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pythonインタプリタで`import mpi4py`はできますか？
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---
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以下のコードがを`bench.py`と名付けて、`mpirun -n 4 python bench.py `してみてください。
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```python
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import sys as _sys
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from mpi4py import MPI
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def helloworld():
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comm = MPI.COMM_WORLD
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size = comm.Get_size()
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rank = comm.Get_rank()
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name = MPI.Get_processor_name()
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message = ("Hello, World! I am process %*d of %d on %s.\n"
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% (len(str(size - 1)), rank, size, name))
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comm.Barrier()
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if rank > 0:
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comm.Recv([None, 'B'], rank - 1)
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if True:
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_sys.stdout.write(message)
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_sys.stdout.flush()
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if rank < size - 1:
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comm.Send([None, 'B'], rank + 1)
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comm.Barrier()
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helloworld()
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```
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