OS Upgrade to SLES 15.7


MAIN CHANGE

 As of the operating system of Phase 1 (CPU) has been upgraded one last time from SLES 15SP3 to SLES 15SP7.

This involves a number of changes:

Software Stack

We have rolled out a new default software stack 24.6.0 built against on Intel OneAPI 25.3.1 and gcc 15.X. Packages are similar to the stack 24.5.0 available on Phase 2 (GPU) and the TIER2 CoolMUC cluster. Note that no default intel modules are loaded.

:~> module list
Currently Loaded Modulefiles:
 1) stack/24.6.0{arch=auto}


You can load individual packages or the whole toolkit, e.g.

:~> module load intel-toolkit
Loading intel-toolkit/2025.3.0
  Loading requirement: intel/2025.3.0 intel-mpi/2021.17.0 intel-mkl/2025.3.0 intel-inspector/2024.1.0 intel-dnn/2025.3.0 intel-itac/2022.4.0
    intel-tbb/2022.3.0 intel-ipp/2022.3.0 intel-dal/2025.6.0 intel-ippcp/2025.3.0 intel-dpl/2022.10.0 intel-dpct/2025.3.0

The Intel OneAPI packages use the new llvm  based compilers icx  and ifx . If you still want to use icc , icpc , and ifort please use: module load intel-legacy-compilers .

Intel Developers Workshop

Please note our upcoming 

Intel Developer Workshop

which will adress changes and a path for porting software to the new compilers.


You can also switch back to the old default stack by running

:~> module switch stack/22.2.1
intel-mpi: using intel wrappers for mpicc, mpif77, etc

Switching from stack/24.6.0{arch=auto} to stack/22.2.1{arch=auto}
  Loading requirement: intel-oneapi-compilers/2021.4.0 intel-mkl/2020 intel-mpi/2019-intel

which autoloads the old intel default modules. We expect software of the old stack to still run, but we cannot guarantee it.

SLURM

A new SLURM version (25.11.2) was installed. Since old queued jobs could not be imported, you will have to requeue your jobs. New jobids start from 5 500 000.

Due to some hardware issues we are missing two islands, which should be back in operation as soon as necessary spare parts arrive. 


netcdf-hdf5-all

The netcdf-hdf5-all module was deprecated in stack/24.5.0. It is now totally removed.

The module bundles a couple of IO software: netcdf, hdf5, parallel-hdf5; we have now unbundled it. This module is no longer available in stack/24.6.0.

Users can now control which of these modules are loaded. Whenever possible, we recommend moving to more recent versions, though we maintain a few old versions.

Note: the current versions use the latest intel-toolkit/2025.3.0 rather than the old intel-toolkit/2021. Please also see our Documentation for NetCDF and PnetCDF for further details.



Other

  • Operating System of SuperMUC-NG Phase-1 has been upgraded to SLES 15.7, as a side affect of this change, all modules of Ansys products, including:
    LSDyna, Ansys, Fluent, CFX, Rocky, ICEM and Lumerical are unavailable. We inform you as soon as the issue are fixed.
  • The default CPU frequency has been reduced from 2.3 GHz to 1.9 GHz. Accordingly, the maximum walltimes of the queus have been increased to 

    60h for the fat, general, and micro queues and to 30 h for the large queue.

  • We ran into a problem with the SLURM licensing mechanism in the newly installed version. We are looking into it. Please cancel jobs that are pending due to licenses and resubmit them without 
    #SBATCH –licenses=scratch:0


List of software modules not currently available:


  • python/3.14.3-extended: please use "python/3.14.3-base", it provides "pip", so you can install more software.