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- have learnt about how OpenIFS is installed and organised,
- have run it at T21 resolution and know how to run it serially (1 process) and in parallel with both MPI & OpenMP,
- know how to use grib tools to look at model output.
Connecting to the ECMWF HPC Facilities
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On the ECMWF HPCF an interactive session will last for 48 hrs by default, unless the walltime is specified using an additional directive.
OpenIFS directories
In this section we:
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- OpenIFS has been precompiled on the HPCF.
- All source code has been removed due to licensing restrictions.
- OpenIFS builds 'out-of-source'; this means object (
.o) files and executables (binary files) are not mixed with the source code. - The
READMEfile contains information about software requirements, setting up the local compilation environment, and where to get help and support.
OpenIFS T21 test forecasts
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The model can also be set to use NPROC=2 and NTHREADS=2 to use a total of 4 processes. However, this would require a computer with at least 4 cores.
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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As long as the model reports 'calculations are correct' and the error is less than a few percent then the model is behaving satisfactorily in your compilation and run environment.
How to control model output
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In this example, the model will write 3 separate output files at the first timestep (0hrs), 3hrs and 9hrs and then no more regardless of how long the model runs for.
How to change the output variables and post-processing
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