On Mon, Feb 17, 2014 at 6:16 PM, Charles DeRykus <dery...@gmail.com> wrote:
> > 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 >> > > No, I really don't think it is specific to a version of CentOS. I've > installed various permutations of 32 and 64 bit CentOS 5 and 6. The better > performance seems to follow the 32 bit architecture rather than a specific > Perl version or CentOS version. > Phil > > >
