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HPL_plindx10(3) HPL Library Functions HPL_plindx10(3)

HPL_plindx10 - Compute the logarithmic maps for the spreading.

#include "hpl.h"
void HPL_plindx10( HPL_T_panel * PANEL, const int K, const int * IPID, int * IPLEN, int * IPMAP, int * IPMAPM1 );

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

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)

HPL_pdlaswp00N (3), HPL_pdlaswp00T (3), HPL_pdlaswp01N (3), HPL_pdlaswp01T (3).
February 24, 2016 HPL 2.2

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