Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

p?lared1d

Redistributes an array assuming that the input array,
bycol
, is distributed across rows and that all process columns contain the same copy of
bycol
.

Syntax

void
pslared1d
(
MKL_INT
*n
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desc
,
float
*bycol
,
float
*byall
,
float
*work
,
MKL_INT
*lwork
);
void
pdlared1d
(
MKL_INT
*n
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desc
,
double
*bycol
,
double
*byall
,
double
*work
,
MKL_INT
*lwork
);
Include Files
  • mkl_scalapack.h
Description
The
p?lared1d
function
redistributes a 1D array. It assumes that the input array
bycol
 is distributed across rows and that all process column contain the same copy of
bycol
. The output array
byall
 is identical on all processes and contains the entire array.
Input Parameters
np
 = Number of local rows in
bycol
()
n
(global)
The number of elements to be redistributed.
n
≥
 0
.
ia
,
ja
(global)
ia
,
ja
 must be equal to 1.
desc
(local) array of size 9. A 2D array descriptor, which describes
bycol
.
bycol
(local).
Distributed block cyclic array of global size
n
 and of local size
np
.
bycol
 is distributed across the process rows. All process columns are assumed to contain the same value.
work
(local).
size
lwork
. Used to hold the buffers sent from one process to another.
lwork
(local)
The size of the
work
 array.
lwork
≥
numroc
(
n
,
desc
[
nb_
]
, 0, 0,
npcol
)
.
Output Parameters
byall
(global).
Global size
n
, local size
n
.
byall
 is exactly duplicated on all processes. It contains the same values as
bycol
, but it is replicated across all processes rather than being distributed.

Product and Performance Information

1

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