[petsc-users] (no subject)

[Sai Rajeshwar]

ok,

so considering performance on MIC

can the library MAGMA be used as an alternate to Viennacl for PETSc or
FEniCS?

http://www.nics.tennessee.edu/files/pdf/hpcss/04_03_LinearAlgebraPar.pdf
(from slide 37 onwards)

MAGMA seems to have sparse version which i think is doing all that any
sparse non linear solver can do..   MAGMA-sparse..

will this be helpful in using with MIC

*with regards..*

*M. Sai Rajeswar*
*M-tech  Computer Technology*


*IIT Delhi----------------------------------Cogito Ergo Sum---------*


On Wed, Jun 11, 2014 at 8:34 PM, Karl Rupp <rupp at iue.tuwien.ac.at> wrote:

> Hi,
>
> >    Im a masters student from Indian Institute of Technology delhi. Im
>
>> working on PETSc.. for performance, which is my area of interest. Can
>> you please help me in knowing 'How to run PETSc on MIC' .    That would
>> be of great help to me.
>>
>
> my experience is that 'performance' and 'MIC' for bandwidth-limited
> operations don't go together. Regardless, you can use ViennaCL by building
> via
>  --download-viennacl
> for using the MIC via OpenCL, but you are usually much better off with a
> proper multi-socket CPU node.
>
> Feel free to have a look at my recent slides from the Intl. OpenCL
> Workshop here:
> http://iwocl.org/wp-content/uploads/iwocl-2014-tech-
> presentation-Karl-Rupp.pdf
> PDF page 32 shows that in the OpenCL case one achieves only up to 20% of
> peak bandwidth for 1900 different kernel configurations even for simple
> kernels such as vector copy, vector addition, dot products, or dense
> matrix-vector products. With some tricks one can probably get 30%, but
> that's it.
>
> PETSc does not provide any 'native' OpenMP execution on MIC for similar
> reasons.
>
> Best regards,
> Karli
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20140612/37ccde83/attachment-0001.html>