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Alternative PETSc builds for petsc4py
=====================================
petsc4py is available for python3 with support for
real numbers (python3-petsc4py-real)
and complex numbers (python3-petsc4py-complex).
Either build is accessible at runtime. By default petsc4py uses the
default PETSc build set in /usr/lib/petsc (which can be selected with
"update-alternatives --config petsc")
Other PETSc builds can be selected at runtime setting (or exporting)
the PETSC_DIR environment variable.
Examples include:
PETSC_DIR=/usr/lib/petscdir/petsc-real
selects the preferred real-number version of PETSc (by default the
latest version, but can be selected with
"update-alternatives --config libpetsc_real.so"
PETSC_DIR=/usr/lib/petscdir/petsc-complex
selects the preferred complex-number version of PETSc (by default the
latest version, but can be selected with
"update-alternatives --config libpetsc_complex.so"
Specific PETSc versions and builds as found under /usr/lib/petscdir
can also be selected with PETSC_DIR.
For example,
PETSC_DIR=/usr/lib/petscdir/petsc-complex python3 -c "import petsc4py; print(petsc4py.__path__)"
prints the path to the petsc4py module built against the preferred
complex-number build of PETSc.
Alternative builds include 64-bit builds of PETSc (64-bit indexing)
e.g.
PETSC_DIR=/usr/lib/petscdir/petsc64-real
PETSC_DIR=/usr/lib/petscdir/petsc64-complex
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