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我安装了 mpi4py 1.3 和 openMPI 1.6。像 helloworld.py 这样的简单 mpi4py 演示正在运行。在我的代码MPI.Comm.Allreduce(MPI.IN_PLACE, obj)中，我调用 obj 是一个 numpy 数组。这会导致错误消息：

ValueError：消息：无法猜测计数，数据类型范围 0 (lb:0, ub:0)”在 message_simple

关于我做错了什么的任何线索？

完整追溯：

Traceback (most recent call last):
  File "ptycho_508.py", line 124, in <module>
   p = ptycho.ptycho_DM(p, numit=numit_DM, subpix=False)
  File "/afs/psi.ch/project/cxs/users/braun_p/epd/lib/python2.7/site-packages/ptycho/core_object_modes.py", line 1357, in ptycho_DM comm.Allreduce(MPI.IN_PLACE, obj)
  File "Comm.pyx", line 544, in mpi4py.MPI.Comm.Allreduce (src/mpi4py.MPI.c:63736)
  File "message.pxi", line 579, in mpi4py.MPI._p_msg_cco.for_allreduce (src/mpi4py.MPI.c:23465)
  File "message.pxi", line 532, in mpi4py.MPI._p_msg_cco.for_cro_recv (src/mpi4py.MPI.c:23068)
  File "message.pxi", line 144, in mpi4py.MPI.message_simple (src/mpi4py.MPI.c:19614)
ValueError: message: cannot guess count, datatype extent 0 (lb:0, ub:0)
message_simple in <http://mpi4py.googlecode.com/svn/trunk/src/MPI/message.pxi> is failing
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