[petsc-dev] PETSc port to OpenCL

[Reymond, Antoine]

Customer is saying:

We are performing nonlinear SNES solvers with linear KSP solves inside of them.  The KSP solver types that we use are CG, CGS, BiCG, BiCGS, GMRES, Richardson, and LSQR; though Richardson and LSQR are very infrequently used.  We use a block Jacobi preconditioner with the following sub-preconditioner types:  None, ILU, LU, ICC, Cholesky, and Jacobi.  The global system sizes range from 10k x 10k to 20M x 20M depending on model size.  We typically run the smaller models on 4-core workstations and the larger models with between 32 and 128 cores on an HPC.  The workstations will only have a single GPU, but the HPC may have one GPU per 16 cores (1 GPU per HPC node).

Antoine


From: petsc-dev-bounces at mcs.anl.gov [mailto:petsc-dev-bounces at mcs.anl.gov] On Behalf Of Paul Mullowney
Sent: Wednesday, March 13, 2013 1:43 PM
To: For users of the development version of PETSc
Subject: Re: [petsc-dev] PETSc port to OpenCL

Hi Antoine,

I don't think one can claim that PETSc supports OpenCL right now. However, I think progress has definitely been made in getting core vector computations (for a Krylov algorithm) to run via OpenCL.

Karl, do you have any comment on this?

Once those are in place, it wouldn't be too difficult to get a prototype matrix class into PETSc where the other core pieces of a solve, mainly SpMV (and potentially the triangular solves) run on AMD devices.

The real question is, what algorithms does your customer want to run? i.e. is it a KSP solve? What is the preconditioner? How big is the system? Are multiple GPUs neeeded?

-Paul




We (AMD FirePro) have a customer using PETSc and trying to port their thermal/ablation solver code to OpenCL.
Do you support AMD GPUs and OpenCL?

Ref: Comparing the AMD FirePro S10000 to the Nvidia Tesla K10, K20 and K20X<http://fireuser.com/blog/comparing_the_amd_firepro_s10000_to_the_tesla_k10_k20_and_k20x>
AMD FirePro(tm) S10000 Server Graphics<http://www.amd.com/us/products/workstation/graphics/firepro-remote-graphics/S10000/Pages/S10000.aspx#1>
Heterogeneous Compute - Tools<http://developer.amd.com/tools/>

Regards,

Antoine Reymond
Sr. Strategic Alliances Manager
AMD Professional Graphics
O: +(1) 949 336 6244  M: +(1) 949 870 2200

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