[petsc-users] Scalability problem using PETSc with local installed OpenMPI

[Gong Yujie]

Dear PETSc developers,

I installed OpenMPI3 first and then installed PETSc with that mpi. Currently, I'm facing a scalability issue, in detail, I tested that using OpenMPI to calculate an addition of two distributed arrays and I get a good scalability. The problem is when I calculate the addition of two vectors in PETSc, I don't have any scalability. For the same size of the problem, PETSc costs a lot much time than merely using OpenMPI.

My PETSc version is 3.16.0 and the version of OpenMPI is 3.1.4. Hope you can give me some suggestions.

Best Regards,
Yujie
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