Dear Neks,

I'm using Nek5000 to simulate turbulent Rayleigh-Benard convection, which is governed by the coupled Navier-Stokes equations and convective heat equation. I'm running the code on a supercomputer, Tianhe-2, located in Guangzhou, China. Each computer node in Tianhe-2 has 24 cores (2 Xeon E5 12-core CPUs) and 64GB memory. I find the speedup curve is not linear on a single node. For example, a 24-task job is only 8 times faster than the serial one. However, the performance with an increasing number of nodes is quite good. I don't know whether there is any parameter in nek500 that I can change in order to improve the speedup performance of the individual nodes.

Thanks in advance!

 

Best regards,

Wei XU