On Sun, Mar 14, 2010 at 07:39:45AM +0000, Garth N. Wells wrote: > > > Anders Logg wrote: > > On Fri, Mar 12, 2010 at 06:58:22PM -0000, [email protected] wrote: > >> ------------------------------------------------------------ > >> revno: 4635 > >> committer: Garth N. Wells <[email protected]> > >> branch nick: dolfin-all > >> timestamp: Fri 2010-03-12 18:53:05 +0000 > >> message: > >> Work on reading Vectors in parallel. Some issues to resolve still. > >> > >> Some issues: > >> - How should files be named when in parallel? > >> - Should we have a 'master' xml file which points to the files > >> - from different processes? > > > > I think this should be done in the same way as for Meshes. We > > discussed the following design: > > > > 1. Reading a single file "foo.xml" results in each process reading the > > entire file but skipping data located on another process as determined > > by local_range. This is what is implemented now for meshes (followed > > by communication and mesh partitioning). The difference for vectors > > would be that no extra communication is necessary. > > > > OK. > > > 2. Reading a set of files "foo*.xml" results in each process reading > > its portion stored in "foo%d.xml" % p. The File interface then needs > > to check for the occurence of '*' and figure out the correct file name > > based on its process number. > > > > I think that are a number of advantages to having a single .xml that > points to the 'sub-files'. An obvious advantage is that we won't need to > distinguish between cases 1 and 2 when reading in a vector. > > Garth
I don't feel strongly about either option, but if we go for the
master-file/sub-file design I think we should do the same for vectors
and meshes.
The master file could look something like this for vectors:
<distributed_vector size="1024" num_partitions="16">
<sub_vector partition="0" file="foo_0.xml" offset="0"/>
<sub_vector partition="1" file="foo_1.xml" offset="64"/>
<sub_vector partition="2" file="foo_2.xml" offset="128"/>
...
</distributed_vector>
For meshes, we can do this:
<distributed_mesh num_partitions="16">
<sub_mesh partition="0" file="foo_0.xml"/>
<sub_vector partition="1" file="foo_1.xml"/>
<sub_vector partition="2" file="foo_2.xml"/>
...
</distributed_mesh>
--
Anders
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