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- cd oifs/make and build the model using the 'opt' build configuration.
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.Code Block 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- cp namelists fort.4
The model will look for a file 'fort.4' to read its fortran namelists from. Run the model with a single task and single thread by executing the job script:
./job
If the run works you will see output like this:Code Block ... signal_drhook(SIGSYS=31): New handler installed at 0x4d06cf; old preserved at 0x0 MPL_BUFFER_METHOD: 2 0 16:03:46 STEP 0 H= 0:00 +CPU= 3.598 16:03:46 STEP 1 H= 0:10 +CPU= 0.535 16:03:47 STEP 2 H= 0:20 +CPU= 0.537 16:03:48 STEP 3 H= 0:30 +CPU= 0.537 16:03:48 STEP 4 H= 0:40 +CPU= 0.527 16:03:49 STEP 5 H= 0:50 +CPU= 0.526 16:03:49 STEP 6 H= 1:00 +CPU= 0.530This test runs only 6 timesteps. The model writes its output to a several files. The NODE_00
If you see an error like this:
Code Block mpirun noticed that job rank 0 with PID 7429 on node elvira exited on signal 11 (Segmentation fault).
or
Code Block MEMORY FAULT
it is most likely because OpenIFS requries more 'stack' memory than your default setting. Sometimes, this can happen when increasing the number of OpenMP threads.
To solve the problem add the line:
Code Block ulimit -s unlimited
to the file job just before the mpirun line. This will increase the per-process stack memory limit to the maximum the operating system allows.
If the model still fails, contact openifs-support@ecmwf.int for assistance.
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