[Starpu-devel] pre-processing on CPU for openCL task

[Tristan Cabel <tsltc@nus.edu.sg>]

Hello,

I am starting to use starpu (Discontinuous Galerkin method applied to 
Maxwell equations) with CPU + OpenCL and I have a question.

I have a principal task (task A) with 2 implementations (CPU and OpenCL) 
and a pre-procesing task (task B) with only a CPU implementation. 
Moreover the task B is only required for the OpenCL implementation of 
the task A.

To synthetize :
  CPU    version --> task A with CPU codelet
  OpenCL version --> pre-processing task B on CPU then task A on openCL

Write now I am calling task B before task A regardless of the 
implementation of task A but I would like to know is either possibility 
is possible :
 - how can I access CPU pointers with STARPU_VECTOR_GET_PTR in a OpenCL 
function?
 - is it possible to tell StarPU that before executing task A on 
OpenCL, it has to execute task B (but not if task A is taken over by a CPU)

Thanks,

Regards,

Tristan CABEL