Lua function performance comparison

#!/usr/bin/env lua
# Lua speed comparison

local function measure (fn)
    local t0 = os.clock()
    for i = 1,10000 do
        fn()
    end
    print (os.clock() - t0 .. " seconds")
end

local function v1()
    local function addv1(n)
        local sum = 0
        for i=1,n do
            if i % 2 == 0 then
                sum = sum + i
            end
        end
        return sum
    end
    addv1(10000)
end

local function addv2(n)
    local sum = 0
    for i=1,n do
        if i % 2 == 0 then
            sum = sum + i
        end
    end
    return sum
end

local function v2()
    addv2(10000)
end

measure(v1)
measure(v2)