MATLAB PARALLEL COMPUTING TOOLBOX - S Uživatelská příručka stáhnout pdf (Strana 503)

100

101

labSendReceive

11-159

dataReceived = labSendReceive(rcvWkrIdx,srcWkrIdx,dataSent,tag) uses

the specified tag for the communication. tag can be any integer from 0 to 32767.

Examples

Create a unique set of data on each worker, and transfer each worker’s data one worker

to the right (to the next higher labindex).

First use the magic function to create a unique value for the variant array mydata on

each worker.

mydata = magic(labindex)

Lab 1:

mydata =

Lab 2:

mydata =

1 3

4 2

Lab 3:

mydata =

8 1 6

3 5 7

4 9 2

Define the worker on either side, so that each worker will receive data from the worker

on its “left,” while sending data to the worker on its “right,” cycling data from the end

worker back to the beginning worker.

rcvWkrIdx = mod(labindex, numlabs) + 1; % one worker to the right

srcWkrIdx = mod(labindex - 2, numlabs) + 1; % one worker to the left

Transfer the data, sending each worker’s mydata into the next worker’s otherdata

variable, wrapping the third worker’s data back to the first worker.

otherdata = labSendReceive(rcvWkrIdx,srcWkrIdx,mydata)

Lab 1:

otherdata =

8 1 6

3 5 7

4 9 2

1 2 ... 498 499 500 501 502 503 504 505 506 507 508 ... 655 656

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