Developer Reference

Contents

p?lacp3

Copies from a global parallel array into a local replicated array or vice versa.

Syntax

void
pslacp3
(
const
MKL_INT
*
m
,
const
MKL_INT
*
i
,
float
*
a
,
const
MKL_INT
*
desca
,
float
*
b
,
const
MKL_INT
*
ldb
,
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
rev
);
void
pdlacp3
(
const
MKL_INT
*
m
,
const
MKL_INT
*
i
,
double
*
a
,
const
MKL_INT
*
desca
,
double
*
b
,
const
MKL_INT
*
ldb
,
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
rev
);
void pclacp3
(
const
MKL_INT
*
m
,
const
MKL_INT
*
i
,
MKL_Complex8
*
a
,
const
MKL_INT
*
desca
,
MKL_Complex8
*
b
,
const
MKL_INT
*
ldb
,
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
rev
);
void pzlacp3
(
const
MKL_INT
*
m
,
const
MKL_INT
*
i
,
MKL_Complex16
*
a
,
const
MKL_INT
*
desca
,
MKL_Complex16
*
b
,
const
MKL_INT
*
ldb
,
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
rev
);
Include Files
  • mkl_scalapack.h
Description
This is an auxiliary
function
that copies from a global parallel array into a local replicated array or vise versa. Note that the entire submatrix that is copied gets placed on one node or more. The receiving node can be specified precisely, or all nodes can receive, or just one row or column of nodes.
Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.
Notice revision #20201201
Input Parameters
m
(global)
m
is the order of the square submatrix that is copied.
m
0. Unchanged on exit.
i
(global)
The matrix element
A
(
i
,
i
) is the global location that the copying starts from. Unchanged on exit.
a
(local)
Array of size
lld_a
*
LOCc
(
n_a
)
. On entry, the parallel matrix to be copied into or from.
desca
(global and local) array of size
dlen_
. The array descriptor for the distributed matrix
A
.
b
(local)
Array of size
ldb
*
LOCc
(
m
)
. If
rev
= 0
, this is the global portion of the matrix
A
(
i
:
i
+
m
-1,
i
:
i
+
m
-1). If
rev
= 1
, this is unchanged on exit.
ldb
(local)
The leading dimension of
B
.
ii
,
jj
(global) By using
rev
0 and 1, data can be sent out and returned again. If
rev
= 0
, then
ii
is destination row index and
jj
is destination column index for the node(s) receiving the replicated
matrix
B
. If
ii
0,
jj
0, then node (
ii
,
jj
) receives the data. If
ii
= -1,
jj
0, then all rows in column
jj
receive the data. If
ii
0,
jj
= -1, then all cols in row
ii
receive the data. If
ii
= -1,
jj
= -1, then all nodes receive the data. If
rev
!=0, then
ii
is the source row index for the node(s) sending the replicated
B
.
rev
(global) Use
rev
= 0
to send global
matrix
A
into locally replicated
matrix
B
(on node (
ii
,
jj
)). Use
rev
!= 0 to send locally replicated
B
from node (
ii
,
jj
) to its owner (which changes depending on its location in
A
) into the global
A
.
Output Parameters
a
On exit, if
rev
= 1
, the copied data. Unchanged on exit if
rev
= 0
.
b
If
rev
= 1
, this is unchanged on exit.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.