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Login to Euler
```
$ ssh username@euler.ethz.ch
```
Load modules
```
$ env2lmod
$ module load gcc/6.3.0 openmpi/4.0.2 r/4.0.2
```
To test, request 5 processors. MPI_UNIVERSE_SIZE is checked inside the R script for how many processors are available. One processor is to be the master and others for calculation.