Hi All,
I'm trying to find a working method, or short-term hack of a working
method, to adapt my OpenCL application to run well on contemporary HPC
systems with NVIDIA GPUs. (i.e. Perlmutter at NERSC)
For this, I want or need to use GPU-side device pointers in the Message
Passing Interface (MPI) arguments for communication between nodes on the
supercomputer.
As far as I can tell, OpenCL provides no mechanism to obtain the
device-side memory pointer for either a cl_mem buffer object or SVM
allocation.
I would need this pointer to use with MPI calls.
In CUDA-based prototype codes, this type of MPI use to/from GPU memory is
straightforward because cudaMaloc() returns a device pointer that is
accepted in MPI_xyz() calls.
Has anyone tried something like this with POCL using the CUDA backend?
Or is there familiarity with the implementation that would suggest how to
get at this device pointer from a cl_mem object ?
Cheers,
-Noah
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