parfor and rng(1)

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mingcheng nie
mingcheng nie 2022-8-19
评论： mingcheng nie 2022-8-24
Hi there,
I was doing matlab simulation based on different SNR and rng, and want to use parfor to speed up, can we do like this?(can we use rng together with parfor?)
rng(1)
count=10000;
for SNR=20:5:50
for i = 1: count
chan_coef = randn(1,1)+1i*randn(1,1);
...
end
end
%Is It Correct to Change to
rng(1)
count=10000;
parfor SNR=20:5:50
parfor i = 1: count
chan_coef = randn(1,1)+1i*randn(1,1);
...
end
end
Thanks,
Charlie

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Bruno Luong
Bruno Luong 2022-8-19
编辑：Bruno Luong 2022-8-19
rdn(1) outside the parfor has no effect.
from the doc:
"For independent streams on the workers, use the default behavior or consider using a unique substream on each worker using RandStream."
So you should leave the parfor loop alone or use RandSteam inside parfor loop (but not rdn('shuffle') as warned the doc).

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