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b) cp oifs/t21test and edit the file 'job' to 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.

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signal_drhook(SIGSYS=31): New handler installed at 0x4d06cf; old preserved at 0x0
MPL_BUFFER_METHOD:  2           0
GRIB_API ERROR   :  Unable to locate sample file gg_sfc_grib1.tmpl
                    in /home/rd/openifs/software/grib_api/1.9.18/grib_api-gcc-4.5.0/ifs_samples/grib1_mlgrib2
 GRIB_NEW_FROM_TEMPLATE gg_sfc_grib1 FAILED          -2

c) Copy the namelists and run the model with a single task and single thread by executing the job script:

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NODE_001.01 contains the text output (WRITE/PRINT statements). The numbers refer to task number and thread number. Only output from the master task & thread is normally output but this can be changed for debugging purposes.

ICM*epc8+0000 is the model output in GRIB format split into 2 files; one for the gridpoint, the other for spectral fields. This contains only a few output variables in this test. This file is a mix of GRIB1 and GRIB2 messages. See the Documentation for how to process this output.

ifs.stat is a small file that prints the model steps, time taken for each step and a 'norm' measure. This file can be usually ignored but is useful for debugging.

Likely errors

The model will fail with an error if it cannot find the 'ifs_samples' directory in the grib_api installation:

signal_drhook(SIGSYS=31): New handler installed at 0x4d06cf; old preserved at 0x0
MPL_BUFFER_METHOD:  2           0
GRIB_API ERROR   :  Unable to locate sample file gg_sfc_grib1.tmpl
                    in /home/rd/openifs/software/grib_api/1.9.18/grib_api-gcc-4.5.0/ifs_samples/grib1_mlgrib2
 GRIB_NEW_FROM_TEMPLATE gg_sfc_grib1 FAILED          -2

If you see an error like this:

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