My Community

Posted: **Wed Jun 10, 2015 8:06 am**

Dear all,
I have compiled the VASP.5.3.5 on our HPC with Intel Fortran , Intel MPI and Intel MKL on Intel Core. Then test the parallel efficiency, the result is:

Code: Select all

Node	      1  	2	  3	   4	   5	   6	    7	   8
CPU 	      8 	16	  24	  32  	40	  48  	56	  64
Time(s)	3063.8 1689.1 1219.0 967.1 810.8   832.3  651.5  589.5
Speed-up 	 1	1.81	2.51	3.17	3.78	3.68	4.70	5.20
Efficiency	1	0.91	0.84	0.79	0.76	0.61	0.67	0.65

Speed-up=Time/3063.8
Efficiency= Speed-up/ Node

The simulation system contains 112 atoms.
You can find the efficiency is lower than 80% when the nodes reaches 4, and decrease to 65% on 8 nodes. I want to know whether it is normal or not ?
Any suggestion will be appreciated.

Posted: **Wed Jun 10, 2015 11:57 am**

The efficiency can be modified by parameters for regulation of parallelisation (NPAR, NCORE).
Make a variation of these parameters consistent with your system (number of orbitals, k-points...)

Posted: **Thu Jun 11, 2015 4:35 pm**

admin wrote:The efficiency can be modified by parameters for regulation of parallelisation (NPAR, NCORE).
Make a variation of these parameters consistent with your system (number of orbitals, k-points...)

Thank you very much! it would be help, i will try it.

My Community

Parallel performance of VASP

Parallel performance of VASP

Re: Parallel performance of VASP

Re: Parallel performance of VASP