The document discusses benchmarking and optimizing Perl code. It provides an overview of common tools for profiling Perl programs, such as Benchmark.pm, Devel::SmallProf and Devel::NYTProf. It outlines factors to consider before and after benchmarking like memory usage, CPU usage and deployment environment. Examples are given demonstrating how using modules or custom functions can improve performance compared to plain Perl code. The document stresses the importance of understanding profiling data in the context of the full system before performing optimizations.

1.
1H.com
1H.com
Benchmarking the
Efficiency of Your Tools
Marian Marinov - mm@1h.com
Co-founder & CEO of 1H Ltd.

3.
$ $$ $$$ $$ $
If you rate my survey, I'll hook you up with $20 cPCache $$$.
Go to this address to take the survey:
http://go.cpanel.net/b11
and come up to the podium once you've completed it.

6.
Before benchmarking
@INC:
/usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.7/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.6/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.8
/usr/lib/perl5/site_perl/5.8.7
/usr/lib/perl5/site_perl/5.8.6
/usr/lib/perl5/site_perl/5.8.5
/usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.7/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.6/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.8
................

11.
file-bench-module.pl
#!/usr/bin/perl
use strict;
use warnings;
use File::Util;
my $dir = '/home/hackman/bench-tests';
my $f = File::Util->new();
foreach my $obj ($f->list_dir($dir)) {
print "$obj";
}

12.
file-bench-plain.pl
#!/usr/bin/perl
use warnings;
use strict;
my $dir = '/home/hackman/bench-tests';
opendir B, $dir;
while (my $obj = readdir(B)) {
print "$obj";
}
closedir B;

13.
file-bench-sub.pl
#!/usr/bin/perl
use warnings; use strict;
my $dir = '/home/hackman/bench-tests';
sub check_dir {
my $dir = shift;
opendir B, $dir;
while (my $obj = readdir(B)) {
print "$obj"; }
closedir B;
}
check_dir($dir);

18.
A module load times
$ perl -d:Dependencies -MFile::Util -e 0
Devel::Dependencies finds 10 dependencies:
/usr/lib/perl5/site_perl/5.8.8/auto/File/Util/autosplit.ix
AutoLoader.pm
Class/OOorNO.pm
Exporter/Heavy.pm
Fcntl.pm
File/Util.pm
XSLoader.pm
constant.pm
vars.pm
warnings/register.pm
No DB::DB routine defined at -e line 1.

19.
Profile your apps
Devel::NYTProf

22.
Questions
? ? ? ?
? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ?
? ?

23.
Thank you
Please visit us at Booth 23
Marian Marinov - mm@1h.com
Co-founder & CIO at 1H Ltd.
1H.com
1H.com