[gmx-users] SSE4 → AVX2

[Mark Abraham]

Hi,

Assuming your compiler is up to the job (which it is if you followed the
install guide and got a recent compiler),

cmake -DGMX_SIMD=AVX_256

See
http://www.gromacs.org/Documentation/Installation_Instructions?highlight=install+guide#simd-support
and
http://www.gromacs.org/Documentation/Installation_Instructions?highlight=install+guide#TOC

(Same for 4.6, but the option is named differently, so
-DGMX_CPU_ACCELERATION=AVX_256)

Mark


On Wed, Aug 27, 2014 at 10:44 AM, nicola staffolani <n.staffolani at unitus.it>
wrote:

> Dear Gromacs users & developers,
>
> my computer tells me that, if I'd use AVX_256 instead of SSE4, then my
> simulations would be done much faster. Which changes in which files do I
> have to do in order to achieve this? I have serched the mailing list but
> couldn't find the explicit answer: I warn you that I am not so much of a
> geek, therefore suggesting me, for example, to change the path, without
> telling me which precise actions I have to carry on (for example, as
> already said, which lines I have to change/add in which file) in order to
> achieve this, will only generate the next email from my side and then,
> since by then you will have already started answering me, you will lose
> more time answering me back than if you would have precisely described in
> the first reply the order of precise actions needed to be done in order to
> achieve the goal ;)
>
> Thank you for helping and have a nice day/night, ​
>
> ​Nicola​
> --
> Nicola Staffolani PhD
> Biophysics & Nanoscience Centre CNISM <http://www.unitus.it/biophysics>
> Università della Tuscia
> Largo dell'Università s.n.c., I-01100 Viterbo
> email: n.staffolani at unitus.it
> tel.: +39 0761 35 70 27; fax: +39 0761 35 71 36
> --
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