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Re: [ESPResSo-users] Boltzmann swimmers on GPUs

From: Henri Menke
Subject: Re: [ESPResSo-users] Boltzmann swimmers on GPUs
Date: Mon, 6 May 2019 22:01:17 +1200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Dear Martin,

The swimmers only work on a single MPI node with CPU LB because otherwise
another ghost layer would be required.  Back when we implemented the swimmers
for CPU LB we only did so for verification purposes.  Since the GPU LB is
orders of magnitude faster, this should always be the preferred implementation.
However, the GPU LB is limited to a single GPU as a whole.

There is also a tutorial on active matter which you can find in the source tree
or at

Kind regards,

On 6/05/19 9:44 PM, Martin Kaiser wrote:
> Hello everybody, quick question,
> I am not sure that I interpret the documentation correctly and couldn’t seem 
> to find a satisfying answer in the source code.
> It is stated that Lattice-Boltzmann swimmers are ”only supported on one Open 
> MPI node”. As this does not point to GPU nodes, do I understand correctly 
> that Lattice-Boltzmann swimmers are functional with the CUDA implementation 
> of LB??
> Thanks for the help,
> Martin

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