[petsc-dev] [GPU] Performance on Fermi

[Matthew Knepley]

On Fri, Aug 27, 2010 at 7:19 PM, Keita Teranishi <keita at cray.com> wrote:

> Barry,
>
> Yes. It improves the performance dramatically, but the execution time for
> KSPSolve stays the same.
>
> MatMult 5.2 Gflops
>

I will note that to put the matvec on the GPU you will also need -mat_type
aijcuda.

   Matt


> Thanks,
>
> ================================
>  Keita Teranishi
>  Scientific Library Group
>  Cray, Inc.
>  keita at cray.com
> ================================
>
>
> -----Original Message-----
> From: petsc-dev-bounces at mcs.anl.gov [mailto:petsc-dev-bounces at mcs.anl.gov]
> On Behalf Of Barry Smith
> Sent: Friday, August 27, 2010 2:15 PM
> To: For users of the development version of PETSc
> Subject: [petsc-dev] [GPU] Performance on Fermi
>
>
>   PETSc-dev folks,
>
>      Please prepend all messages to petsc-dev that involve GPUs with [GPU]
> so they can be easily filtered.
>
>    Keita,
>
>      To run src/ksp/ksp/examples/tutorials/ex2.c with CUDA you need the
> flag -vec_type cuda
>
>      Note also that this example is fine for simple ONE processor tests but
> should not be used for parallel testing because it does not do a proper
> parallel partitioning for performance
>
>    Barry
>
> On Aug 27, 2010, at 2:04 PM, Keita Teranishi wrote:
>
> > Hi,
> >
> > I ran ex2.c with a matrix from 512x512 grid.
> > I set CG and Jacobi for the solver and preconditioner.
> > GCC-4.4.4 and CUDA-3.1 are used to compile the code.
> > BLAS and LAPAKCK are not optimized.
> >
> > MatMult
> > Fermi:                1142 MFlops
> > 1 core Istanbul:      420 MFlops
> >
> > KSPSolve:
> > Fermi:                        1.5 Sec
> > 1 core Istanbul:      1.7 Sec
> >
> >
> > ================================
> >  Keita Teranishi
> >  Scientific Library Group
> >  Cray, Inc.
> >  keita at cray.com
> > ================================
> >
> >
> > -----Original Message-----
> > From: petsc-dev-bounces at mcs.anl.gov [mailto:
> petsc-dev-bounces at mcs.anl.gov] On Behalf Of Satish Balay
> > Sent: Friday, August 27, 2010 1:49 PM
> > To: For users of the development version of PETSc
> > Subject: Re: [petsc-dev] Problem with petsc-dev
> >
> > On Fri, 27 Aug 2010, Satish Balay wrote:
> >
> >> There was a problem with tarball creation for the past few days. Will
> >> try to respin manually today - and update you.
> >
> > the petsc-dev tarball is now updated on the website..
> >
> > Satish
>
>


-- 
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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