

 
Manual Reference Pages  HPL_PLINDX10 (3)
NAME
HPL_plindx10  Compute the logarithmic maps for the spreading.
CONTENTS
Synopsis
Description
Arguments
See Also
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  HPL_PLINDX10 (3)  October 26, 2012 
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