On Sun, Oct 7, 2012 at 3:56 PM, Anders Logg <[email protected]> wrote: > On Sun, Oct 07, 2012 at 01:44:19PM +0100, Garth N. Wells wrote: >> Thanks to good work by Chris Richardson, support for the XDMF output >> format with HDF5 data storage is available in the development version >> of DOLFIN. HDF5 must be installed ('apt-get install >> libhdf5-openmpi-dev' or 'apt-get install libhdf5-mpich-dev' for >> Debian/Ubuntu users) to use it. To write to an XDMF file, just do >> >> file = File("foo.xdmf") >> file << u >> >> XDMF files can be read by ParaView, and have the following advantages >> over the VTK format: >> >> - All output data is stored in a single file (even in parallel), >> rather than the (#num_time_steps x #num_processes) files for VTK XML >> files >> >> - For Functions, the Mesh is not stored at every time step. At present >> the Mesh data structure is hashed to detect changes, with a new Mesh >> written to file only when a change is detected. This may change in the >> future. >> >> - Output files are much small than uncompressed VTK files >> >> - Writing output files is faster (about 5x for meshes, at present) > > Great! > >> Please try it out and report any issues. Since HDF5 is an optional >> dependency, no demos have been set to use XDMF yet. > > Except for this one? > > demo/undocumented/hdf5 >
I mean to take it out - it won't work without HDF5. >> Some options for >> adding XDMF output to the demos are >> >> 1) Fall-back to VTK/PVD format if XDMF is not available; or >> 2) Add support for writing ASCII data in the XDMF file if HDF5 is not >> available. > > It would be easy to make File.cpp choose VKT (pvd) if XDMF is not > available. I haven't tried the XDMF output yet, but if it works well I > don't see why we shouldn't make it the default output format and > change to XDMF in all the demos, with automatic fallback to VTK. > ok. Garth > -- > Anders _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
