I have written sorting script using external sort and here is the code. Currently this is being used to sort large file size of nearly 5GB and time taken to complete the sorting is 32 minutes on windows 64 bit(64 bit active perl ) 12GB RAM.Wanted to know if the performance can be increased/improved or is this with good performance? Does my code needs any modification? I have also attached sample data to sort. Please help. 

input lines:
2012/12/13 @ 13:32:35,585 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/12/13 @ 13:32:34,585 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/12/13 @ 12:32:35,485 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/12/13 @ 13:35:35,585 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/12/13 @ 14:32:35,585 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/12/15 @ 13:32:35,612 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/12/12 @ 11:32:35,585 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer
2012/10/13 @ 13:32:45,735 @ ,, INFO  [EJB3Deployer] Starting java:comp
+ multiplexer


 $\ = "\n" ; $, = "\t" ;
 use strict;

use warnings;

use Sort::External;


print "Script start time is\n ", scalar localtime();

open DATA, "sort_input.txt";
open OUTPUT, ">>sort_output.txt";

my $sortscheme = sub { my @flds_a = split(/,,/, $Sort::External::a);

                  my @flds_b = split(/,,/, $Sort::External::b);

                   $flds_a[0] cmp $flds_b[0]; };

#my $temp_directory = '/home/david/temp';

my $sortex = Sort::External->new(  mem_threshold => 1024**2 * 16,
                                   sortsub         => $sortscheme,  
                                  #working_dir     => $temp_directory,
                                  );

while (<DATA>) {   
 chomp;

    $sortex->feed($_);}

$sortex->finish;

while ( defined( $_ = $sortex->fetch ) ) 
{   
print OUTPUT $_;
}
 
 
 close DATA;
 close OUTPUT;
 
 print "Script end time is\n ", scalar localtime();

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In reply to external sort performance improved? by rkshyam

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