Hello PETSc users, This email is a duplicata of this gitlab issue <https://gitlab.com/petsc/petsc/-/issues/1070>, sorry for any inconvenience caused.
I want to compute a PETSc vector in real mode, than perform calculations with it in complex mode. I want as much of this process to be parallel as possible. Right now, I compile PETSc in real mode, compute my vector and save it to a file, then switch to complex mode, read it, and move on. This creates unexpected behaviour using MPIIO, so on Lisandro Dalcinl's advice I'm moving to HDF5 format. My code is as follows (taking inspiration from petsc4py doc <https://www.mcs.anl.gov/petsc/petsc4py-current/docs/apiref/petsc4py.PETSc.Viewer-class.html#section-NestedClasses>, a bitbucket example <https://bitbucket.org/petsc/petsc4py/issues/70/difficulties-in-reading-from-hdf5-file> and another one <https://bitbucket.org/petsc/petsc4py/pull-requests/51/add-save-in-hdf5-format-demo>, all top Google results for 'petsc hdf5') : > viewer = PETSc.Viewer().createHDF5(file_name, 'r', > COMM_WORLD)q.load(viewer)q.ghostUpdate(addv=PETSc.InsertMode.INSERT, > mode=PETSc.ScatterMode.FORWARD) > > This crashes my code. I obtain traceback : > File "/home/shared/code.py", line 121, in Load viewer = > PETSc.Viewer().createHDF5(file_name, 'r', COMM_WORLD) File > "PETSc/Viewer.pyx", line 182, in > petsc4py.PETSc.Viewer.createHDF5petsc4py.PETSc.Error: error code 86[0] > PetscViewerSetType() at > /usr/local/petsc/src/sys/classes/viewer/interface/viewreg.c:442[0] Unknown > type. Check for miss-spelling or missing package: > https://petsc.org/release/install/install/#external-packages[0] Unknown > PetscViewer type given: hdf5 > > I have petsc4py 3.16 from this docker container <https://hub.docker.com/r/dolfinx/dolfinx> (list of dependencies <https://docs.fenicsproject.org/dolfinx/main/python/installation.html#dependencies> include PETSc and petsc4py). I'm pretty sure this is not intended behaviour. Any insight as to how to fix this issue (I tried running ./configure --with-hdf5 to no avail) or more generally to perform this jiggling between real and complex would be much appreciated, Kind regards. Quentin