On Mon, Feb 17, 2014 at 12:41 PM, Phil Smith <philbo...@gmail.com> wrote:
> I'm currently loading some new servers with CentOS6 on which perl5.10 is > the standard version of perl provided. However, I've also loaded perl5.18 > and I don't think the version of perl is significant in the results I'm > seeing. Basically, I'm seeing perl performance significantly slower on my > new systems than on my 6 year old systems. > > Here's some of the relevant details: > > + 6 year old server, 32 bit architecture, CentOS5 perl5.8 > perl, and in particular regexp operations, perform reasonably fast. > > + Very new server, 64 bit architecture, CentOS6, perl5.10 (and have tried > perl5.18) > perl, and in particular regexp operations, perform significantly slower > than on the 6 year old server. That struck me as odd right off. I though > surely, perl running on a modern high-end cpu is going to beat out my code > running on 6 year old hardware. > > I've compared CPU models at various CPU benchmarking sites and the new > CPUs, as you would expect, are ranked significantly higher in performance > than the old. > > I've also installed perl5.8 on the new 64bit servers and the performance > is similar to that of perl5.10 and perl5.18 on the same 64bit servers. > Given that, I don't think perl version plays a significant factor is the > performance diffs. > > Is it an accepted fact that perl performance takes a hit on 64 bit > architecture? > > I've tried comparing some of the perl -V and Config.pm results looking for > significant differences. That output is pretty verbose and the most > significant difference is the architecture. > > I could provide some of my benchmarking code if that would be of help. The > differences are significant. The only reason I'm looking at this is because > I could see right off that some of my code is taking 30-40% longer to run > in the new environment. Once I started putting in some timing > with Time::HiRes I could see the delay involved large amounts of regexp > processing. > > Right now, I'm just looking for any opinions on what I'm seeing so that I > know the architecture is the significant factor in the performance > degradation and then consider any recommendations for improvements. I'm > happy to provide further relevant details. > This sounds like it could be something OS-specific and, googling "CentOS regex performance" generates hits, eg, > > http://pkgs.org/centos-5/puias-computational-x86_64/boost141-regex-1.4.0-2.el5.x86_64.rpm.html > HTH, Charles DeRykus
