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/* [ICS VERSION STRING: unknown] */
/*
* The purpose of these programs (pgfile_test1 and pgfile_test2)
* is to demonstrate how to use the pgfile capability in mpirun_rsh.
*
* pgfile_test1 should be the first program in the pgfile. It accepts
* numeric arguments from the pgfile and passes them to the next program in
* the pgfile, which should be pgfile_test2.
*
* pgfile_test2 accepts a message containing a set of numbers from the previous
* program in the pgfile, adds them to its own arguments and passes the
* result to the following program. The last instance then passes its result
* back to pgfile_test1, which prints the final result.
*/
#include <stdio.h>
#include <mpi.h>
main(int argc, char *argv[])
{
int my_rank;
int n, num_tasks, i, final_n, msgtype;
float data[100], result[100];
char sbuff[1000], rbuff[1000];
int position;
MPI_Status status;
/* Initialize MPI */
MPI_Init(&argc, &argv);
/* Get our task id (our rank in the basic group) */
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
/* Get the number of MPI tasks and slaves */
MPI_Comm_size(MPI_COMM_WORLD, &num_tasks);
if (my_rank != 0) {
fprintf(stderr,"%s should only be the first program.\n",argv[0]);
return -1;
}
fprintf(stderr,"num_tasks = %d\n",num_tasks);
/* Begin User Program */
/* actual argument run from 1 to argc. */
n = (argc < 100)?argc:100;
for( i=1 ; i<n ; i++ ){
data[i-1] = (float)atoi(argv[i]);
}
n--; /* drop count by 1 to account for argv[0] */
/* Pack initial data to be sent to slave tasks */
position = 0;
MPI_Pack(&n, 1, MPI_INT, sbuff, 1000, &position,
MPI_COMM_WORLD);
MPI_Pack(data, 100, MPI_FLOAT, sbuff, 1000, &position,
MPI_COMM_WORLD);
/* Send initial data to next task */
fprintf(stderr,"task 0 sending to task 1.\n");
msgtype = 0;
MPI_Send(sbuff, position, MPI_PACKED, 1, msgtype,
MPI_COMM_WORLD);
/* Wait for results from slaves */
fprintf(stderr,"task 0 waiting for message from task %d.\n",num_tasks-1);
msgtype = 0;
MPI_Recv(rbuff, 1000, MPI_PACKED, num_tasks-1,
msgtype, MPI_COMM_WORLD, &status);
position = 0;
MPI_Unpack(rbuff, 1000, &position, &final_n, 1, MPI_INT,
MPI_COMM_WORLD);
MPI_Unpack(rbuff, 1000, &position, result, final_n,
MPI_FLOAT, MPI_COMM_WORLD);
fprintf(stderr,"Final Results: final_n = %d\n",final_n);
if (final_n != n) {
fprintf(stderr,"Failed sanity test. n != final_n.\n");
return -1;
}
for( i=0 ; i<n ; i++ ){
fprintf(stderr,"%d: %6.2f\n",i, result[i]);
}
/* Program Finished. Exit MPI before stopping */
MPI_Barrier(MPI_COMM_WORLD);
MPI_Finalize();
}