performance - Lua string to number parsing speed optimization -

i trying make speedtest using lua 1 of languages , wanted advice on how make code bit faster if possible. important own speedtest, since looking @ specific parameters.

the code reading file looks this, numbers randomly generated , range 1 zu 1 000 000. there between 100 , 10 000 numbers in 1 list:

type (123,124,364,5867,...)  type (14224,234646,5686,...)  ... 

the type meant language, can ignored. put here know why not parsing every line. lua code:

incr = 1 line in io.lines(arg[1])   incr = incr +1   if incr % 3 == 0     line:gsub('([%d]+),?',function(n)tonumber(n)end)   end end 

now, code works , want do. not getting work, speed. need ideas , advice make code work @ optimal speed.

thanks in advance answers.

imho, tonumber() benchmarking rather strange. of cpu time spent on other tasks (regexp parsing, file reading, ...).

instead of converting number , ignoring result more logical calculate sum of numbers in input file:

local gmatch, s = string.gmatch, 0  line in io.lines(arg[1])   n in gmatch(line, '%d+')     s = s + n  -- converting string number automatic here   end end  print(s)