[petsc-dev] Petsc+ViennaCL usage

[Mani Chandra]

Thanks Karl. Is there anyway I can get the build info?

Also, my system is such that I have the GPU on one platform (0) and the CPU
on another (1). When I try using -viennalcl_device_cpu, it still uses the
GPU cause I think that it defaults to the first platform it finds which
only has the GPU. Is there some way to toggle between the platforms or do
you suggest that I manually pass in the contexts into viennacl?

Cheers,
Mani


On Tue, Jan 21, 2014 at 3:28 PM, Karl Rupp <rupp at mcs.anl.gov> wrote:

> Hi Mani,
>
>
> > I like to pass in "-cl-nv-verbose" for compilation on nvidia cards.
>
> ok, in such case you also want access to the compiler output, don't you?
>
>
>  Also, I pass in parameters, for ex "-D Nx=128 -D Ny=128". I'll look at
>> the ViennaCL api.
>>
>
> Use
>   viennacl::ocl::current_context().build_options("flags_here");
> and make sure you have VIENNACL_WITH_OPENCL defined for your compilation
> unit. I'll extend the PETSc API suitably when updating the ViennaCL
> bindings to the latest 1.5.1 release.
>
> Best regards,
> Karli
>
>
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