Command to run a replica exchange using GROMACS with MPI on my pc or how to set mpi?

User discussions
1

GROMACS version:2021.5
GROMACS modification: yes
I am trying to run repilca exchange md simulation on my PC using this command " mpirun -np 4 gmx_mpi mdrun -v -deffnm remd -multi 4 -replex 100" and I am getting this error, mpirun was unable to find the specified executable file, and therefore
did not launch the job. This error was first reported for process
rank 0; it may have occurred for other processes as well.

NOTE: A common cause for this error is misspelling a mpirun command
line parameter option (remember that mpirun interprets the first
unrecognized command line token as the executable).

Node: itd2338-B460MD3H
Executable: gmx_mpi

4 total processes failed to start

2

here is no file/folder named remd, so you need to provide the correct name.