[gmx-users] Core i7 vs Core2Quad

[Berk Hess]

That is incorrect.

A Core I7 is about 40% faster with hyperthreading turned off.
A Core I7 is about 65% faster with hyperthreading turned on
and running 8 processes.

What you should NOT do (but which can happen very easily)
is running on a Core I7 with hyperthreading turned on and using
only 4 processes. In that case the processes are distributed
randomly over the 8 virtual and 4 real cores and the chance
is very high that at least one real cores gets 2 mdrun processes
and your simulation is nearly 50% slower than it could be.

If somebody has a solution for this problem under Linux,
that would be extremely useful.

Berk

> Date: Tue, 15 Sep 2009 14:20:09 +0200
> From: Antoine.Fortune at ujf-grenoble.fr
> To: gmx-users at gromacs.org
> Subject: Re: [gmx-users] Core i7 vs Core2Quad
> 
> I7 about 20% faster at same clock speed ...
> Antoine
> 
> 
> 
> marcos a écrit :
> > Hi,
> >         
> > I wander if somebody has compared Core i7 vs Core2Quad in Gromacs
> > simulations.
> > Is Core i7 faster in a per clock basis?
> >         
> > Marcos.
> >         
> >         
> >         Marcos Villarreal
> >         
> >
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