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On the ECMWF hpc2020, running the model script interactively should be fine for lower grid resolutions up to T255L91.
In If the LAUNCH variable in exp-config.h remains the LAUNCH variable should remain empty (and no --runcmd parameter is should be provided in the command line) then the . The oifs-run script will use its default launch parameters: srun -c${OIFS_NPROC} --mem=64GB --time=60 which will work fine for OIFS_NPROC=4 or 8 with experiment i4xc.
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