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The model can also be set to use NPROC=2 and OMP_NUM_THREADS=2 to use a total of 4 processes. However, this would require a computer with at least 4 cores to see any benefit and is not beneficial on the virtual machine.
Acceptance testing
The final step is to check the model is producing the numerical answers within acceptable limits, even if it runs the short tests above without failing. OpenIFS includes code that will compute internal statistical norms and compare against numbers supplied by ECMWF. The file: ref_021_0144 in the t21test directory contains statistical norms computed by the model run at ECMWF.
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To do the acceptance test, edit the namelists in
change the number of timesteps to 144 72 to run the model for 1 day 12 hours (assuming you have not changed the default timestep of 10mins at T21) and set the LREFOUT to TRUE:
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With LREFOUT=true, at the last timestep OpenIFS will read the ref_021_0144 file and produce a new file: res_021_0144 (note the similar filenames!). The contents of the file should be similar to:
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