PBLAS -- Auxiliary Subprograms

• Using the BLACS topologies for efficiency and scalability:

SUBROUTINE PTOPSET(ICTXT, OP, SCOPE, TOP)

SUBROUTINE PTOPGET(ICTXT, OP, SCOPE, TOP)

INTEGER ICTXT

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.

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