Dear GROMACS users,

I would like to ask a question concerning about the simulation of a water 
droplet, with SWM4-DP polarizable water model in nonperiodic boundary 
conditions. The GROMACS version I use is 2018.2. I have been only able to 
successfully run the simulation with only “Group” as the cutoff scheme in non 
PBC.  Multiple OpenMP threads are not supported with “Group”. Also, shell 
particles are not implemented with domain decomposition, so I have not been 
able to run the simulation with more than a single core. The following commands 
are what I use (with thread-MPI)gmx_mpi grompp -f eq.mdp -c em.gro -p 
swm4-dp.top -r posre.gro -o eq.tprmpirun -np 1 gmx_mpi mdrun -ntomp 1 -deffnm eq
In the paper “Atomistic simulation of ion solvation in water explains surface 
preference of halides” by Prof. David Van der Spoel in 2011 (doi: 
10.1073/pnas.1017903108), they also used the SWM4-DP water model in non PBC (no 
cutoffs) in GROMACS. I can only guess they used multiple cores for their 
simulations, or did they? Does anyone know if it is possible to run multiple 
cores to simulate SWM4-DP in non PBC?

Attached are the mdp setting and topology for your reference.Thanks.
Best,Chi Yuen
mdp setting:  https://www.dropbox.com/s/e1sord21slgn084/eq.mdp.pdf?dl=0

topology: https://www.dropbox.com/s/0gj8ot2m6k8b019/swm4-dp.top.pdf?dl=0

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