Re^7: selecting columns from a tab-separated-values file

in reply to Re^6: selecting columns from a tab-separated-values file
in thread selecting columns from a tab-separated-values file

With 80GB of data and 384GB of ram, I's remove IO thrash from the picture entirely by slurping the entire dataset into ram first. Something like this:

#! perl -slw
use strict;

open my $fh, '<:raw', $ARGV[ 0 ] or die $!;
sysread $fh, my $slurp, -s( $ARGV[0] );
close $fh;

local $, = "\t";
open RAM, '<', \$slurp;
while( <RAM> ) {
    my @f = split "\t";
    print @f[ 2,0,5 ], 
}
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