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POMPI Error: No output
 

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    <p>The code below is for using 4 nodes to communicate using MPI. I am able to compile it successfully on the cluster using "mpiicpc". </p> <p>However, the output screen just gives me a warning, ‘Warning: Cant read mpd.hosts for list of hosts start only on current’ and hangs. </p> <p>Could you please suggest what the warning means and also if it is the reason why my code hangs?</p> <hr> <pre><code>#include &lt;mpi.h&gt; #include &lt;fstream&gt; using namespace std; #define Cols 96 #define Rows 96 #define beats 1 ofstream fout("Vm0"); ofstream f1out("Vm1"); ..... ..... double V[Cols][Rows]; int r,i,y,ibeat; int my_rank; int p; int source; int dest; int tag = 0; //Allocating Memory double *A = new double[Rows*sizeof(double)]; double *B = new double[Rows*sizeof(double)]; ..... ...... void prttofile (); // MAIN FUNCTION int main (int argc, char *argv[]) { //MPI Commands MPI_Status status; MPI_Request send_request, recv_request; MPI_Init (&amp;argc, &amp;argv); MPI_Comm_rank(MPI_COMM_WORLD, &amp;my_rank); MPI_Comm_size(MPI_COMM_WORLD, &amp;p); for (ibeat=0;ibeat&lt;beats;ibeat++) { for (i=0; i&lt;Cols/2; i++) { for (y=0; y&lt;Rows/2; y++) { if (my_rank == 0) if (i &lt; 48) if (y&lt;48) V[i][y] = 0; .... ....... ..... } } //Load the Array with the edge values for (r=0; r&lt;Rows/2; y++) { if ((my_rank == 0) || (my_rank == 1)) { A[r] = V[r][48]; BB[r] = V[r][48]; } ..... ..... } int test = 2; if ((my_rank%test) == 0) { MPI_Isend(C, Rows, MPI_DOUBLE, my_rank+1, 0, MPI_COMM_WORLD, &amp;send_request); MPI_Irecv(CC, Rows, MPI_DOUBLE, my_rank+1, MPI_ANY_TAG, MPI_COMM_WORLD, &amp;recv_request); } else if ((my_rank%test) == 1) ...... ...... ibeat = ibeat+1; prttofile (); } //close ibeat MPI_Finalize (); } //close main //Print to File Function to save output values void prttofile () { for (i = 0; i&lt;Cols/2; i++) { for (y = 0; y&lt;Rows/2; y++) { if (my_rank == 0) fout &lt;&lt; V[i][y] &lt;&lt; " " ; .... ..... } } if (my_rank == 0) fout &lt;&lt; endl; if .... .... } </code></pre>
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