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# Execution

The program compiled for one processor can be started from a command line:

`md < md.in > md.out`

where `md.in` is the main input file and `md.out` is output. Names of input and output files may be arbitrary

In the case of parallel execution, the input file must be always called `md.input`. The program starts for example as:

`mpirun -np 4 mdp > md.out`

where number of processes is 4 and `md.out` is name of the output file. Other arguments for `mpirun` command can be given. Often `mpirun` can be invoked only from a queue batch script, see the rules in your computer center. Sometimes command `poe` is used to start a parallel program

Subsections

- Files used by the program
- Memory considerations
- Program structure