[Pw_forum] why pw.x runs at similar speed using 8 cores or 16 cores

[Shaofeng Wang]

Dear all,

I got a server computer equipped with two 8 core cpus. I installed intel fortran compiler (12.1) and openmpi (1.6.5). No errors took place during installation. Then I compiled parallel quantum esspresso (5.2.0) and the program run correctly. However, I found pw.x  runs at very similar speed with 8 cores or 16 cores. Could any expert show me how to improve the calculation speed?

The make.sys file is attached.

Thanks in advance.

Shaofeng
--------------------------------------
Shaofeng Wang, Ph.D of Geochemistry
Environmental Molecular Science Group
Institute of Applied Ecology, Chinese Academy of Sciences
Shenyang, 110016, China
wangshaofeng at iae.ac.cn
www.iae.cas.cn

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