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54 lines
1.5 KiB
54 lines
1.5 KiB
4 years ago
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#include "mpi.h"
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#include <stdio.h>
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#include <string.h>
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#define BUFLEN 512
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int main(int argc, char *argv[])
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{
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int myid, numprocs, next, namelen;
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char buffer[BUFLEN], processor_name[MPI_MAX_PROCESSOR_NAME];
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MPI_Status status;
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MPI_Init(&argc,&argv);
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MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
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MPI_Comm_rank(MPI_COMM_WORLD,&myid);
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MPI_Get_processor_name(processor_name,&namelen);
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fprintf(stderr,"Process %d on %s\n", myid, processor_name);
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strcpy(buffer,"hello there");
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if (myid == numprocs-1)
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next = 0;
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else
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next = myid+1;
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if (myid == 0)
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{
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printf("%d sending '%s' \n",myid,buffer);
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MPI_Send(buffer, strlen(buffer)+1, MPI_CHAR, next, 99, MPI_COMM_WORLD);
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MPI_Send(buffer, strlen(buffer)+1, MPI_CHAR, MPI_PROC_NULL, 299, MPI_COMM_WORLD);
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printf("%d receiving \n",myid);
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MPI_Recv(buffer, BUFLEN, MPI_CHAR, MPI_ANY_SOURCE, 99, MPI_COMM_WORLD,
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&status);
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printf("%d received '%s' \n",myid,buffer);
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/* mpdprintf(001,"%d receiving \n",myid); */
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}
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else
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{
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printf("%d receiving \n",myid);
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MPI_Recv(buffer, BUFLEN, MPI_CHAR, MPI_ANY_SOURCE, 99, MPI_COMM_WORLD,
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&status);
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MPI_Recv(buffer, BUFLEN, MPI_CHAR, MPI_PROC_NULL, 299, MPI_COMM_WORLD,
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&status);
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printf("%d received '%s' \n",myid,buffer);
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/* mpdprintf(001,"%d receiving \n",myid); */
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MPI_Send(buffer, strlen(buffer)+1, MPI_CHAR, next, 99, MPI_COMM_WORLD);
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printf("%d sent '%s' \n",myid,buffer);
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}
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MPI_Barrier(MPI_COMM_WORLD);
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MPI_Finalize();
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return (0);
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}
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