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Two complexes, AB and AD, have already been through the update, and the last complex AA will follow is expected to be upgraded last to 8.8, about a few days week after AC.
The update itself should be completely harmless and transparent in most cases, except for those using the vendor provided OpenMPI, typically loaded via module load openmpi. On the updated OS image the default version of vendor-provided, vendor-supported OpenMPI changes from 4.1.1.1 to 4.1.5.4.
To facilitate the transition, we have backported OpenMPI 4.1.1.1 and basic tests with it on the new OS have been successful. However, since it is not officially supported, you may use it at your own responsibility, and it may not be possible to fix any problems you may encounter; even so, if you find any issues trying to run with OpenMPI 4.1.1.1, for our awareness please let us know by reporting this to service desk.through https://support.ecmwf.int/
We strongly recommend to switch to fully supported alternatives with either module load hpcx-openmpi, the MPI version used in the operational production at ECMWF, or the vendor-provided and supported version referenced by module load openmpi.
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- Login to ad-login instead of hpc-login and submit your tests jobs from there
- If submitting jobs remotely, use ad-batch instead of hpc-batch.
- If using troika for remote submission of tasks from ecFlow, temporarily replace "hpc" by "ad" as your target.
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Once the tests are done, please restore your target host to the original value.
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