Let's optimize the split-funtion and see how fast we can get: 
#!/usr/bin/perl
use strict;
use warnings;
use Benchmark qw(:all) ;

# Set up an array of data to test
my $data = '0906928472847292INR~UTRIR8709990166~     700000~INR~200806
+23~RC425484~IFSCSEND001                       ~Remiter Details ~10000
+07   ~TEST RTGS TRF7                     ~                           
+        ~                                   ~ ~RTGS~REVOSN OIL CORPOR
+ATION   ~IOCL  ~09065010889~0906501088900122INR~         7~         1
+~ 1';
my @data;
push @data, $data for 1 .. 1000;

cmpthese(1000, {
    'Full split'      => sub {my @refnos; for (@data){my @splitted = s
+plit(/~/,$_);   push(@refnos,$splitted[1]);}},
    'Limited split'   => sub {my @refnos; for (@data){my @splitted = s
+plit(/~/,$_,3); push(@refnos,$splitted[1]);}},
    'Optimized split' => sub {my @refnos; for (@data){push @refnos, (s
+plit(/~/,$_,3))[1];}},
    });

[download]

Results:

                  Rate      Full split   Limited split Optimized split
Full split      23.1/s              --            -82%            -93%
Limited split    127/s            452%              --            -63%
Optimized split  343/s           1387%            169%              --

[download]

Some things to remember:

By using these simple rules, we get an almost 14 fold speed increase!

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re: Needed Performance improvement in reading and fetching from a file by CountZero
in thread Needed Performance improvement in reading and fetching from a file by harishnuti

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