Hi Hongtao, ARPACK will not run in parallel. In the parallel you can only use ModifiedArnoldi. If you need ARPACK, than you can have the build with MPI On, but you need to run the solver in serial. Stan <http://www.pw.edu.pl/> On 10.05.2024 13:54, Sherwin, Spencer J wrote:
HI Hongtao,
You can compile Nektar++ without the NEKTAR_USE_MPI flag, or go into ccmake from your builds directory and toggle off NEKTAR_USE_MPI, reconfigure and this should then generate a configuration wtihouth mpi.
Alternatively you can try running “ModifiedArnoldi” instead of Arpack. I think that does run in parallel.
Cheers,
Spencer.
*From: *nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of 🌸那慢慢🌸<2644878715@qq.com> *Date: *Friday, 10 May 2024 at 12:37 *To: *nektar-users <nektar-users@imperial.ac.uk> *Subject: *[Nektar-users] ARPACK is not set-up for parallel execution
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Dear nektar++ users and developers,
I get the error "ARPACK is not set-up for parallel execution" when running the incompressbile flow solver in parallel with MPI，but in the file build/CMakeCache.tst have a line saying:NEKTAR_USE_MPI:BOOL=ON.How do I fix this?
Hongtao Cheng
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