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.TH HPL_plindx10 3 "September 10, 2008" "HPL 2.0" "HPL Library Functions"
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.SH NAME
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HPL_plindx10 \- Compute the logarithmic maps for the spreading.
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.SH SYNOPSIS
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\fB\&#include "hpl.h"\fR
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\fB\&void\fR
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\fB\&HPL_plindx10(\fR
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\fB\&HPL_T_panel *\fR
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\fI\&PANEL\fR,
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\fB\&const int\fR
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\fI\&K\fR,
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\fB\&const int *\fR
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\fI\&IPID\fR,
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\fB\&int *\fR
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\fI\&IPLEN\fR,
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\fB\&int *\fR
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\fI\&IPMAP\fR,
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\fB\&int *\fR
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\fI\&IPMAPM1\fR
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\fB\&);\fR
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.SH DESCRIPTION
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\fB\&HPL_plindx10\fR
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computes  three arrays  IPLEN,  IPMAP  and  IPMAPM1  that
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contain the logarithmic mapping information for the spreading phase.
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.SH ARGUMENTS
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.TP 8
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PANEL   (local input/output)    HPL_T_panel *
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On entry,  PANEL  points to the data structure containing the
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panel information.
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.TP 8
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K       (global input)          const int
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On entry, K specifies the number of entries in IPID.  K is at
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least 2*N, and at most 4*N.
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.TP 8
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IPID    (global input)          const int *
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On entry,  IPID  is an array of length K. The first K entries
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of that array contain the src and final destination resulting
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from the application of the interchanges.
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.TP 8
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IPLEN   (global output)         int *
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On entry, IPLEN  is an array of dimension NPROW + 1. On exit,
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this array is such that  IPLEN[i]  is the number of rows of A
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in the processes  before process IMAP[i] after the sort, with
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the convention that IPLEN[nprow] is the total number of rows.
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In other words,  IPLEN[i+1] - IPLEN[i] is the local number of
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rows of  A  that should be moved for each process.  IPLEN  is
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such that the number of rows of the source process row can be
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computed as IPLEN[1] - IPLEN[0], and the remaining entries of
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this  array are sorted  so  that  the quantities IPLEN[i+1] -
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IPLEN[i] are logarithmically sorted.
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.TP 8
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IPMAP   (global output)         int *
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On entry, IPMAP is an array of dimension NPROW. On exit, this
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array contains  the logarithmic mapping of the processes.  In
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other words, IPMAP[myrow] is the corresponding sorted process
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coordinate.
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.TP 8
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IPMAPM1 (global output)         int *
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On entry, IPMAPM1  is an array of dimension NPROW.  On  exit,
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this  array  contains  the inverse of the logarithmic mapping
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contained  in  IPMAP:  IPMAPM1[ IPMAP[i] ] = i,  for all i in
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[0.. NPROW)
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.SH SEE ALSO
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.BR HPL_pdlaswp00N \ (3),
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.BR HPL_pdlaswp00T \ (3),
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.BR HPL_pdlaswp01N \ (3),
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.BR HPL_pdlaswp01T \ (3).