This set of controls is used to provide default values in this package.
Objects contain several parameters for communicators and methods.
The default blocking dmat_opts$BLDIM is c(16,16), which results in a 16 by
16 blocking dimension for distributed matrices. Any time a function takes
the bldim= argument, it will default to this value unless the user
specifies an alternative.
The default ICTXT is 0. This is the full 2-dimensional processor grid.