Direct Linear Solvers

[Satish Balay]

If you need parallel direct solvers - then you can try MUMPS or
Spooles or SuperLU_Dist external packages with PETSc.

I don't think they work on windows - so you might have to use linux
[with a f90 compiler for MUMPS]

The default LU in PETSc is sequential. 

Satish

On Thu, 24 Aug 2006, Julian wrote:

> Hello,
> 
> I looked at the linear solvers summary page and I could find three direct
> solvers that do not use any external packages. But I could find an example
> for only one of them (LU). The link to the cholesky solver does not have any
> example file. I am new to PETSc and I don't fully understand how the
> different solvers are invoked. Do I just change  PCSetType(pc,PCLU); to  
> PCSetType(pc,PCCHOLESKY); ?
> 
> And the "XXt and Xyt" solver does not have any link. How do I use that
> solver?
> 
> Also, do the direct solvers do its own internal renumbering to reduce the
> matrix bandwidth? Or do we have to take care of that outside of PETSc?
> 
> Thanks,
> Julian.
> 
> 
> 
>