[petsc-dev] Not possible to do a VecPlaceArray for veccusp

[Karl Rupp]

Hi Jeff,

 >     Ok, this is on fairly short notice considering the changes required.
>     I recommend to start with copying the CUSP sources and migrate it
>     over to VECCUDA by replacing any use of cusp::array1d to a raw CUDA
>     handle. Operations from CUSP should be replaced by CUBLAS calls.
>
>
> It's hard to imagine any performance benefit from this unless CUSP
> sucks. What am I missing?

This is not about performance, but about providing the ability for users 
to 'implant' their own memory buffers. CUSP doesn't allow it (which was 
the initial point of this thread).

Best regards,
Karli