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function F(N)
    A = fill(1, N)
    B = fill(1, N)
    r = []
    dt1 = @elapsed (for w in workers(); copy!(B, A); B[1]; end)
    dt2 = @elapsed begin
        for w in workers()
            push!(r, remotecall(w, () -> A[1]))
        end
        @show map(fetch, r)
    end
    M = N/(1024*1024)
    W = length(workers())
    @printf("%.2f / %.2f MB/s\n", W*(M/dt1), W*(M/dt2))
end