[petsc-users] What block size means in amg aggregation type

[Eduardo Jourdan]

Hi,

I am kind of new to algebraic multigrid methods. I tried to figure it on my
own but I'm not be sure about it.

How the block size (bs) of a blocked matrix affects the AMG AGG? I mean, if
bs = 4, then
in the coarsening phase and setup, blocks of 4x4 matrix elements are
considered to remain in the coarse level and a certain quantity of block
neighbors are restricted and remain in the finer level? Never a row inside
a block matrix is selected and the other elements of this block aren't, am
I right? The entire block is interpolated when it comes to the
interpolation phase?

If the original problem is not a system of equations, then bs=1?

Thank you,

Eduardo
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