Hi,

I have tried to simulate a protein in water with the CHARMM27 force field and 
the GROMACS simulation package. Without the CMAP correction the simulation runs 
just fine, but when adding the CMAP correction to the dihedrals, the protein 
quickly starts to unfold and the simulation stops (with no error message in log 
or supercomputer's output file). I'm running my simulations on a supercomputer 
with 64 processors and I'm using mdrun_mpi. When running on my desktop with 
four cores I have no problems. Could it be that the current mpi version of 
mdrun in the supercomputer is the reason for this, or is the CMAP correction 
unavailable for parallel simulations using the mpi as in the case of GPUs when 
using an implicit solvent model?

Best regards,
Artturi Koivuniemi

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