[petsc-users] GPU questions

[SUN Chun]

Hi PETSc developers,

I have some questions regarding GPGPU support in PETSc. Sorry if these questions are redundant, I didn't browse the dev code too carefully...

1.  The only example I can find is tutorial/ex47. Is there a plan to provide more examples involving KSP with, say, simple Jacobi PC? I thought KSP is supported but PC is not.

2. Would you please comment on the difficulty in supporting PCs? Like ILU, SSOR.... Would you please also comment on the difficulty in supporting external libraries such as ML?

3. I noticed (might be wrong), MatMult in CUDA is implemented in such a way that we copy the lhs and rhs to GPU each time before we do MatVec. I understand that you may have to do this to ensure MatMult being robust, but I'm worried about performance. Is it possible, say, like in KSP, we keep the lhs and intermediate results on the GPU side? 

4. Any performance data on Tesla/Fermi card? I saw from the webpage  you only have Tesla card?

5. Is there a roadmap, a plan, a timeline..., regarding PETSc and nVidia's collaboration for a final fully GPGPU compatible PETSc?


Thanks a lot for your time!
Chun


This email and any attachments are intended solely for the use of the individual or entity to whom it is addressed and may be confidential and/or privileged.  If you are not one of the named recipients or have received this email in error, (i) you should not read, disclose, or copy it, (ii) please notify sender of your receipt by reply email and delete this email and all attachments, (iii) Dassault Systemes does not accept or assume any liability or responsibility for any use of or reliance on this email.For other languages, go to http://www.3ds.com/terms/email-disclaimer.