http://www.perlmonks.org?node_id=1160671


in reply to Re^5: How to optimize a regex on a large file read line by line ?
in thread How to optimize a regex on a large file read line by line ?

You're welcome. I forgot to add that my hard drive is SSD, although this would NOT account for 11 minutes difference.

Update added missing negation, thanks ww

perl -ple'$_=reverse' <<<ti.xittelop@oivalf

Io ho capito... ma tu che hai detto?
  • Comment on Re^6: How to optimize a regex on a large file read line by line ?

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Re^7: How to optimize a regex on a large file read line by line ?
by John FENDER (Acolyte) on Apr 16, 2016 at 21:52 UTC

    It make a big difference !!!

    Regarding the other performance i get from other language, i was expected something between 50 and 100 s. My hard drive is a 2.5 laptop disk with 5200 tpm. The ultra optimized grep.exe give me a very good result of 10s, it's the best time i can get.

    But before i was going to check huge volumes, perl was fast. For the 195 mb file, i got 0,61s for grep, 2,25 for java/C#, 3,36 for php, 7 for C++ and 2,47 for perl.