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?