[gmx-users] Opteron: compile with 32-bit SSE

David spoel at xray.bmc.uu.se
Thu Sep 9 23:09:29 CEST 2004

On Thu, 2004-09-09 at 22:26, Amadeu Sum wrote:
> I would like to ask the help from those who are using Gromacs in the
> Opteron system.
> I have read many of the posting related to the performance issue and
> it seems that Gromacs compiled in 32-bit with SSE works better in the
> Opteron.  Can anyone point out what are the options/flags they are
> using to get Gromacs to compile in an Opteron system in 32-bit with
> SSE? I can get it to compile in 32-bit, but I have been unable to get
> SSE. I am specifying:
> CPFLAGS = -O6 -fomit -fomit-frame-pointer -finline-functions -Wall
> -Who-unused -malign-double -funroll-all-loops -m32 -msse -msse2
> -mfpmath=sse
> I have also tried explicitly specifying "--enable-x86-asm" and
> "--disable-cpu-optimization" in configure, but that has not helped.
> I am using gcc v3.2.3
Do you have a normal pentium somewhere?
Then your best bet is to compile there with the intel compilers---

> Thanks in advance,
>                          Amadeu
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David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  	75124 Uppsala, Sweden
phone:	46 18 471 4205		fax: 46 18 511 755
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://xray.bmc.uu.se/~spoel

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