SeisSol can be tuned with several environment variables:
Some environment variables related to checkpointing are described in the Checkpointing section.
Optimal environment variables on SuperMUC-NG
On SuperMUC-NG, we recommend using SeisSol with async output in thread mode.
That is SeisSol should be compiled with
-DCOMMTHREAD=ON, and then run with the environment variables proposed below.
Also, we recommend using hyperthreading capabilities (that is using 96 CPUs instead of 48. 2 threads out of 96 are used as communication threads).
Here are some proposed environment variables, to be added prior to invoking SeisSol in your batch file:
export MP_SINGLE_THREAD=no unset KMP_AFFINITY export OMP_NUM_THREADS=94 export OMP_PLACES="cores(47)" export XDMFWRITER_ALIGNMENT=8388608 export XDMFWRITER_BLOCK_SIZE=8388608 export SC_CHECKPOINT_ALIGNMENT=8388608 export SEISSOL_CHECKPOINT_ALIGNMENT=8388608 export SEISSOL_CHECKPOINT_DIRECT=1 export ASYNC_MODE=THREAD export ASYNC_BUFFER_ALIGNMENT=8388608
A complete batch script for SuperMUC-NG can be found in the chapter about SuperMUC-NG.