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HPL_plindx10(3)              HPL Library Functions             HPL_plindx10(3)


NAME

       HPL_plindx10 - Compute the logarithmic maps for the spreading.


SYNOPSIS

       #include "hpl.h"

       void HPL_plindx10( HPL_T_panel * PANEL, const int K, const int * IPID,
       int * IPLEN, int * IPMAP, int * IPMAPM1 );


DESCRIPTION

       HPL_plindx10 computes  three arrays  IPLEN,  IPMAP  and  IPMAPM1  that
       contain the logarithmic mapping information for the spreading phase.


ARGUMENTS

       PANEL   (local input/output)    HPL_T_panel *
               On entry,  PANEL  points to the data structure containing the
               panel information.

       K       (global input)          const int
               On entry, K specifies the number of entries in IPID.  K is at
               least 2*N, and at most 4*N.

       IPID    (global input)          const int *
               On entry,  IPID  is an array of length K. The first K entries
               of that array contain the src and final destination resulting
               from the application of the interchanges.

       IPLEN   (global output)         int *
               On entry, IPLEN  is an array of dimension NPROW + 1. On exit,
               this array is such that  IPLEN[i]  is the number of rows of A
               in the processes  before process IMAP[i] after the sort, with
               the convention that IPLEN[nprow] is the total number of rows.
               In other words,  IPLEN[i+1] - IPLEN[i] is the local number of
               rows of  A  that should be moved for each process.  IPLEN  is
               such that the number of rows of the source process row can be
               computed as IPLEN[1] - IPLEN[0], and the remaining entries of
               this  array are sorted  so  that  the quantities IPLEN[i+1] -
               IPLEN[i] are logarithmically sorted.

       IPMAP   (global output)         int *
               On entry, IPMAP is an array of dimension NPROW. On exit, this
               array contains  the logarithmic mapping of the processes.  In
               other words, IPMAP[myrow] is the corresponding sorted process
               coordinate.

       IPMAPM1 (global output)         int *
               On entry, IPMAPM1  is an array of dimension NPROW.  On  exit,
               this  array  contains  the inverse of the logarithmic mapping
               contained  in  IPMAP:  IPMAPM1[ IPMAP[i] ] = i,  for all i in
               [0.. NPROW)


SEE ALSO

       HPL_pdlaswp00N (3), HPL_pdlaswp00T (3), HPL_pdlaswp01N (3),
       HPL_pdlaswp01T (3).

HPL 2.1                        October 26, 2012                HPL_plindx10(3)

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