[gmx-users] Gromacs slow and crashes on Leopard.

[Carsten Kutzner]

Hadas Leonov wrote:
> After installing with openmpi - I ran some benchmarks for 4 processors
> on Mac-Pro:
> d.villin:       
> Leopard performance: 	13714 ps/day
> old OS performance:    41143 ps/day.
> gmx-benchmark :          48000 ps/day.
> 
> d.poly-ch2
> Leopard performance:  8640 ps/day
> old OS performance:    18000 ps/day
> gmx-benchmark:            20571 ps/day
> 
> old OS refers to OSX 10.4.9.
> The slow speed also happens when running only on one CPU. d.villin took
> 6 times slower than usual. So it can't just be open-mpi fault, can it?
> 
> Can it be due to compiling gromacs while disabling ia32 optimization?
Hi Hadas,

probably you are running the C inner loops now. You will want to not
only disable the Itanium inner loops, but at the same time enable the
x86 inner loops.

Carsten