[petsc-users] Gathering distributed dense matrix only on rank 0

Hei, is there a way to gather a distributed dense matrix only on rank 0, not on the other ranks? My matrix processing/storage routines in my program currently are single-threaded and only operate on rank 0, and therefore I assume that I can ignore all other ranks. This should also save a bit time, I hope (MatCreateRedundantMatrix is currently the by far most expensive part of my program). When executing MatCreateRedundantMatrix(A, size, MPI_COMM_NULL, MAT_INITIAL_MATRIX, &B), usually all ranks get the full matrices, something I would like to avoid. Therefore, is there another way of handling this? Thanks! Regards, Roland Richter