hi,
hello.c program is as follows:
#include<stdio.h>
#include<mpi.h>
int main(int argc,char* argv[]){
int rank,size;
MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
MPI_Comm_size(MPI_COMM_WORLD,&size);
printf("Hello World %d of %d \n",rank,size);
MPI_Finalize();
printf("After final...");
return 0;
}
Lam-mpi is configured on 4 systems.
The command lamnodes gave:
n0 master.mec.ac.in:1:origin,this_node
n1 node-1.mec.ac.in:1:
n2 node-2.mec.ac.in:1:
n3 node-3.mec.ac.in:1:
When we do mpirun -np 4 a.out after mpicc test.c -lmpi having compiled
successfully we are getting the following output:
Hello World 0 of 4
Hello World 2 of 4
After final...Afterfinal...
Then we did mpirun -np 8 a.out and got output as follows
Hello World 0 of 8
Hello World 4 of 8
After final...Hello World 2 of 8
Hello World 6 of 8
After final...After final...After final...
Then we did lamshrink n1 .
Then mpirun -np 8 a.out
Hello World 3 of 8
Hello World 1 of 8
Hello World 4 of 8
Hello World 7 of 8
After final...After final...After final...After final...Hello World 0 of 8
After final...Hello World 6 of 8
It seems that the nodes node-1 and node-3 is not printing any message
although communication between the nodes by means of message parsing is
taking place and lam is properly installed in all 4 nodes.
What could be the reason? Please suggest a solution.
Thank u.
--
CE 2002-06
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