Hi guys, I have compiled petsc to use HDF5 package.
I like to store the data from a parallel vector(s) (obtained from structured DA in 3 dimensions) to file using VecView() in conjunction with PetscViewerHDF5Open(). I followed the example here http://www.mcs.anl.gov/petsc/petsc-current/src/dm/examples/tutorials/ex10.c.html and everything looks fine. However, I had a couple questions: 1- When I am done writing the parallel vector obtained from the DA (and PETSC_COMM_WORLD), // Create the HDF5 viewer PetscViewerHDF5Open<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Viewer/PetscViewerHDF5Open.html#PetscViewerHDF5Open> (PETSC_COMM_WORLD<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PETSC_COMM_WORLD.html#PETSC_COMM_WORLD> ,"gauss.h5",FILE_MODE_WRITE,&H5viewer); // Write the H5 file VecView<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecView.html#VecView> (gauss,H5viewer); // Cleaning stage PetscViewerDestroy<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Viewer/PetscViewerDestroy.html#PetscViewerDestroy> (&H5viewer); how can I add data that are just simple 1-D numbers stored on local arrays. Easier said, I would like to add the structured grid coordinates (first all x's, then all y's, and then all z's) at the end (or to the beginning) of each data (*.h5) file. But the grid coordinates are stored locally on each machine and not derived from any parallel vectors or DA. I was thinking about creating vectors and viewers using PETSC_COMM_SELF but i am not sure if that is the right approach since that vector is created on all processors locally. 2- When using VecView() and HDF5 writer, what is the status of data compression? The reason that I am asking is that, I used the same example above and comparing two files saved via two different PetscViewers, i.e. (just) Binary and HDF5 (Binary) the size is not reduced in the (*.h5) case. In fact, it is slightly bigger than pure binary file!! Is there any command we have to set in Petsc to tell HDF5 viewer to use data compression? Thanks for your patience, Best, Mohamad -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120119/3c7c2fc1/attachment-0001.htm>
