Hello. After executing MPI_Send() for the first time in the root process, my program blocks. int the root process, I have: ... while(i++<iWorldSize) { cout << "executing send for the " << i-1 << "th time" << endl; MPI_Send(&A[i-1], n*m/iWorldSize, MPI_INT, j, itag, MPI_COMM_WORLD); cout << "executed send for the " << i << "th time" << endl; }//end while ... and in the slave processes I have ... MPI_Status status; int *buffer = new int[m*(n/iWorldSize)]; cout << "\n\n\n**********Executing receive*******" << endl; MPI_Recv(&buffer, m*(n/iWorld ... where did I go wrong? Thank you