[petsc-dev] pnetcdf is a big problem

[Satish Balay]

On Wed, 20 Dec 2017, Blaise A Bourdin wrote:

> There are two ways to write parallel netcdf files:
> 
> Use netcdf-4 (hdf5 based) files
> Use pnetcdf and old-style netcdf files.
> 
> Perhaps the best would be to compile netcdf with pnetcdf support only if petsc is configured with exodusii? I can send a patch this afternoon.

Current code already does this. i.e pnetcdf is an optional [i.e not mandatory] dependency for netcdf


For now - I'm disabling pnetcdf+exodus from this test case. [until this issue gets resolved]

Satish

> Greg Sjaardema, the exodus maintainer, has been very responsive, I will try to iron out the last exodus / netcdf-4 bugs, but it sure would be noce to be able to read / write old style files too…
> 
> Blaise
> 
> 
> 
> > On Dec 19, 2017, at 5:32 PM, Smith, Barry F. <bsmith at mcs.anl.gov> wrote:
> > 
> > 
> > 
> >> On Dec 19, 2017, at 5:30 PM, Jed Brown <jed at jedbrown.org> wrote:
> >> 
> >> Does ExodusII write pnetcdf?  It's a different interface from (parallel)
> >> NetCDF4.
> > 
> >   Shudder!
> > 
> >> 
> >> Matthew Knepley <knepley at gmail.com> writes:
> >> 
> >>> Blaise really wants to write in parallel. It would be better to use HDF5,
> >>> but evidently
> >>> it is broken in ExodusII. Thats what we get for using something from
> >>> Sandia. They
> >>> finally have their revenge.
> >>> 
> >>>  Matt
> >>> 
> >>> On Tue, Dec 19, 2017 at 5:53 PM, Smith, Barry F. <bsmith at mcs.anl.gov> wrote:
> >>> 
> >>>> 
> >>>> Do you really need to use pnetcdf? No one uses it and what usefulness
> >>>> does it really provide, best to be avoided.
> >>>> 
> >>>>  Barry
> >>>> 
> >>>> 
> >>>>> On Dec 19, 2017, at 1:12 PM, Satish Balay <balay at mcs.anl.gov> wrote:
> >>>>> 
> >>>>> parallel-netcdf-1.9.0.pre1/INSTALL has:
> >>>>> 
> >>>>>>>>>>>> 
> >>>>> 
> >>>>> 4. Reporting Installation or Usage Problems
> >>>>> ===========================================
> >>>>> 
> >>>>> Please send an email to parallel-netcdf at mcs.anl.gov
> >>>>> 
> >>>>> <<<<<<
> >>>>> 
> >>>>> We'll have to send in these bug reports.
> >>>>> 
> >>>>> Satish
> >>>>> 
> >>>>> 
> >>>>> On Tue, 19 Dec 2017, Matthew Knepley wrote:
> >>>>> 
> >>>>>> The configure is broken, perhaps beyond fixing. I need to give
> >>>> --with-mpi
> >>>>>> to get anything
> >>>>>> to work because the way it checks for MPI is screwed up. I will see if I
> >>>>>> can throw away all its idiotic configure stuff in favor of just telling
> >>>> it
> >>>>>> everything, but I am not eager to depend on something so rickety.
> >>>>>> 
> >>>>>> Matt
> >>>>>> 
> >>>>>> 
> >>>>> 
> >>>> 
> >>>> 
> >>> 
> >>> 
> >>> -- 
> >>> 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.caam.rice.edu/~mk51/>
> > 
> 
>