[petsc-users] MatSOR for matrix of seqcusp type

[Chao Yang]

Good to know. Thanks a lot.
Have a good weekend!

Chao

On Mar 5, 2011, at 11:03 AM, Barry Smith wrote:

> 
> On Mar 4, 2011, at 8:56 PM, Chao Yang wrote:
> 
>> Hi, Barry,
>> 
>> So it's just like MatSolve, too sequential.
> 
>  Yup.
> 
>   BTW: we hope to have a MatSolve() for SeqAIJ fairly soon. It won't be great but hopefully a bit better than using the CPU.
> 
>   Barry
> 
>> Thanks for the hint!
>> 
>> Chao
>> 
>> On Mar 4, 2011, at 9:43 PM, Barry Smith wrote:
>> 
>>> 
>>> 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
>>> 
>> 
>