PBLAS -- Storage Conventions
Descriptor DESC_: 9-Integer array describing the matrix layout, containing DTYPE_, CTXT_, M_, N_, MB_, NB_, RSRC_, CSRC_, LLD_, where (RSRC_,CSRC_) are the coordinates of the process owning the first matrix entry in the grid specified by CTXT_.
Ex: M_=N_5, MB_=NB_=2, RSRC_=CSRC_=0, LLD_ >= 3 (in process row 0), and 2 (in process row 1).