[petsc-dev] XDMF viewers

[Tim Gallagher]

XDMF has collections and a time tag, so you can assign a time step to each dataset and create a collection of those datasets. You can put the data either in the same HDF5 file or different HDF5 file each time step, with a single XML file that points in the right place for each time step. 

We (usually) do not have a changing grid, so we have a grid HDF5 file that is pointed to in each dataset with different data files for each. But instead of specifying different files, you can specify different groups inside an HDF5 file. 

Is that what you mean by storing time steps? 

Tim 

----- Original Message -----

From: "Matthew Knepley" <knepley at gmail.com> 
To: "For users of the development version of PETSc" <petsc-dev at mcs.anl.gov> 
Sent: Saturday, December 3, 2011 4:25:19 PM 
Subject: Re: [petsc-dev] XDMF viewers 

On Sat, Dec 3, 2011 at 3:24 PM, Jed Brown < jedbrown at mcs.anl.gov > wrote: 





On Sat, Dec 3, 2011 at 15:20, Matthew Knepley < knepley at gmail.com > wrote: 

<blockquote>
Does that matter? The same things are stored at each step. 



Sure (if the mesh doesn't change, which is okay with me now), but you have to put the data somewhere. I don't see how you would do that with the current API, but it should be simple to accommodate. 
</blockquote>

Brad did it, but I believe he uses HDF5 attributes 


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 

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