[petsc-users] Tuning the parallel performance of a 3D FEM CFD code

[Jed Brown]

On Sun, May 15, 2011 at 18:41, Barry Smith <bsmith at mcs.anl.gov> wrote:

> This may help a bit but I'm not sure how dramatically. What we could really
> use is a point block ILU for AIJ matrices with inodes. That is each inode
> set of rows is eliminated simultaneously (by factoring the little diagonal
> block associated with that inode).


But, pivoting aside, what is the difference between point and point-block
ILU when there is no discarded fill within the block?
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