Re: CCL:Experiences with 64 bits AMD processors

Yes,  32 bit binaries will run on these chips, assuming that you are using
 and
 running your linux  OS in 64 bit mode. The catch is that you need the
 following
 1. a. Your 64 bit kernel should be built to support 32 codes (This is done by
 enabling the 32 bit emulation flag when configuring your linux 2.6 kernel
  b. Note amd64 is deprecated on 2.4 linux kernels
 2.a. You need to install base emulation  libraries for  running 32bit x86 on
 amd64. These include the gibc in 32 bits
    You need to install  X11R6 emulation  libraries for running  32bit x86
 X-window applications on amd64.
 3. If you want to compile 32 binaries you need to also enable multi lib
 version of gcc (i.e. supports building of both 32 and 64 bit codes
 Pleas note that emulation does not imply that the code is slower on amd64,
 infact that same binary  running in amd64 architecture out performs  the same
 binary running in a 2.8 Ghz Pentium 4 linux box.
 These information is based on what I had to do to enable 32 bit support in my
 Gentoo linux box (amd64 3200+)  which I built to run in 64 bit mode
  If you are interested in gentoo linux and in running 32 and 64 bit codes
 simulataneously see
 http://www.gentoo.org/proj/en/base/amd64/technotes.xml
   inOn Tuesday 10 June 2003 01:09 pm, you wrote:
 > Hello,
 > we  are interested in buying some more computational resources. In our
 > group we are interested in 64 bit AMD processors, but we do not know
 > about their compatibility. They are supposed, as AMD says,  to be32 bit
 > compatible and therefore AMD 64 bit processor should be able to run any
 > 32 bit application. Is that true? Any experience about this will help us
 > a lot.
 > By the way, we are running mainly gaussian jobs, and have some other 32
 > bit binaries like turbomole and jaguar. We have source code license for
 > gaussian 03. Has anyone tried to compile Gaussian 03 for a AMD 64 bit
 > machine? Do 32 bit pentium binaries run correctly on a 64 bit processor?
 > which is the increase on the performance? Do Turbomole and Jaguar
 > binaries run on 64 bit AMD processors? anyone tried?
 > Any information will be helpful.
 > Thanks a lot
 > Marc
 >
 > ---------------------------
 > Marc Noguera Julian
 > Thcnic Especialista de Suport a la Recerca
 > Qummica Fisica, Universitat Autrnoma de Barcelona.
 > Tlf: 00-34-935812173
 > Fax: 00-34-935812920
 > e-mail: marc*at*klingon.uab.es
 > ---------------------------------------
 >
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 --
 Jerry Ebalunode
 Ph.D. Candidate
 RM 402F Houston Science Center
 Phone: 713-743-8367
 Dept. of Biology and Biochemistry
 University of Houston
 4800 Calhoun Road
 Houston, TX 77204