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Introduction

The OpenIFS tarfile distribution includes a simple low resolution (T21) test job that can be used to verify the model is working correctly in the directory: oifs/t21test. It is strongly recommended that after compiling the model successfully, these short tests are run.

Directory t21test contents

The directory t21test contains a number of files:

% ls t21test
ICMGGepc8      ICMGGepc8INIUA  ICMSHepc8INIT  ifsdata  namelists     ref_021_0018
ICMGGepc8INIT  ICMSHepc8       README         job      ref_021_0006  ref_021_0144

Files beginning with 'ICM'.
These are the input files for this T21 experiment. They are in GRIB format. Do not move them from this directory. OpenIFS expects to find it's input files in the same directory as the main executable.

epc8 - this is the Experiment ID.
ICMGGepc8 - 'GG' indicates these contain gridpoint fields.
ICMSHepc8 - 'SH' indicates these contains spherical harmonic fields.

You can use the 'grib_ls' and 'grib_dump' commands to see the contents of these files (grib_ls/dump will be in your grib_api directory).

job
Simple shell script to run the model. Described in more detail below.

ifsdata
Climate data fields used for T21 test integration. You should not move or rename this directory as the model will expect to find the climate files it needs in a directory of this name.

namelists
This file contains all of the input model fortran NAMELISTS. Not all of the namelists have their variables listed, only the variables commonly changed are listed here. Users should copy this file and modify it for the tests described below.

ref_021_*
These files are reference output for the model tests. The model can be run in 'reference' mode where it checks it is working correctly by comparing some mathematical norms against these files. Reference runs are described in more detail under 'Acceptance testing' below.

Test integrations - sequential and parallel testing

A number of short model runs are recommended to verify the model is working correctly. Once you have compiled the model without errors, follow these steps.

These tests will ensure the model can run with multiple OpenMP threads, with MPI tasks and in mixed OpenMP/MPI mode. A further acceptance test can be run which compares the model output on your machine with reference data obtained from machines at ECMWF.

  1. Edit 'job' and change the line beginning:
    export GRIB_SAMPLES_PATH=...
    to match the location of your grib_api installation.  The model will fail with an error if it cannot find the 'ifs_samples' directory in the grib_api installation.

Acceptance testing - comparing reference output

 

 

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