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Reply To: Implementing the Cumulant Collision Operator

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› Forums › OpenLB › General Topics › Implementing the Cumulant Collision Operator › Reply To: Implementing the Cumulant Collision Operator

August 19, 2025 at 9:02 pm #10670
jmctighe
Participant

Perhaps there is something wrong on my end then… When running the simulation with the same descriptor, collision operator, and wall-model parameters as in the provided channel3d example, the performance is about 390 MLUPs before starting the SuperLatticeTimeAveraged3D calculations (performed using .addEnsemble()). Once the calculations begin, the performance dramatically drops to under 2.5 MLUPs, the volatile GPU utilization goes to zero on average for both GPUs, and the CPU utilization goes to 100% for the two CPUs in use.

Could this be at all related to the compilation configuration? I can provide the contents of my config.mk file and the simulation setup if you would like.

  • This reply was modified 3 months, 2 weeks ago by jmctighe. Reason: typo