SPMD to process different iteration on different worker

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I'm trying to use the spmd to process different iteration. The current problem I have is the spmd function is repeating the same processing on different worker. I have tried to use parfor but the parfor cannot guarantee the iteration is process in order. What I am looking for is to have the iteration process in order. For example, from 0>1>2>3>4,.... Below is the sample code.
clear
clc
iCellNum = 1;
activeUeNums = 1;
tic
ticBytes(gcp)
for ttiNum = 1 : 20
spmd
if true
fprintf('%s processing subframe: %d\n', getTimeNow, ttiNum-1);
end
end
end
toc
tocBytes(gcp)

Answers (1)

Edric Ellis
Edric Ellis on 2 Aug 2022
It's not entirely clear to me quite what you're after. You might want for (drange) which spreads the iterations of a for loop over different workers in spmd.
parpool("local");
Starting parallel pool (parpool) using the 'local' profile ... Connected to the parallel pool (number of workers: 2).
spmd
for ii = drange(1:20)
fprintf('Worker %d processing iteration %d\n', labindex, ii);
end
end
Worker 1: Worker 1 processing iteration 1 Worker 1 processing iteration 2 Worker 1 processing iteration 3 Worker 1 processing iteration 4 Worker 1 processing iteration 5 Worker 1 processing iteration 6 Worker 1 processing iteration 7 Worker 1 processing iteration 8 Worker 1 processing iteration 9 Worker 1 processing iteration 10 Worker 2: Worker 2 processing iteration 11 Worker 2 processing iteration 12 Worker 2 processing iteration 13 Worker 2 processing iteration 14 Worker 2 processing iteration 15 Worker 2 processing iteration 16 Worker 2 processing iteration 17 Worker 2 processing iteration 18 Worker 2 processing iteration 19 Worker 2 processing iteration 20
  4 Comments
Walter Roberson
Walter Roberson on 3 Aug 2022
Do you need spmd specifically? That is, are you doing labSend(), or using labBarrier to control access to a resource?
If not then consider queuing a bunch of jobs using parfeval.

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