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Re: Optimise file line by line parsing, substitute SPLIT

by nbtrap (Sexton)
on Jun 06, 2013 at 02:04 UTC ( #1037347=note: print w/ replies, xml ) Need Help??

in reply to Optimise file line by line parsing, substitute SPLIT

If memory is not lacking, you can slurp the entire file and then process the lines, as in:
#!/usr/bin/perl use warnings; use strict; my $file = "/Path/to/file/file_X.txt"; open(my $fh, '<', $file) or die("Can not open file $file to read!\n"); my @lines = <$fh>; close($fh); for (@lines) { chomp; ## process the rest here, including calls to split } print "\n# of lines: " . scalar(@lines) . "\n";
This has a good chance to speed things up, presumably because perl will make fewer calls to read(2).

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