HPL_numroc - Man Page

Compute the local number of row/columns.


#include "hpl.h"
 int HPL_numroc( const int N, const int INB, const int NB, const int PROC, const int SRCPROC, const int NPROCS );


HPL_numroc returns  the  local number of matrix rows/columns process PROC  will  get  if  we give out  N rows/columns starting from global index 0.


N       (input)                 const int

On entry, N  specifies the number of rows/columns being dealt out. N 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 A. NB must be larger than one.

PROC    (input)                 const int

On entry, PROC specifies  the coordinate of the process whose local portion is determined.  PROC must be at least zero  and strictly less than NPROCS.

SRCPROC (input)                 const int

On entry,  SRCPROC  specifies  the coordinate of the  process that possesses the first row or column of the matrix. SRCPROC must be at least zero and strictly less than NPROCS.

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_indxg2l (3), HPL_indxg2lp (3), HPL_indxg2p (3), HPL_indxl2g (3), HPL_numrocI (3).

Referenced By

HPL_indxg2l(3), HPL_indxg2lp(3), HPL_indxg2p(3), HPL_indxl2g(3), HPL_infog2l(3), HPL_numrocI(3).

February 24, 2016 HPL 2.2 HPL Library Functions