[gmx-users] Launching MPI/OpenMP hybrid run

[Carsten Kutzner]

On 04 Mar 2014, at 13:08, Alexander Björling <alex.bjorling at gmail.com> wrote:

> Dear users,
> 
> I'm trying to run simulations on a cluster of nodes, each sporting two AMD
> Opteron 8-core CPU:s. I would like to have one MPI process on each CPU,
> with OpenMP threads on the 8 cores of each. I've compiled gromacs 5.0 with
> intel MPI and OpenMP enabled.
> 
> To get it running I'm just using two nodes, so 4 MPI processes. I've been
> using various combinations of the type:
> 
> mpirun -np 4 -perhost 2 gmx_mpi mdrun -ntomp 8 ...,
> 
> but I never manage to get the MPI process spread out on the two nodes.
> Rather, in the example above, 4 MPI processes with 4 OpenMP threads each
> runs on the first node, and the second node does nothing.
Did you provide a hostfile / machinefile containing the names of your
nodes you want the MPI processes to be started on?

Carsten

> 
> Any hints would be most appreciated,
> Cheers,
> Alex
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