Testing iterating through objects at global scope

itertest.jl

function for_in!(arr::Array{Float32})
    l::Int = length(arr)
    for i::Int in 1:l
        arr[i] += 2pi
    end
    gc()
end

function while_loop!(arr::Array{Float32})
    i::Int = 1
    l::Int = length(arr)
    while i <= l
        arr[i] += 2pi
        i += 1
    end
    gc()
end

function run_test()
    println("\nTesting at function scope")
    println("-------------------------")
    arr = Array(Float32, 1024)
    # run once for jitting
    for_in!(arr)
    while_loop!(arr)
    println("Testing For Iteration")
    gc()
    @time for_in!(arr)
    println("@allocated: ", @allocated for_in!(arr))
    println("Testing While Iteration")
    gc()
    @time while_loop!(arr)
    println("@allocated: ", @allocated while_loop!(arr))
end

println("\nTesting at global scope")
println("-----------------------")
arr = Array(Float32, 1024)
# run once for jitting
for_in!(arr)
while_loop!(arr)
println("Testing For Iteration")
gc()
@time for_in!(arr)
println("@allocated: ", @allocated for_in!(arr))
println("Testing While Iteration")
gc()
@time while_loop!(arr)
println("@allocated: ", @allocated while_loop!(arr))

run_test()

# Testing at global scope
# -----------------------
# Testing For Iteration
# elapsed time: 0.012072643 seconds (13856 bytes allocated, 90.73% gc time)
# @allocated: 0
# Testing While Iteration
# elapsed time: 0.010270464 seconds (80 bytes allocated, 99.85% gc time)
# @allocated: 0
#
# Testing at function scope
# -------------------------
# Testing For Iteration
# elapsed time: 0.010121247 seconds (0 bytes allocated, 99.95% gc time)
# @allocated: 0
# Testing While Iteration
# elapsed time: 0.009629785 seconds (0 bytes allocated, 99.95% gc time)
# @allocated: 0