Visible to Intel only — GUID: GUID-B9D26327-928F-4088-B5AF-110BA928912F
Visible to Intel only — GUID: GUID-B9D26327-928F-4088-B5AF-110BA928912F
?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 to ROW, COLUMN, or ALL. |
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 |
TYPE array (lda, n). Matrix to be added to produce the sum. |
lda |
INTEGER. The leading dimension of the matrix A, 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. If rdest or cdest = -1, all processes within the indicated scope receive the answer. |
cdest |
INTEGER. The process column coordinate of the process that should receive the result. If rdest or cdest = -1, all processes within the indicated scope receive the answer. |
Output Parameters
a |
TYPE array (lda, n). 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. |
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.