I'm new in this field and I'm helping a colleague to run this model in the cloud. I have created a ubuntu Virtual Machine (VM) and I've followed the steps described here to install and configure all the software.

In a previous VM everything works fine. When we run:

mpirun -np 4 wrf.exe

the output was:

starting wrf task 0 of 4

starting wrf task 1 of 4

starting wrf task 3 of 4

starting wrf task 2 of 4

but int the new VM the same command produces:

starting wrf task 0 of 1

starting wrf task 0 of 1

starting wrf task 0 of 1

starting wrf task 0 of 1

As I mentioned before, I have not much experience. I've tried to see the output files like rsl.error.0000 but I did not find any hints.

Could you suggest me where am I wrong?

The VM that I used has 16 VCPUs.

Thanks,

Massimo