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HPL_spreadT(3) |
HPL Library Functions |
HPL_spreadT(3) |
HPL_spreadT - Spread row panel U and forward current column panel.
#include "hpl.h"
void HPL_spreadT( HPL_T_panel * PBCST,
int * IFLAG, HPL_T_panel * PANEL, const enum
HPL_SIDE SIDE, const int N, double *
U, const int LDU, const int SRCDIST,
const int * IPLEN, const int * IPMAP, const
int * IPMAPM1 );
HPL_spreadT spreads the local array containing local pieces of U, so that
on exit to this function, a piece of U is contained in every process row. The
array IPLEN contains the number of columns of U, that should be spread on any
given process row. This function also probes for the presence of the column
panel PBCST. If available, this panel will be forwarded. If PBCST is NULL on
input, this probing mechanism will be disabled.
- PBCST (local input/output) HPL_T_panel *
- On entry, PBCST points to the data structure containing the panel (to be
broadcast) information.
- IFLAG (local input/output) int *
- On entry, IFLAG indicates whether or not the broadcast has already been
completed. If not, probing will occur, and the outcome will be contained
in IFLAG on exit.
- PANEL (local input/output) HPL_T_panel *
- On entry, PANEL points to the data structure containing the panel (to be
spread) information.
- SIDE (global input) const enum HPL_SIDE
- On entry, SIDE specifies whether the local piece of U located in process
IPMAP[SRCDIST] should be spread to the right or to the left. This feature
is used by the equilibration process.
- N (global input) const int
- On entry, N specifies the local number of rows of U. N must be at least
zero.
- U (local input/output) double *
- On entry, U is an array of dimension (LDU,*) containing the local pieces
of U.
- LDU (local input) const int
- On entry, LDU specifies the local leading dimension of U. LDU should be at
least MAX(1,N).
- SRCDIST (local input) const int
- On entry, SRCDIST specifies the source process that spreads its piece of
U.
- IPLEN (global input) const int *
- On entry, IPLEN is an array of dimension NPROW+1. This array is such that
IPLEN[i+1] - IPLEN[i] is the number of rows of U in each process before
process IPMAP[i], 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 U that should be moved to process IPMAP[i].
- IPMAP (global input) const int *
- On entry, IPMAP is an array of dimension NPROW. This array contains the
logarithmic mapping of the processes. In other words, IPMAP[myrow] is the
absolute coordinate of the sorted process.
- IPMAPM1 (global input) const int *
- On entry, IPMAPM1 is an array of dimension NPROW. This array contains the
inverse of the logarithmic mapping contained in IPMAP: For i in [0..
NPROW) IPMAPM1[IPMAP[i]] = i.
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