[petsc-dev] Dev release GPU solvers

[Matthew Knepley]

On Tue, Sep 6, 2011 at 11:12 AM, Randall Mackie <rlmackie862 at gmail.com>wrote:

>
> On Sep 6, 2011, at 9:08 AM, Barry Smith wrote:
>
> >
> >
> > On Sep 6, 2011, at 10:59 AM, Daniel Lowell wrote:
> >
> >> On this page: http://www.mcs.anl.gov/petsc/petsc-as/features/gpus.html
> >>
> >> It states: "All of the Krylov methods except KSPIBCGS run on the GPU."
> >> I actually could only find ksp/pc/bicgstabcusp for any ksp
> implementation on the GPU.
> >
> >  Daniel,
> >
> >     All the vector operations and the matrix-vector product used by the
> Krylov methods implemented in PETSc (except KSPIBCGS) run on the GPU without
> copying up or down vector or matrix values, in the same way as
> ksp/pc/bicgstabcusp does, hence we say they run on the GPU. In fact, in our
> tests our BiGCStab runs just as fast as the Nvidia CUSP code
> ksp/pc/bicgstabcusp.
> >
> >    In other words, higher level algorithms such as Krylov methods and
> Newton methods do not need to be "written for the GPU", so long as the
> kernel operations run on the GPU.
> >
> >
> >
> >   Barry
>
> Barry,
>
> But is this still only for real data types? Last time I checked, earlier
> this year, complex valued data were not
> supported under PETSc, even though complex data types are supported in
> CUSP.
>

I have not tried, but I do not understand why it would not work. We just use
PetscScalar. Can you send
the problem you found?

   Matt


> Randy
>
>
> >
> >>
> >> CUSP does have everything mentioned in the above PETSc link:
> >>
> http://code.google.com/p/cusp-library/wiki/QuickStartGuide#Iterative_Solvers
> >>
> >> However I don't see where any of it is implemented in the latest Dev
> release, Krylov solvers or preconditioners.
> >>
> >> Can anyone clear this up for me?
> >>
> >> Thanks,
> >>
> >> Daniel Lowell
> >
>
>


-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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