PETSc Error

[DevasmitDutta]

Hi, I am operating on macOS Monterey, version 12.5.1, and i am facing an issue when i try to run code using GridapPETSc, below is the error in stack-trace

PETSc Error --- Application was linked against both OpenMPI and MPICH based MPI libraries 
and will not run correctly

After i got this error, i have un-installed MPICH from my machine, and currently only have OPEN-MPI, but still it shows having linked with multiple MPI implementation.

[JordiManyer]

Hi,
It's hard to asses the problem with such a limited information, but I think your problem might be that the library that MPI.jl is using is different to the mpi library used to compile PETSc.
First, I would advise you to read the MPI.jl configuration manual.

Also, if you are using GridapPETSc.jl I would suggest you

1. Set your MPI.jl package to use your system mpi library.
2. Dowload and compile PETSc locally using the same mpi library. This CI script contains bash instructions to do so.
3. Rebuild both the artifacts in your project by running

julia --project=. -e `using Pkg; Pkg.build()` 

Hopefully this solves your issue.