[petsc-users] HDF5 timestepping in PETSc 3.16

[Matthew Knepley]

On Mon, Oct 18, 2021 at 10:35 PM Adrian Croucher <a.croucher at auckland.ac.nz>
wrote:

> Any response on this?
>
> This is a bit of a showstopper for me - I can't upgrade to PETSc 3.16 if
> it does not allow my users to read their HDF5 files created using
> earlier versions of PETSc.
>
> So far I can't see a workaround. Possibly the timestepping functions
> need some kind of optional parameter to specify what the default
> timestepping attribute should be, if it's not present in the file
> (rather than just assuming it's false)?
>

I will fix it. I think I can do it tomorrow. Class just started this week
do it is hectic :)

I think you are right. We should always write the attribute, but have it be
false. We should
interpret a missing attribute as an old file.

  Thanks,

     Matt


> Regards, Adrian
>
> On 10/14/21 4:19 PM, Adrian Croucher wrote:
> > hi
> >
> > I am just testing out PETSc 3.16 and making the necessary changes to
> > my code. Amongst other things I now have to add a
> > PetscViewerHDF5PushTimestepping() call before starting to output
> > time-dependent results to HDF5 using a PetscViewer.
> >
> > I now also have to add this call before reading in sets of previously
> > computed time-dependent results (for restarting a simulation from the
> > results of a previous run).
> >
> > The problem with this is that if I try to read in the results of any
> > previous run, computed with an earlier version of PETSc (< 3.16), an
> > error is raised because the time-dependent datasets in the file do not
> > have the 'timestepping' attribute.
> >
> > Is there something else I need to do to make this work?
> >
> > - Adrian
> >
> --
> Dr Adrian Croucher
> Senior Research Fellow
> Department of Engineering Science
> University of Auckland, New Zealand
> email: a.croucher at auckland.ac.nz
> tel: +64 (0)9 923 4611
>
>

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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