> 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
> 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
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