[petsc-dev] petsc4py, numpy's BLAS and PETSc's BLAS

[Barry Smith]

  When PETSc is built with petsc4py this brings along, in some way, the BLAS/LAPACK that numpy is using. Yet PETSc is free to bring in its own BLAS/LAPACK libraries. 

  To be completely proper should we be having configure (when used with petsc4py) determine the BLAS/LAPACK that numpy is using and only using that for PETSc's BLAS/LAPACK needs?  If not, why is ok to have both sets hanging around? Jose's new https://gitlab.com/petsc/petsc/-/merge_requests/5737 seems to indicate possible problems with having both.

  Barry