?gsum2d
?gsum2d
Performs element-wise summation.
Syntax
call igsum2d
(
icontxt
,
scope
,
top
,
m
,
n
,
a
,
lda
,
rdest
,
cdest
)
call sgsum2d
(
icontxt
,
scope
,
top
,
m
,
n
,
a
,
lda
,
rdest
,
cdest
)
call dgsum2d
(
icontxt
,
scope
,
top
,
m
,
n
,
a
,
lda
,
rdest
,
cdest
)
call cgsum2d
(
icontxt
,
scope
,
top
,
m
,
n
,
a
,
lda
,
rdest
,
cdest
)
call zgsum2d
(
icontxt
,
scope
,
top
,
m
,
n
,
a
,
lda
,
rdest
,
cdest
)
Input Parameters
- icontxt
- INTEGER. Integer handle that indicates the context.
- scope
- CHARACTER*1. Indicates what scope the combine should proceed on. Limited toROW,COLUMN, orALL.
- top
- CHARACTER*1. Communication pattern to use during the combine operation.
- m
- INTEGER. The number of matrix rows to be combined.
- n
- INTEGER. The number of matrix columns to be combined.
- a
- TYPEarray(. Matrix to be added to produce the sum.lda,n)
- lda
- INTEGER. The leading dimension of the matrixA, that is, the distance between two successive elements in a matrix row.
- rdest
- INTEGER.The process row coordinate of the process that should receive the result. Ifrdestorcdest= -1, all processes within the indicated scope receive the answer.
- cdest
- INTEGER.The process column coordinate of the process that should receive the result. Ifrdestorcdest= -1, all processes within the indicated scope receive the answer.
Output
Parameters
- a
- TYPEarray(. Contains the result if this process is selected to receive the answer, or intermediate results if the process is not selected to receive the result.lda,n)
Description
This routine performs element-wise
summation, that is, each element of matrix
A
is summed
with the corresponding element of the other process's matrices.
Combines may be globally-blocking, so they must be programmed as if
no process returns until all have called the routine.