The beauty of Perl is choice. Some would argue there’s too much of it. When it comes to advanced OO features, Perl has many options to choose from. None of them are actually in the core but are available as third-party modules from CPAN. This will hopefully get fixed in the future.
One such an OO framework that is really popular among Perl developers is Moose. The problem with Moose is that it does everything and it also depends on many outside modules. But Moose led to some interesting experiments, one of which is Mo. Along with Mo, I have evaluated another minimal OO class builder for Perl, named Class::Tiny, which is in fact an Object::Tiny workalike. Confused already?
I like both class builders because they are minimal require no outside modules, so I had to test which one of them offered more useful features while still being fast. The code that I used to do this is available here. For the second test everything in the main package was wrapped inside a loop that ran 1e6 times. Current versions (Mo 0.37 and Class::Tiny 0.011) were tested on an Athlon 64 x2 box running at 1 Ghz with two gigs of RAM. Here are the results:
|1 run||1e6 runs||1 run||1e6 runs|
As you can see, Mo turned out to be 51% faster in single runs and 28% faster when it ran multiple times. It also has some additional features, without enfocing them on the user – they have to be explicitly enabled. Mo also provides an easier and more obvious upgrade path to Moo, Mouse or Moose. It does not, however, provide multiple inheritance or a destroy method. If you need them, use Class::Tiny or Moo. Also, please keep in mind that benchmarking Mo against Class::Tiny is rather pointless because their feature set is different.
I repeated the test using Benchmark, this time appending to my favourite file descriptor. Mo came out faster by almost 50%. When writing to standard output the results are roughly the same as above. I also tested Mojo::Base, Object::Simple and Object::Tiny. They are roughly on par with one another and a tad faster than Mo, but the difference is only about 16%. Object::Tiny came out the fastest of the bunch.