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Overview

SeisSol is a software package for simulating elastic wave propagation and dynamic rupture based on the arbitrary high-order accurate derivative discontinuous Galerkin method (ADER-DG). SeisSol can use (an)isotropic elastic, viscoelastic and viscoplastic material to approximate realistic geological subsurface properties.

Website: https://seissol.org/

Documentation: https://seissol.readthedocs.io/en/latest/

Build

Building SeisSol

The list of necessary dependencies to install and compile can be found under https://seissol.readthedocs.io/en/latest/compiling-seissol.html (TODO: The installation in the home directory, as described there, is outdated. We suggest setting an environment variable SEISSOL_PREFIX to a local location and then setting -DCMAKE_INSTALL_PREFIX=$SEISSOL_PREFIX in CMake for all the dependencies installation.). In particular, you will need to install:

For GPUs, you will also need:

Alternatively, we provide a Spack environment under https://github.com/SeisSol/seissol-spack-aid .

For SeisSol itself, you will need to set the architecture you will use—since our matrix kernel generators usually require that information. That can be done via the HOST_ARCH parameter. On x86 architectures without AVX512 support, choose hsw , rome , or milan as host architecture. With AVX512 support, choose skx or bergamo . On ARM machines, we have the dummy targets neon , sve128 , sve256 , and sve512 , respectively. Setting these will enable the instruction generation for the respective SIMD architecture instructions. You should also set your CPU using the -mcpu parameter.

You will also need to set the DEVICE_ARCH and DEVICE_BACKEND parameters for GPUs.

Testing Your Installation

Once the build is finished, you will obtain two binaries:

  • SeisSol_Release_ARCH

  • SeisSol_proxy_Release_ARCH

To test your installation, you can do so within two steps:

  • Run SeisSol_proxy_Release_ARCH 100000 100 all . This command will give you an idealized performance figure and run through all kernels once.

  • Run SeisSol_Release_ARCH with a parameter file. We provide reference values for all scenarios in the https://github.com/SeisSol/precomputed-seissol repository, which you could use to test your installation.

Pinning and Performance Considerations

For optimal performance, we recommend using one process per NUMA domain. If you use the GPU version, you will need one process per GPU.

Furthermore, we recommend keeping one CPU core free per process for the so-called communication thread. It will be used to advance MPI communication and I/O instead. To do so, you will need to set some environment variables, similar to the following snippet:

SEISSOL_COMMTHREAD=1
THREADS_PER_TASK=16 # Guidance, but you can change this parameter
CPU_HYPERTHREADING=1 
NUM_CORES=$(expr $CPUS_PER_TASK / $CPU_HYPERTHREADING)
NUM_COMPUTE_CORES=$(expr $NUM_CORES - $SEISSOL_COMMTHREAD)
export OMP_NUM_THREADS="$(expr $NUM_COMPUTE_CORES \* $CPU_HYPERTHREADING)"
export OMP_PLACES="cores($NUM_COMPUTE_CORES)"
export PROC_BIND=spread
export MP_SINGLE_THREAD=no
unset KMP_AFFINITY

Alternatively, you can disable the communication thread by setting SEISSOL_COMMTHREAD=0 in case you have issues, but it’s not recommended.

Tasks and Submissions

  1. Run the application on 4 CPU nodes and submit the results

  1. Run MPI Profiler to profile the application. Which 3 MPI calls are mostly used? present your work in the team interview ppt slides

  1. Visualize the results, and create a short video demonstrating the input via Paraview or any other tool.

  1. <TBD>

  1. <TBD> …

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