[petsc-users] HDF5 timestepping in PETSc 3.16

[Matthew Knepley]

On Mon, Feb 28, 2022 at 7:40 AM Jeremy Theler <jeremy at seamplex.com> wrote:

> On Thu, 2021-10-21 at 13:04 -0400, Matthew Knepley wrote:
> > On Tue, Oct 19, 2021 at 6:12 AM Matthew Knepley <knepley at gmail.com>
> > wrote:
> > > 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
> > >
> > > 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.
> > >
> > Okay, I think I have it. Can you look at this branch?
> >
> >   https://gitlab.com/petsc/petsc/-/merge_requests/4483
> >
> > There is now an option that lets you set the default timestepping
> > behavior
> >
> >   -viewer_hdf5_default_timestepping
> >
> > I think that is what you want.
>
> I'd like to rely on PetscViewerHDF5SetDefaultTimestepping() to provide
> backwards compatibility as well. This branch has been merged into
> master back in November but never made it to the stable v3.16 releases.
>
> Can you guys check please?
>

Yes, it is in main. Since it was an interface change, it does not go in a
point release for
3.16, but rather in the 3.17 release. We do a feature release about every 6
months.
Since 3.16 was released on Sept 29 2021, I estimate 3.17 in March/April.

  Thanks,

     Matt


> Thanks
> --
> jeremy theler
> www.seamplex.com
>
>
>

-- 
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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