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[Scalapack] communicator returned by Cblacs2sys_handle


When a BlacsGrid is created via a call to blacs_gridmap, it looks like at least 
three communicators are created:

1. MPI communicator for scope = 'all'
2. MPI communicator for scope = 'row'
3. MPI communicator for scope = 'Column'

From the look of the BLACSCONTEXT structure in Bdef.h, there is also possibly
a pt2pt scope?

My main question:

Which communicator is returned by Cblacs2sys_handle?

Nichols A. Romero, Ph.D.
Argonne Leadership Computing Facility
Argonne National Laboratory
Building 240 Room 2-127
9700 South Cass Avenue
Argonne, IL 60490
(630) 252-3441

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