Eiger¶

Eiger is an Alps cluster that provides compute nodes and file systems designed to meet the needs of CPU-only workloads for the HPC Platform. For more information, please refer to the CSCS Documentation .

C2SM only provides partial support for Eiger. Nevertheless, below you can find instructions on how to set up ICON on Eiger.

Setting Up ICON with Spack on Eiger¶

1. Pull and Start the Environment¶

uenv image pull prgenv-gnu/24.11:v1
uenv start --view=spack prgenv-gnu/24.11:v1

2. Clone and Setup Spack¶

git clone -b releases/v0.23 https://github.com/spack/spack
source spack/share/spack/setup-env.sh

Set spack system config path:

export SPACK_SYSTEM_CONFIG_PATH=/user-environment/config/

3. Modify Compiler Flags for ICON¶

Edit the file: spack/var/spack/repos/builtin/packages/icon/package.pypackages.py

Add the following under the line if self.compiler.name == "gcc"::

flags["LDFLAGS"].append("-Wl,--copy-dt-needed-entries")
flags["ICON_FCFLAGS"].append("-fallow-argument-mismatch")
flags["ICON_OCEAN_FCFLAGS"].extend([
    "-O3",
    "-fno-tree-loop-vectorize",
    "-fallow-argument-mismatch"
])

4. Create and Configure Spack Environment for ICON¶

spack env create my-icon

Modify the spack.yaml file in your my-icon environment. Example:

# This is a Spack Environment file.
#
# It describes a set of packages to be installed, along with
# configuration settings.
spack:
  specs:
  - icon+art+rte-rrtmgp+grib2 -ocean ~coupling
  view: true
  concretizer:
    unify: true
  develop:
    icon:
      spec: icon +rte-rrtmgp +art +grib2 -ocean ~coupling
      path: /capstor/store/cscs/empa/em05/ckeller/icon-kit
  compilers:
  - compiler:
      spec: gcc@=7.5.0
      paths:
        cc: /usr/bin/gcc
        cxx: /usr/bin/g++
        f77: /usr/bin/gfortran
        fc: /usr/bin/gfortran
      flags: {}
      operating_system: sles15
      target: x86_64
      modules: []
      environment: {}
      extra_rpaths: []
  - compiler:
      spec: gcc@=12.3.0
      paths:
        cc: /usr/bin/gcc-12
        cxx: /usr/bin/g++-12
        f77: /usr/bin/gfortran-12
        fc: /usr/bin/gfortran-12
      flags: {}
      operating_system: sles15
      target: x86_64
      modules: []
      environment: {}
      extra_rpaths: []

Path to ICON code

Ensure develop.icon.path points to your local ICON source code.

5. Activate the Environment¶

spack env activate path/to/my-icon

6. Concretize and Install Packages¶

spack concretize
spack install

concretize resolves dependencies, and install builds the packages.