[25810] | 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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