-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have so far avoided using the x86_64 distro, sticking to 32 bits on all my servers. My question for all using the 64bits distro is: is it really worth it ? What kind of applications are you running, and what kind of _real_ gain did you have ? Note: All my servers are 2GB RAM or less. - -- Rodrigo Barbosa "Quid quid Latine dictum sit, altum viditur" "Be excellent to each other ..." - Bill & Ted (Wyld Stallyns) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFFKmtUpdyWzQ5b5ckRAk//AKCTvsGQ4YS+B6G60TaSjAbUOf5vwACeOlnT s6HYeQqrbG5ybbyCcw+iC7M=67Sx -----END PGP SIGNATURE-----
Rodrigo Barbosa wrote:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I have so far avoided using the x86_64 distro, sticking to 32 bits on all > my servers. > > My question for all using the 64bits distro is: is it really worth it ? > What kind of applications are you running, and what kind of _real_ > gain did you have ? > > Note: All my servers are 2GB RAM or less. >I have avoided 64-bit CentOS until very recently even though I have a lot of servers that are capable of running it. That avoidance has been mostly the result of my own paranoia about not wanting to "fix" things that aren't broken combined with the fact that I didn't have any applications that seemed to "want" 64-bit CentOS in order to get a performance benefit. Recently, I decided to take the plunge on a couple of new systems as they all had at least 4 64-bit cores, 2-4gb RAM, and large disk arrays and one of my newer applications seems to work better with 64-bit Linux (so I'm told...it actually seems less stable to me). I haven't noticed any real benefit and I also haven't noticed any problems since these are all server systems. I suspect all the gotchas come into play when you want to run desktop/workstation applications that might not have been cleaned up for 64-bits yet...especially if they're only available as binaries. Cheers,
On Mon, 9 Oct 2006 at 12:31pm, Rodrigo Barbosa wrote> I have so far avoided using the x86_64 distro, sticking to 32 bits on all > my servers. > > My question for all using the 64bits distro is: is it really worth it ? > What kind of applications are you running, and what kind of _real_ > gain did you have ? > > Note: All my servers are 2GB RAM or less.As usual, it depends. All my cluster nodes are x86_64, and I've seen anywhere from 10-50% performance gains with some codes going from i386 to x86_64. These are mostly commercial codes -- FEM (LS-DYNA) and Matlab. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University
On Monday 09 October 2006 17:31, Rodrigo Barbosa wrote:> I have so far avoided using the x86_64 distro, sticking to 32 bits on all > my servers. > > My question for all using the 64bits distro is: is it really worth it ? > What kind of applications are you running, and what kind of _real_ > gain did you have ?two things that might get forgotten: 1) all mem as low mem, no more highmem stuff for RAM > ~900 MiB 2) 8k kernel stack instead of 4k, a must if you want XFS /Peter> Note: All my servers are 2GB RAM or less.-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos/attachments/20061009/ffb3ead6/attachment-0002.sig>
Rodrigo Barbosa wrote:> I have so far avoided using the x86_64 distro, sticking to 32 bits on all > my servers. > > My question for all using the 64bits distro is: is it really worth it ? > What kind of applications are you running, and what kind of _real_ > gain did you have ?apache, postfix, mailman on centos-4.4 data throughput to and from hard disks via 3ware9550SXU-4LP is much faster than with the same hardware and a 32 version (about +40 to +50%, I tried it). It's definitely worth it but it certainly depends on your hardware. First I got a bit confused about the lib64 directories and the ability to have 32 bit packages, but once you get used to it, it's easy to handle. I'll stay at x86_64.> > Note: All my servers are 2GB RAM or less.4GB. Regards - Michael -- Michael Kress, kress at hal.saar.de http://www.michael-kress.de / http://kress.net P E N G U I N S A R E C O O L