Hi all, This came up a while ago on the mpi4py mailing list [1] and with CUDA 6 brining unified virtual memory it may become more important in the future.
It would be nice if PyCUDA device allocations provided a method for
creating a suitable Python buffer object: e.g, myalloc.asbuf(offset=0,
sz=...). This would provide a clean way for PyCUDA and mpi4py to
interoperate (as the wrapped MPI functions expect Python buffer objects
as opposed to pointers).
Currently one must either resort to writing a C extension or hacks such as:
import ctypes as ct
make_buf = ct.pythonapi.PyBuffer_FromMemory
make_buf.argtypes = [ct.c_void_p, ct.c_ssize_t]
make_buf.restype = ct.py_object
cubuf = cuda.mem_alloc(SZ*8)
pybuf = make_buf(long(cubuf), SZ*8)
Regards, Freddie.
[1]
<https://groups.google.com/forum/#!searchin/mpi4py/cuda/mpi4py/qpM-ZcAtA_Y/34qXGuf8fQsJ>
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