Lito Yap
Ansys Employee
Please try (shown using default path for Lumerical 2021 R1) /opt/lumerical/v211/mpich2/nemesis/bin/mpiexec -n 8 /opt/lumerical/v211/bin/varfdtd-engine-mpich2nem -t -fullinfo simulationfile.lms
The above runs the simulation job with the bundled MPICH2 using 8 processes. See this article in our KB for details.
Best Lito