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