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| 203 | {
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| 204 | // wait for instruction from master
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| 205 | int resval = MPI_Recv (&incoming, BUFFERSIZE, MPI_CHAR, 0, 1, MPI_COMM_WORLD, &stat);
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| 206 | if (resval != MPI_SUCCESS)
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| 207 | {
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| 208 | printf ("Error when recieving message from master [%d]... Terminating.\n", resval);
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| 209 | MPI_Abort(MPI_COMM_WORLD, rc);
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| 210 | }
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| 211 | if (strcmp (incoming, "end") != 0)
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| 212 | {
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| 213 | // process a received job
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| 214 | cout << "Processing [" << rank << ":" << incoming << "]" << endl;
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| 215 |
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| 216 | // create Greenstone import command
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| 217 | // - incoming now contains the name of the manifest file to process
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| 218 | char command[2048];
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| 219 | if (site != "")
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| 220 | {
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| 221 | sprintf (command, "%s/bin/script/import.pl -keepold -manifest %s -site %s %s", gsdlhomedir, incoming, site, collection);
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| 222 | }
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| 223 | else
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| 224 | {
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| 225 | sprintf (command, "%s/bin/script/import.pl -keepold -manifest %s %s", gsdlhomedir, incoming, collection);
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| 226 | }
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| 227 | cout << "**** cmd = " << command << endl;
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| 228 |
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| 229 | // invoke Greenstone import with manifest file
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| 230 | system (command);
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| 231 |
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| 232 | char line = ' ';
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| 233 | // send completed message
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| 234 | MPI_Send (&line, 1, MPI_CHAR, 0, 1, MPI_COMM_WORLD);
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| 235 | }
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| 236 | }
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| 237 | while (strcmp (incoming, "end") != 0);
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| 238 | // stop when "end" instruction is received
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| 239 | }
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| 240 |
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| 241 | // clean up MPI environment
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| 242 | MPI_Finalize();
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| 243 | }
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