sorry my english..

I want to know how can I run  Gromancs in parallel!
Because when I used  

mdrun &
mpiexec -np 4 mdrun_mpi -v -deffnm em

 to run the minimization in 4 cores > all cores make the same job, again!
They don't run together.  
I want all in parallel make the job faster.


what could be wrong?

thank's a lot!

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