HPL_indxg2l man page

HPL_indxg2l — Map a global index into a local one.

Synopsis

#include "hpl.h"
 int HPL_indxg2l( const int IG, const int INB, const int NB, const int SRCPROC, const int NPROCS );

Description

HPL_indxg2l computes  the local index of a matrix entry pointed to by the  global index IG.  This  local  returned index is the same in all processes.

Arguments

IG      (input)                 const int

On entry, IG specifies the global index of the matrix  entry. IG must be at least zero.

INB     (input)                 const int

On entry,  INB  specifies  the size of the first block of the global matrix. INB must be at least one.

NB      (input)                 const int

On entry,  NB specifies the blocking factor used to partition and distribute the matrix. NB must be larger than one.

SRCPROC (input)                 const int

On entry, if SRCPROC = -1, the data  is not  distributed  but replicated,  in  which  case  this  routine returns IG in all processes. Otherwise, the value of SRCPROC is ignored.

NPROCS  (input)                 const int

On entry,  NPROCS  specifies the total number of process rows or columns over which the matrix is distributed.  NPROCS must be at least one.

See Also

HPL_indxg2lp (3), HPL_indxg2p (3), HPL_indxl2g (3), HPL_numroc (3), HPL_numrocI (3).

Info

October 26, 2012 HPL 2.1 HPL Library Functions