http://www.perlmonks.org?node_id=1082788


in reply to Using 64 Bit Perl for Production Scripts.

Firstly, I have been using 64-bit Perl more or less exclusively for the past few years on a variety of Linux, Windows, and Mac systems, with 50+ modules (many of them XS, don't have an exact count on that, though), and have had zero issues that would have been avoided with a 32-bit Perl.

Secondly, my own anecdotal experience shouldn't mean squat to you. :-) Fortunately, the Perl module ecosystem (and Perl itself) are blessed with some of the best unit tests in the industry (see Test::More for a start). As long as your own software also has good unit tests, you are already a long way to verifying your installation.

Thirdly, if you still have any doubt, it's worth questioning whether 64-bit Perl would actually make any substantial difference in your installation. By themselves, 64-bit programs do not inherently outperform their 32-bit counterparts. There are a couple of cases where they do:

However, there's a downside: 64-bit programs are larger (again, depends, but I've seen 10-30%), and consequently use more RAM, which can increase memory traffic, which can actually degrade performance a little. Probably not terribly significant, but again, benchmark.

For "SAN Management Servers", you are probably not using significant RAM or doing anything computationally expensive (think: decoding human genome, solving chess, etc.), so to be honest, it's probably not going to make a huge difference. So, as above, unit tests (and your own functional and integration testing) will guide you.