[gmx-users] P-LINCS and nstlist
Mark.Abraham at anu.edu.au
Thu May 19 00:29:38 CEST 2011
On 19/05/2011 1:39 AM, Justin A. Lemkul wrote:
> Sławomir Stachura wrote:
>> Dear Users,
>> I am not sure if I understood properly how P-LINCS should
>> parametrized for simulation. In manual it's written that "one
>> coordinate communication step is required for the initial LINCS step
>> and one for each iteration"; so as coordinate communication is
>> tightly binded to neighbor searching, does it mean that nstlist
>> should equal "1"? I mean - should neighbor list be updated every
>> simulation step for proper use of constraints in parallel with LINCS?
>> I have searched for the answers in mailing list, but I was
>> unsuccesful in finding tone.
> The quoted passage is related to domain decomposition communication,
> not neighbor searching. The algorithms involved are rather complex,
> and (usually) work without much manual intervention.
> nstlist is more directly related to dt, and is often connected to the
> force field, as well. Values of 5-10 are standard.
Values of 10 with dt=0.002 are normal, but with longer time steps
smaller values of nstlist are wise. constant = nstlist * dt is probably
a wise rule of thumb.
> Setting nstlist = 1 is usually only necessary for EM, not MD.
> Excessive updating of the neighbor list can result in performance
> loss, I believe.
>> Thanks in advance,
>> Slawek-- gmx-users mailing list gmx-users at gromacs.org
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