[petsc-dev] [GPU] Performance on Fermi

[Keita Teranishi]

Barry,

Yes. It improves the performance dramatically, but the execution time for KSPSolve stays the same.

MatMult 5.2 Gflops

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

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