[Nek5000-users] Parallel speedup on supercomputer Tianhe-2

[nek5000-users at lists.mcs.anl.gov]

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

----------
Wei XU
Ph.D. Candidate
Nano Science and Technology Program
The Hong Kong University of Science and Technology
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