Safety of generating random numbers

[chengxo]

Hi,

Is it safe to start a random number generator and using @turbo to vectorize the process of filling an array? like

using LoopVectorization, Random
rng = MersenneTwister(0)
a = zeros(100)
@turbo for i in eachindex(a)
a[i] = randn(rng)
end

I wonder whether it will cause redundance of entries. I can test on my computer, but I would like to know whether the behavior is guaranteed to be correct from its principle.
Thanks very much!

[chriselrod]

It will cause redundancy of entries/will not be valid.
If you'd like a faster random number generator, you can try https://github.com/JuliaSIMD/VectorizedRNG.jl
I never optimized it for generating single numbers at a time, but randn! or rand! methods for filling arrays should be fast. It can also fuse multiplying and adding numbers for different ranges, e.g. randn!(local_rng(), dst, static(0), mu, sigma) should sample from a Normal(mu, sigma).

[chengxo]

Thank you very much!