Poor performance on cluster multithreading

General Usage Performance
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16

You can solve the problem like this:

using Compat, Compat.Random

const twisters = [MersenneTwister() for i ∈ 1:Threads.nthreads()];

#Multithreaded.
function tf!(x::Vector{Matrix{Float64}},N::Int64)
    Threads.@threads for ii=1:N
        id = Threads.threadid()
        twister = twisters[id]
        @inbounds x_thd = x[id]
        for nn=1:100
            for mm=1:100
                @inbounds x_thd[mm,nn] += randn(twister)
            end
        end
    end
    return nothing
end
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