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titlePrerequisites

 You should have completed:

  • Installation of data files
  • Successful compilation of OpenIFS.

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 to verify the model before any development or production is started. These short tests are also a good way to become familiar with the model.

  • Single task / single thread.
  • 2 x OpenMP threads
  • 2 x MPI tasks
  • 2 x threads + 2 tasks.
  • Acceptance (reference) tests.

These are described below.


 
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a) Build the model in the oifs/make directory. Use the optimized ('opt') build configuration. If you find these tests do not work with this configuration, use the 'noopt' configuration and then experiment by raising the optimization level.
    Copy the model executable, master.exe, from the make directory 'make/gnu-opt/bin/master.exe' to the t21job directory.

b) In directory oifs/t21test  edit the file 'job' to change the line beginning:

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Code Block
% cp namelists fort.4
% ./job -e epc8 -x ./master.exe

The model will expect to find a file called fort.4 in the same directory as the executable. This script copies the executable from oifs/make/build/bin.

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This test runs only 6 timesteps.

If the job command can't find the model executable, make sure you have copied the master.exe file from the 'make/gnu-opt/bin' directory to the t21test directory.

Model output

The model writes its output to a several files.

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The model should not be run for long because this test relies on a linear growth of errors. A 12 hour run is generally recommended, particularly at higher resolutions. 


Any questions/problems please contact openifs-support@ecmwf.int.

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Credits
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