How to invoke all processors?

[WeatherHound]

I know that mpirun -np is the number of processes being run simultaneously not cores

But I want to use all my physical cores to speed up the model run.

How do I do this

 

[kwerner]

Hi,
I assume when you say "cores," maybe you mean "nodes?" Either way, you will need to know how many are available on your system, and then just set the number of processors to that value (number of available nodes x number of processors/cores on each node). However, that being said, please take a look at this FAQ, which discusses the upper limit of the number of processors you can use for a simulation.