I'm thinking a new object: CheckpointIO

So you do CheckpointIO.write()/read()

Cody and I are starting on this now - I'll provide a pull request once we get a ways in so you can comment.

Derek



On Thu, Nov 7, 2013 at 12:27 PM, Kirk, Benjamin (JSC-EG311) <benjamin.kirk@nasa.gov> wrote:
On Nov 7, 2013, at 10:37 AM, Cody Permann <codypermann@gmail.com>
wrote:

> Yes I did, and we are still tweaking it even now. I just add the nodeset information a few days ago so lets figure out what we need in the current version before the next release!

If at all possible I'd like to treat the "unique ids" the same way we do the other stuff:

XdrIO io(mesh);
io.partition_map_file_name() = ".";
io.unique_ids_file_name() = "n/a";
io.write("mesh.xda");

We can then write the (id,uid) in the connectivity block, and also along with the coordinates.

As for the header stuff, how about we target something more like this:

libMesh-0.9.2+ parallel type_size=8 sid_size=8 eid_size=8 side_size=8 bid_size=8
1000 # number of elements
1331 # number of nodes
. # boundary condition specification file
. # subdomain id specification file
. # unique id specification file
n/a # processor id specification file
n/a # p-level specification file
0 # subdomain id to name map
1000 # n_elem at level 0, [ type sid uid (n0 ... nN-1) ]


Or maybe just
libMesh-0.9.2+ parallel id_size=8


I think we can make better use of the "version" string for extensibility, basically treating it instead as a "feature" string.

---------------------------------------------------------------------

As for Derek's concern, I tend to agree that the current XDA file format has to address a lot of concerns that overcomplicate it for what he wants. I'll add another restriction: If we are limiting the parallel restart capability to

(1) always require an associated mesh,
(2) only work in the M->M case, and
(3) don't worry about version compatibility,

a new feature is desirable and not too hard.

I recommend

XdrIO io(mesh);

io.checkpoint("foo.xda");
...
io.restore("foo.xda");

and likewise for the EquationSystems.

Agreed?

-Ben


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