You misunderstand the usage of MatGetSubMatrix(). Any process can
request ANY row, including rows that are not originally owned by that
process.
Barry
On Dec 1, 2009, at 8:29 AM, ming zhu wrote:
It seems that MatGetSubMatrix() only get the local matrix for the
processor If U
--download-mpich=1 defaults to gforker i.e a single machine.
If you wish to run on multiple machines - then you'll have to
figureout what mechanism you'd like to use - and then direct the MPI
install for that method.
For eg: - the common method is to use MPD. So you can install petsc with
Don't know what MatGetSubMatrixRaw() is, but based on the calling
sequence you are asking for the ith row whatever that is, and n
columns in the array indices
For MatGetSubMatrix() each process can ask for any rows it wants,
but all the processors have to ask for the same columns
://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20091201/bde08404/attachment.htm
