[kiteguy]

Hello all,

I recently ran some benchmark tests with Star-CCM+ on my departments workstation and noticed that the parallel efficiency scales painfully bad with the number of cores (see the attached specifications and benchmark results).

I have read in other posts that the Threadripper lineup is not ideal for CFD-purposes due to the relatively small number of available memory lanes (4). Does this however explain why the parallel efficiency drops to as little as 65% with 8 cores already?

I would really appreciate any suggestions on how to find and possibly fix the bottle-neck in the set-up.

Best regards!

Attachments:
- Screenshot of representative benchmark test with Star-CCM+
- Workstation specifications

CPU: AMD Ryzen Threadripper 3990X 64-Core Processor
mem: Corsair Vengeance LPX, DDR4-3200, CL16 - 64 GB Dual Kit (128GB total)
graphics: Gigabyte GeForce GTX 1660 Ti OC 6G, 6144MB GDDR6
SSD: Gigabyte Aorus NVMe SSD, PCIe 4.0 M.2 Type 2280