Firstly, you slurp the entire file into memory with the line that reads @file = <FILE>;. Secondly, you loop over each line of the file many many times. Also, not relating to your problem per se, but you are using an array that contains a single array reference and it doesn't look like there's any reason for that (@ranges will always have one element, the reference to your 4 values. Similar for @range_counts since it's built from @ranges).

duff

In reply to Re: inefficient code? works on small files ok but not larger ones by duff
in thread inefficient code? works on small files ok but not larger ones by Anonymous Monk

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