Reply To: Optimum No of Cores For Fluent?

[ai0013]

To add:
How are these 64 cores distributed? Sometimes depending on the architecture, e.g. having 2 sockets with 32 cores each can perform poorer compared to running with 1 socket. This is because the sockets need time to communicate with each other. Is that your case? Also depending on the grid partition some cores might finish their calculation before others, so they need to wait for them.

There other factors to consider in performance tests, I believe finding the optimum # cores is case-dependent.