Improving mod_perl Driven Site’s Performance — Part III: Code Profiling and Memory Measurement Techniques Page 6

  % perl -MO=Terse -e 'my %hash' | wc -l
  -e syntax OK
      4

  % perl -MO=Terse -e 'my %hash = ()' | wc -l
  -e syntax OK
     10

The first one has less opcodes.

Note that you shouldn't use Apache::Status module on production

server as it adds quite a bit of overhead for each request.

References


The mod_perl site’s URL: http://perl.apache.org


Devel::DProf
http://search.cpan.org/search?dist=DProf


Apache::DProf
http://search.cpan.org/search?dist=Apache-DB


Apache::VMonitor
http://search.cpan.org/search?dist=Apache-VMonitor


GTop
http://search.cpan.org/search?dist=GTop

The home of the C library: http://www.home-of-linux.org/gnome/libgtop/


BSD::Resource
http://search.cpan.org/search?dist=BSD-Resource