Your IRS_while(), does not return the same information as the other two subroutines. Push returns the size of the array after update. Assignment returns the assigned value. Is it possible that you are getting bogus results due to that?
#!/usr/bin/perl use strict; use warnings; use Benchmark qw(cmpthese); my $count = -100; cmpthese($count, { 'Split' => sub { my $document; open(FILE, 'removed.xml') or die "Error [$!]\n"; while (<FILE>) { $document .= $_ } my @lines = split('\|',$document); return @lines; }, 'IRS_while' => sub { local $/ = '|'; my @lines; open(FILE, 'removed.xml') or die "Error [$!]\n"; while (<FILE>) { chomp; push @lines, $_; } return @lines; }, 'IRS_map' => sub { local $/ = '|'; open(FILE, 'removed.xml') or die "Error [$!]\n"; my @lines = map {chomp; $_} (<FILE>); return @lines; }, });
Results:
andRate IRS_map Split IRS_while IRS_map 9804/s -- -24% -27% Split 12876/s 31% -- -4% IRS_while 13399/s 37% 4% --
This is perl 5, version 12, subversion 3 (v5.12.3) built for MSWin32-x +86-multi-thread
Benchmark newbie, so I am certain that I will be corrected if I have also misapplied the tool :-)
Update: To tie into a comment by 2teez, my versions of this seem to be spending a large amount of time in open (32% of total time) and readline (18% of total time) -- a whopping 50% of the total time, with those two items being the top two runners when sorted by exclusive time under Devel::NYTProf.
--MidLifeXis
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