Qfyilyi

I am trying to use Mpi4py 1.3 with python 2.7 on Windows 7 64bits. I downloaded the installable version from here which includes OpenMPI 1.6.3 so in the installed directory (*/Python27Libsite-packagesmpi4pylib) following libraries exist: libmpi.lib, libmpi_cxx.lib, libopen-pal.lib, and libopen-rte.lib. Now in my codes when trying to import it:

from mpi4py import MPI

It returns following error:
ImportError: DLL load failed: The specified module could not be found. I tried to copy a bove lib files alongside the */Python27Libsite-packagesmpi4pyMPI.pyd and even to Windows/System32, but it didn't work. I appreciate your help on what DLL is missing and how to fix the error?

Thanks,

@Aso.agile

Use sys.prefixlibsite-packagesmpi4pybinpython-mpi.exe or add the following code to sys.prefixlibsite-packagesmpi4py__init__.py around line 37:

def _init_openmpi():

    """Pre-load libmpi.dll and register OpenMPI distribution."""

    import os

    import ctypes

    if os.name != 'nt' or 'OPENMPI_HOME' in os.environ:

        return

    try:

        openmpi_home = os.path.abspath(os.path.dirname(__file__))

        openmpi_bin = os.path.join(openmpi_home, 'bin')

        os.environ['OPENMPI_HOME'] = openmpi_home

        os.environ['PATH'] = ';'.join((openmpi_bin, os.environ['PATH']))

        ctypes.cdll.LoadLibrary(os.path.join(openmpi_bin, 'libmpi.dll'))

    except Exception:

        pass



_init_openmpi()