Nested dissection by METIS/ParMETISThese methods produce orderings that reduce fill in sparse matrix factorizations (Cholesky). Ordering is accessed through calls to Zoltan_Order.
Nested dissection by Scotch/PT-Scotch
Parameters: | |
ORDER_METHOD | The order algorithm used by Zoltan is specified by this parameter.
Valid values are
"NODEND" (for nodal nested dissection by ParMETIS or METIS), |
ORDER_TYPE | "LOCAL" or "GLOBAL". If LOCAL is selected, then each processor constructs a local (sub-)graph. All inter-processor edges are simply ignored. The ordering arrays returned, rank and iperm, are local permutation vectors in this case. If LOCAL is selected, the serial version of the ordering routine is used, i.e. Metis for ParMetis or Scotch for PT-Scotch. |
ORDER_START_INDEX | The start index for the permutation vectors rank and iperm. Valid values are 0 and 1. |
REORDER | If this value is set to TRUE (non-zero), Zoltan assumes that the lists of local and global ids are given as input to Zoltan_Order. Otherwise, the id lists will be populated by Zoltan_Order. The permutation of the ids will be the one produced by calling the query functions. |
Default Values: | |
ORDER_METHOD = NODEND | |
ORDER_TYPE = GLOBAL | |
ORDER_START_INDEX = 0 | |
REORDER = FALSE |