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randyk
Ansys Employee

Issue identified as the following environment variables have been set (externally):
BLIS_NUM_THREADS
MKL_NUM_THREADS
OMP_NUM_THREADS
OMP_PLACES
OMP_PROC_BIND
OPENBLAS_NUM_THREADS

These affect not only the core pinning by MPI, but also the number of threads the solvers use.

Depending on the system and design, we set their value internally, but typically do not override them if the user has set them externally.