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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 con-
     tain 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 conven-
	     tion 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 loga-
	     rithmically 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_pd-
     laswp01T (3).

HPL 2.3 			December 2, 2018		 HPL_plindx10(3)

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