Hello Spencer,

Thank you for that piece of information. I requested a newer version of FFTW since it has been optimised for AVX,AVX2 instruction sets but I don't know what fraction of computing time it typically represents in a quasi-3D Nektar++ run. Anyway, good to know

Have a nice day,

Thibaut

On 17/01/2020 17:09, Sherwin, Spencer J wrote:
Hi Thibaut,

Although  this blog was originally written a while ago we have been updating the information as the system has been updated and so it is good that the instructions still work. I am not sure we have tried playing with the compiler flags however so I am not aware of any other options to improve the efficiency of the compiled code.

Best regards,
Spencer.


On 17 Jan 2020, at 13:21, Thibaut Appel <t.appel17@imperial.ac.uk> wrote:

Hello,

I was just wondering how people compile Nektar++ from source on the IC cluster these days and if there are any recommended adjustments compared with that this link says https://www.nektar.info/nektar-cx1/

It is 4 years old but the instructions still work, it seems I'm able to compile Nektar++ with 

module load mpi/intel-2019.6.166
module load intel-suite/2017.6
module load fftw/3.3.3-double
module load flex/2.6.4
module load scotch/6.0.4
module load boost/1.66.0

CC=mpicc CXX=mpicxx cmake -DNEKTAR_USE_FFTW=ON -DNEKTAR_USE_MKL=ON DNEKTAR_USE_MPI=ON -DNEKTAR_USE_SYSTEM_BLAS_LAPACK=OFF -DNEKTAR_TEST_FORCEMPIEXEC=ON -DCMAKE_CXX_FLAGS="-std=c++11 -O3 -xSSE4.2 -axAVX,CORE-AVX-I,CORE-AVX2" -DCMAKE_C_FLAGS="-O3 -xSSE4.2 -axAVX,CORE-AVX-I,CORE-AVX2" ..

Would you recommend any change with respect to newer packages or better practice for efficiency?

Thanks for the support,


Thibaut

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Spencer Sherwin FREng, FRAeS
Head of Aerodynamics Section,
Director of Research Computing Service,
Professor of Computational Fluid Mechanics,
Department of Aeronautics,
s.sherwin@imperial.ac.uk                                   South Kensington Campus,
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http://www.imperial.ac.uk/people/s.sherwin/