I installed Spack package of Dealii on a machine with 32 cores (48 virtual 
cores) and ran a petsc-parallel code. If I run using only one MPI process, 
then I only get one core running for the solver part. Shouldn't it use all 
the available cores within a node?  I think its installed with MPI only 
support, right? Can I use hybrid MPI-OPENMPI parallelization with PetSc 
installed using Spack?

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