On 07/06/18 21:53, Yiyin Zhou wrote: > I ran into issues when running the following gist written by Lev. > https://gist.github.com/lebedov/8514d3456a94a6c73e6d#file-mpi4py_pycuda_demo-py > Basically the code works fine under Python 2.7 but I got the following > error in Python 3.6 (both with openmpi 3.0.0 and mpi4py 3.0.0). > > Traceback (most recent call last): > File "mpi4py_pycuda_demo.py", line 64, in <module> > comm.Recv([bufint(x_gpu), dtype_to_mpi(x_gpu.dtype)], source=0) > File "mpi4py/MPI/Comm.pyx", line 283, in mpi4py.MPI.Comm.Recv > File "mpi4py/MPI/msgbuffer.pxi", line 402, in mpi4py.MPI.message_p2p_recv > File "mpi4py/MPI/msgbuffer.pxi", line 388, in > mpi4py.MPI._p_msg_p2p.for_recv > File "mpi4py/MPI/msgbuffer.pxi", line 155, in mpi4py.MPI.message_simple > File "mpi4py/MPI/msgbuffer.pxi", line 94, in mpi4py.MPI.message_basic > File "mpi4py/MPI/asbuffer.pxi", line 308, in mpi4py.MPI.getbuffer > File "mpi4py/MPI/asbuffer.pxi", line 135, in mpi4py.MPI.PyMPI_GetBuffer > BufferError: memoryview: underlying buffer is not writable > > I am using 2017.1.1, so presumably the as_buffer method should already > return a writable buffer from a fix two years ago. Any suggestion is > appreciated!
The fix was incomplete. If I recall there are two places where it need be applied, and it somehow only ended up being fixed in one of them. As a workaround: from ctypes import c_int, c_ssize_t, c_void_p, pythonapi, py_object _make_pybuf = pythonapi.PyMemoryView_FromMemory _make_pybuf.argtypes = [c_void_p, c_ssize_t, c_int] _make_pybuf.restype = py_object buf = _make_pybuf(my_alloc, nbytes, 0x200) Regards, Freddie. > > Thanks, > Yiyin > > > > > _______________________________________________ > PyCUDA mailing list > [email protected] > https://lists.tiker.net/listinfo/pycuda >
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