about KSP based on parallel dense matrix

[Yujie]

thank you very much, Hong.

On Tue, Sep 23, 2008 at 8:26 AM, Hong Zhang <hzhang at mcs.anl.gov> wrote:

>
> Yujie,
>
>
>> Barry has tried to establish an interface for Plapack. However, there are
>> some bugs in Plapack. Therefore, it doesn't work. I am wondering if CG in
>>
>
> The Plapack interface in the realeased petsc-2.3.3 should work fine.
> Additional work is needed to make it work under reorganization
> in petsc-dev, which I'm working on.
>
> Note, Plapack implements LU precontioner.
>
> Hong
>
>  Petsc can work with parallel dense matrix. When using the same matrix,
>> which
>> one is faster, sequential or parallel? thanks.
>>
>> Regards,
>>
>> Yujie
>>
>> On Mon, Sep 22, 2008 at 6:51 PM, Lisandro Dalcin <dalcinl at gmail.com>
>> wrote:
>>
>>  Well, any iterative solver will actually work, but expect a really
>>> poor scalability :-). I believe (never used dense matrices) that you
>>> could use a direct method (PLAPACK?), but again, be prepared for long
>>> running times if your problem is (even moderately) large.
>>>
>>> On Mon, Sep 22, 2008 at 10:35 PM, Yujie <recrusader at gmail.com> wrote:
>>>
>>>> To my knowledge, PETsc doesn't provide parallel dense matrix-based
>>>>
>>> solvers,
>>>
>>>> such as for CG, GMRES and so on. If it is, how to deal with this
>>>> problem?
>>>> Thanks.
>>>>
>>>> Regards,
>>>>
>>>> Yujie
>>>>
>>>>
>>>
>>>
>>> --
>>> Lisandro Dalcín
>>> ---------------
>>> Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
>>> Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
>>> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
>>> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
>>> Tel/Fax: +54-(0)342-451.1594
>>>
>>>
>>>
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