[gmx-users] problem with MPI version under OSX

Erik Lindahl lindahl at csb.stanford.edu
Fri Oct 31 18:59:00 CET 2003

Hi Dean,

That sounds like a problem with MPI and not Gromacs (unless you had 
other things running that affected load balancing).

Since Gromacs combined with LAM-MPI works well on x86 and other 
platforms I don't think there is much that can be done in Gromacs - 
have you checked the LAM-MPI site/mailing-list?



On Oct 31, 2003, at 7:11 AM, Dean Johnson wrote:

> Howdy all,
> Just in case someone has resolved or worked around the problem, I
> thought I would ask. Has anybody fixed the problem under OSX that you
> can run only one instance per dual machine under MPI? I find that it
> does in fact run if you run two instances, just very very VERY slowly. 
> I
> left an '-np 2' job running on a single dual 2Ghz G5 machine and it ran
> at a whopping 46Mflops. ;-)
> -- 
> 	-Dean
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