FLoops @init allocate only once

General Usage Performance
4

You need to specify the number of elements while creating the Channel; otherwise, it assumes zero elements by default.

julia> buff = Channel(Threads.nthreads())
Channel{Any}(1) (empty)

julia> for _ in 1:Threads.nthreads()
                  put!(buff,zeros(3))
              end

julia> buff
Channel{Any}(1) (1 item available)

julia> take!(buff)
3-element Vector{Float64}:
 0.0
 0.0
 0.0
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