MATLAB PARALLEL COMPUTING TOOLBOX - S Betriebsanweisung PDF herunterladen (Seite 84)

100

101

3 Single Program Multiple Data (spmd)

3-6

Access Worker Variables with Composites

In this section...

“Introduction to Composites” on page 3-6

“Create Composites in spmd Statements” on page 3-6

“Variable Persistence and Sequences of spmd” on page 3-8

“Create Composites Outside spmd Statements” on page 3-9

Introduction to Composites

Composite objects in the MATLAB client session let you directly access data values

on the workers. Most often you assigned these variables within spmd statements. In

their display and usage, Composites resemble cell arrays. There are two ways to create

Composites:

• Use the Composite function on the client. Values assigned to the Composite elements

are stored on the workers.

• Define variables on workers inside an spmd statement. After the spmd statement, the

stored values are accessible on the client as Composites.

Create Composites in spmd Statements

When you define or assign values to variables inside an spmd statement, the data values

are stored on the workers.

After the spmd statement, those data values are accessible on the client as Composites.

Composite objects resemble cell arrays, and behave similarly. On the client, a Composite

has one element per worker. For example, suppose you create a parallel pool of three

local workers and run an spmd statement on that pool:

parpool('local',3)

spmd % Uses all 3 workers

MM = magic(labindex+2); % MM is a variable on each worker

end

MM{1} % In the client, MM is a Composite with one element per worker

8 1 6

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 655 656

Kommentare zu diesen Handbüchern

Keine Kommentare

MATLAB PARALLEL COMPUTING TOOLBOX - S Betriebsanweisung Seite 84

Kommentare zu diesen Handbüchern

Solac Elektrické varné konvice uživatelské příručky

MATLAB PARALLEL COMPUTING TOOLBOX - S Betriebsanweisung Seite 84

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Software MATLAB PARALLEL COMPUTING TOOLBOX - S

Solac Elektrické varné konvice uživatelské příručky