Description

S3L_describe prints information about a parallel array or a process grid to standard output. If an array handle is supplied in argument A, the parallel array is described. If a process grid is supplied in A, the associated process grid is described. The info_node argument specifies the MPI rank of the process on which the subgrid of interest is located.

If A is an S3L array handle, the following is provided:

• Information on the rank extents and the data type of the array, as well as the starting address in memory of its subgrid.

Note: If the entire array fits on the process specified by info_node, all parts of the S3L_describe output apply to the full array. Otherwise, some parts of the output, such as subgrid size, will apply only to the portion of the array that is on process info_node.

• A description of the underlying grid of processes to which data is mapped.

If A is a process grid handle, S3L_describe provides only a description of the underlying grid of processes to which data is mapped.

To determine what value to enter for info_node, run MPI_Comm_rank on the process of interest.