[gmx-developers] Exclude specific nonbonded interactions during md rerun for Verlet

[Mark Abraham]

True for the first part, but rerun does not ever need a buffer, because
neighbour search is every frame.

Mark

On Fri, Sep 12, 2014 at 7:30 PM, Berk Hess <hess at kth.se> wrote:

> Hi,
>
> You can use the group scheme for the rerun only. If you use the same
> potential modifiers and add a buffer to rlist, you should get exactly the
> same answer as the Verlet scheme.
>
> We should come up with a way to do this with the Verlet scheme when we
> remove the group scheme.
>
> Cheers,
>
> Berk
>
>
> On 09/12/2014 05:20 PM, Bernd Doser wrote:
>
>> Hi Berk,
>>
>> thanks for your answer. We store force contributions between two atoms
>> to analyze them. This storage will be performed during a rerun. We want
>> to exclude the unneeded interactions to speed-up the rerun, since we are
>> only interested in forces between two atom groups.
>>
>> Cheers,
>> Bernd
>>
>> On 09/12/2014 04:21 PM, Berk Hess wrote:
>>
>>> Hi,
>>>
>>> Why do you need to exclude energy group interactions during rerun?
>>> Since you will have all the energy group pair contributions you can
>>> manually subtract the terms you want to exclude. You wouldn't even need
>>> a rerun for that if you used the energy groups for the production run.
>>>
>>> Cheers,
>>>
>>> Berk
>>>
>>> On 09/12/2014 03:26 PM, Bernd Doser wrote:
>>>
>>>> Dear GROMACS developers,
>>>>
>>>> As the energy group exclusions are not implemented for the Verlet cutoff
>>>> scheme, I am search for a alternative possibility to exclude specific
>>>> nonbonded interactions during an md rerun.
>>>>
>>>> One idea is to use the topology exclusion list. The top->excl arrays
>>>> could be modified for example at the beginning of do_force() in
>>>> sim_util.c. I have tested it for a small protein and a water dimer and
>>>> it works. Is there any problem doing this for more complex structures or
>>>> have anyone a better idea to exclude nonbonded interactions to reduce
>>>> computation time?
>>>>
>>>> Thank you very much in advance!
>>>>
>>>> Best regards,
>>>> Bernd Doser
>>>>
>>>>
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