On Fri, Feb 17, 2012 at 1:46 PM, Blaise Bourdin <[email protected]> wrote:
Hi,
Is there an easy way to gather all values of an IS across all processes in a communicator while removing duplicates?
Basically, I want to go from [0] Number of indices in set 2 [0] 0 1 [0] 1 2 [1] Number of indices in set 2 [1] 0 2 [1] 1 3
to [0] Number of indices in set 3 [0] 0 1 [0] 1 2 [0] 2 3 [1] Number of indices in set 3 [1] 0 1 [1] 1 2 [1] 2 3
The way I do it right now is ierr = ISGetTotalIndices(csIS,&labels);CHKERRQ(ierr); ierr = ISGetSize(csIS,&num_cs_global);CHKERRQ(ierr);
I would violate PETSc semantics here since you are going to destroy csIS anyway: PetscSortRemoveDupsInt(&num_cs_global, labels); ISCreateGeneral(comm, num_cs_global, labels, PETSC_COPY_VALUES, &csIS_global);
ierr = ISRestoreTotalIndices(csIS,&labels);CHKERRQ(ierr);
Matt
Blaise -- Department of Mathematics and Center for Computation & Technology Louisiana State University, Baton Rouge, LA 70803, USA Tel. +1 (225) 578 1612, Fax +1 (225) 578 4276 http://www.math.lsu.edu/~bourdin
-- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener