HPL_numroc HPL 2.2 Library Functions February 24, 2016

Name

HPL_numroc Compute the local number of row/columns.

Synopsis

#include "hpl.h"

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

Description

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.

Arguments

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, HPL_indxg2lp, HPL_indxg2p, HPL_indxl2g, HPL_numrocI.