PBLAS -- Auxiliary Subprograms
Using the BLACS topologies for efficiency and scalability:
SUBROUTINE PTOPSET(ICTXT, OP, SCOPE, TOP)
SUBROUTINE PTOPGET(ICTXT, OP, SCOPE, TOP)
CHARACTER*1 OP,SCOPE, TOP
PTOPSET assigns the BLACS topology TOP to be used in the communication operations OP along the scope specified by SCOPE. PTOPGET retrieves the topology.
These routines should be called by every process in the grid identified by the BLACS context ICTXT.