[petsc-users] tridiagonal matrix in kspsolve

[Shriram Srinivasan]

Apologies if my question  is answered elsewhere already. I could not 
find this discussed in the manual or mailing list.

I have been using matsolvermumps through ksp to solve my linear system. 
I wanted to simply get it working so I was not concerned about the 
structure of the matrix.


1) My matrix is tridiagonal, but the elements of the diagonals are not 
all equal.  Will a dedicated tridiagonal solver   be faster than 
matsolvermumps in this case ?

2) My matrix is tridiagonal but not in the conventional sense, the minor 
diagonals are farther apart. But it is possible to renumber the nodes 
and make it a conventional tridiagonal system. In this case, again, am I 
losing efficiency using matsolvermumps ?

Please advise if you recommend a completely different course of action.

Thanks,
Shriram