added broadcast

broadcast.sh

+mpic++ -o bcast.exe -x c++ - << EOF
+#include <mpi.h>
+int main(int argc, char **argv)
+{
+  MPI_Init(NULL,NULL);
+  int rank;
+  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+  MPI_Bcast(&rank,1, MPI_INT, 0, MPI_COMM_WORLD);
+  MPI_Finalize();
+  return rank;
+}
+EOF
+srun -n 2 -- $PWD/bcast.exe