HPL_numrocI HPL 2.2 Library Functions February 24, 2016


HPL_numrocI Compute the local number of row/columns.


#include "hpl.h"

int HPL_numrocI( const int N, const int I, const int INB, const int NB, const int PROC, const int SRCPROC, const int NPROCS );


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


N       (input)                       const int
        On entry, N  specifies the number of rows/columns being dealt
        out. N must be at least zero.
I       (input)                       const int
        On entry, I  specifies the global index of the matrix  entry
        I must be at least zero.
INB     (input)                       const int
        On entry,  INB  specifies  the size of the first block of th
        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 whos
        local portion is determined.  PROC must be at least zero  an
        strictly less than NPROCS.
SRCPROC (input)                       const int
        On entry,  SRCPROC  specifies  the coordinate of the  proces
        that possesses the first row or column of the matrix. SRCPRO
        must be at least zero and strictly less than NPROCS.
NPROCS  (input)                       const int
        On entry,  NPROCS  specifies the total number of process row
        or columns over which the matrix is distributed.  NPROCS mus
        be at least one.

See Also

HPL_indxg2l, HPL_indxg2lp, HPL_indxg2p, HPL_indxl2g, HPL_numroc.