[petsc-users] MatSOR for matrix of seqcusp type

[Barry Smith]

On Mar 4, 2011, at 3:42 AM, Chao Yang wrote:

> Dear PETSc team,
> 
> I am developing a code using PETSc on GPU. In the code an SOR preconditioner is needed.
> Is there an available version of SOR for matrix of seqcusp type in the current petsc-dev?

    No. The problem is that SOR is a sequential algorithm, there is not much parallelism in it and GPUs require/use a great deal of parallelism to get good performance. 
Do you have alternatives? How about diagonal scaled CG or Bi-CG-stab?


   Barry



> Thanks!
> 
> Best regards,
> 
> Chao Yang