[petsc-users] Error "Attempting to use an MPI routine before initializing MPICH" after compiling PETSc with Intel MPI and GCC

[Roland Richter]

Hei,

I compiled PETSc with Intel MPI (MPICH) and GCC as compiler (i.e. using
Intel OneAPI together with the supplied mpicxx-compiler). Compilation
and installation worked fine, but running the tests resulted in the
error "Attempting to use an MPI routine before initializing MPICH". A
simple test program (attached) worked fine with the same combination.

What could be the reason for that?

Thanks!

Regards,

Roland Richter
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