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NAG Parallel Library

Z01 - Library Utilities


Chapter Introduction
Z01AAFP Defines a 2-d logical processor grid (Library Grid) and returns the BLACS context
Z01ABFP Undefines the logical processor grid and invalidates the BLACS context initialised by Z01AAFP
Z01ACFP Root processor identifier
Z01ADFP Used in creating processes outside the default library mechanism, allows multigridding, used in more advanced applications (PVM-based version only)
Z01AEFP Used in creating processes outside the default library mechanism, allows multigridding, used in more advanced applications (MPI-based version only)
Z01BAFP Row and column indices of the root processor within the logical grid
Z01BBFP Identifies logical processors in context in the 2-d grid declared by Z01AAFP
Z01BDFP Information about PVM tasks (PVM-based version only)
Z01BEFP Topology to be used by BLACS for broadcasting and global operations
Z01BFFP Enables debugging (PVM-based version only)
Z01BGFP Information about MPI tasks (MPI-based version only)
Z01CAFP Number of rows or columns of a matrix held locally on a given processor when the matrix is distributed in the cyclic 2-d block fashion (NUMROC)
Z01CBFP Length of the workspace for F08AEFP and F08AFFP
Z01CCFP Length of the workspace for F08AGFP
Z01CDFP Process coordinate which possesses the entry of a distributed matrix specified by a global index (INDXG2P)
Z01CEFP Length of the workspace for F08FEFP (PDSYTRD)


© The Numerical Algorithms Group Ltd, Oxford UK. 1999