next up previous contents index
Next: In-core Dense Matrices Up: Data Distributions and Software Previous: Scoped Operations

Array Descriptors


An array descriptor    is associated with each global array. This array stores the information required to establish the mapping between each global array entry and its corresponding process and memory location. The notations x_ used in the entries of the array descriptor denote the attributes of a global array. For example, M_ denotes the number of rows and M_A specifically denotes the number of rows in global matrix A. These descriptors assume different storage for the global data. The length of the array descriptor  is specified by DLEN_ and varies according to the descriptor type DTYPE_.

Array descriptors are provided for

and are differentiated by the DTYPE_ entry in the descriptor. At the present time the following values of DESC_(DTYPE_) are valid.  

Table 4.2: Valid values of DESC_(DTYPE_)

Susan Blackford
Tue May 13 09:21:01 EDT 1997