Reply To: Fluent fails with Intel MPI protocol on 2 nodes

[dv.makarov]

Hello Mangesh,

My colleague performed some tests together with HPC team and was able to run on two nodes ANSYS 2024R2. Environment variable was set as instructed:
      > export I_MPI_HYDRA_BOOTSTRAP=ssh
Then Fluent was started via batch file using with fluent command: 
      > fluent 3ddp -g -t$SLURM_NTASKS -pib -cnf=hosts_cpus_list -i task.jou

Fluent run with Intel MPI using both nodes (each having 128 cores). However, performance was only 27% faster compared to a single node - would this performance boost value be typical or expected? The case file uses 2.5M CVs mesh, includes LES turbulence modelling, non-reacting species transport, two-phase flow.
Thank you!

Yours,
Dmitriy