Error loading MPI DLL in mpi4py

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

edited Dec 23 '12 at 12:37

asked Dec 22 '12 at 16:23

Aso Agile

142412

*.lib are either static library archives or import libraries. These are definitely not DLLs.

– Hristo Iliev
Dec 23 '12 at 9:16

Thanks @HristoIliev for your comment.You right *.lib are static library which in this case OpenMPI is provided in form of. Then what DLL is missing?

– Aso Agile
Dec 23 '12 at 12:40

Sorry, never used mpi4py, lest on Windows. Check the installation directory. May be there is a bitness mismatch (there were some Windows installation problems discussed recently on the Open MPI mailing lists...)

– Hristo Iliev
Dec 23 '12 at 20:50

add a comment |

from mpi4py import MPI

Thanks,

@Aso.agile

edited Dec 23 '12 at 12:37

asked Dec 22 '12 at 16:23

Aso Agile

142412

*.lib are either static library archives or import libraries. These are definitely not DLLs.

– Hristo Iliev
Dec 23 '12 at 9:16

Thanks @HristoIliev for your comment.You right *.lib are static library which in this case OpenMPI is provided in form of. Then what DLL is missing?

– Aso Agile
Dec 23 '12 at 12:40

Sorry, never used mpi4py, lest on Windows. Check the installation directory. May be there is a bitness mismatch (there were some Windows installation problems discussed recently on the Open MPI mailing lists...)

– Hristo Iliev
Dec 23 '12 at 20:50

add a comment |

from mpi4py import MPI

Thanks,

@Aso.agile

edited Dec 23 '12 at 12:37

asked Dec 22 '12 at 16:23

Aso Agile

142412

from mpi4py import MPI

Thanks,

@Aso.agile

python python-2.7 openmpi

edited Dec 23 '12 at 12:37

asked Dec 22 '12 at 16:23

Aso Agile

142412

edited Dec 23 '12 at 12:37

asked Dec 22 '12 at 16:23

Aso Agile

142412

edited Dec 23 '12 at 12:37

asked Dec 22 '12 at 16:23

Aso Agile

142412

asked Dec 22 '12 at 16:23

Aso Agile

142412

asked Dec 22 '12 at 16:23

Aso Agile

142412

*.lib are either static library archives or import libraries. These are definitely not DLLs.

– Hristo Iliev
Dec 23 '12 at 9:16

Thanks @HristoIliev for your comment.You right *.lib are static library which in this case OpenMPI is provided in form of. Then what DLL is missing?

– Aso Agile
Dec 23 '12 at 12:40

Sorry, never used mpi4py, lest on Windows. Check the installation directory. May be there is a bitness mismatch (there were some Windows installation problems discussed recently on the Open MPI mailing lists...)

– Hristo Iliev
Dec 23 '12 at 20:50

add a comment |

*.lib are either static library archives or import libraries. These are definitely not DLLs.

– Hristo Iliev
Dec 23 '12 at 9:16

Thanks @HristoIliev for your comment.You right *.lib are static library which in this case OpenMPI is provided in form of. Then what DLL is missing?

– Aso Agile
Dec 23 '12 at 12:40

Sorry, never used mpi4py, lest on Windows. Check the installation directory. May be there is a bitness mismatch (there were some Windows installation problems discussed recently on the Open MPI mailing lists...)

– Hristo Iliev
Dec 23 '12 at 20:50

*.lib are either static library archives or import libraries. These are definitely not DLLs.

– Hristo Iliev
Dec 23 '12 at 9:16

Thanks @HristoIliev for your comment.You right *.lib are static library which in this case OpenMPI is provided in form of. Then what DLL is missing?

– Aso Agile
Dec 23 '12 at 12:40

Sorry, never used mpi4py, lest on Windows. Check the installation directory. May be there is a bitness mismatch (there were some Windows installation problems discussed recently on the Open MPI mailing lists...)

– Hristo Iliev
Dec 23 '12 at 20:50

add a comment |

2 Answers
2

active

oldest

votes

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()

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

I tried this, I added the code both before before and after the def get_include(): function, but it doesn't work. I don't quite get the first solution you propose.

– Toke Faurby
Jul 10 '18 at 11:45

This answer is long obsolete. It applies to a 5 year old binary of mpi4py that was linked to OpenMPI.

– cgohlke
Jul 11 '18 at 6:47

Makes sense, but do you have an idea as to how to fix it now?

– Toke Faurby
Jul 11 '18 at 10:15

I don't have windows to try, but maybe trying 'conda install mpi4py' might solve your problem. Similar workaround for linux: stackoverflow.com/a/38332136/1716869

– GrigorisG
Jan 4 at 11:08

add a comment |

Using Mpi4py 1.3 with python 3.5 on Windows 10, I can run import mpi4py successfully but not from mpi4py import MPI. To fix it, just reinstall MPI via MPI. This works for me.

answered Feb 27 at 14:33

R_Z

111

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

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()

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

I tried this, I added the code both before before and after the def get_include(): function, but it doesn't work. I don't quite get the first solution you propose.

– Toke Faurby
Jul 10 '18 at 11:45

This answer is long obsolete. It applies to a 5 year old binary of mpi4py that was linked to OpenMPI.

– cgohlke
Jul 11 '18 at 6:47

Makes sense, but do you have an idea as to how to fix it now?

– Toke Faurby
Jul 11 '18 at 10:15

I don't have windows to try, but maybe trying 'conda install mpi4py' might solve your problem. Similar workaround for linux: stackoverflow.com/a/38332136/1716869

– GrigorisG
Jan 4 at 11:08

add a comment |

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()

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

I tried this, I added the code both before before and after the def get_include(): function, but it doesn't work. I don't quite get the first solution you propose.

– Toke Faurby
Jul 10 '18 at 11:45

This answer is long obsolete. It applies to a 5 year old binary of mpi4py that was linked to OpenMPI.

– cgohlke
Jul 11 '18 at 6:47

Makes sense, but do you have an idea as to how to fix it now?

– Toke Faurby
Jul 11 '18 at 10:15

I don't have windows to try, but maybe trying 'conda install mpi4py' might solve your problem. Similar workaround for linux: stackoverflow.com/a/38332136/1716869

– GrigorisG
Jan 4 at 11:08

add a comment |

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()

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

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()

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

answered Jan 8 '13 at 15:23

cgohlke

7,75912425

I tried this, I added the code both before before and after the def get_include(): function, but it doesn't work. I don't quite get the first solution you propose.

– Toke Faurby
Jul 10 '18 at 11:45

This answer is long obsolete. It applies to a 5 year old binary of mpi4py that was linked to OpenMPI.

– cgohlke
Jul 11 '18 at 6:47

Makes sense, but do you have an idea as to how to fix it now?

– Toke Faurby
Jul 11 '18 at 10:15

I don't have windows to try, but maybe trying 'conda install mpi4py' might solve your problem. Similar workaround for linux: stackoverflow.com/a/38332136/1716869

– GrigorisG
Jan 4 at 11:08

add a comment |

I tried this, I added the code both before before and after the def get_include(): function, but it doesn't work. I don't quite get the first solution you propose.

– Toke Faurby
Jul 10 '18 at 11:45

This answer is long obsolete. It applies to a 5 year old binary of mpi4py that was linked to OpenMPI.

– cgohlke
Jul 11 '18 at 6:47

Makes sense, but do you have an idea as to how to fix it now?

– Toke Faurby
Jul 11 '18 at 10:15

I don't have windows to try, but maybe trying 'conda install mpi4py' might solve your problem. Similar workaround for linux: stackoverflow.com/a/38332136/1716869

– GrigorisG
Jan 4 at 11:08

I tried this, I added the code both before before and after the def get_include(): function, but it doesn't work. I don't quite get the first solution you propose.

– Toke Faurby
Jul 10 '18 at 11:45

This answer is long obsolete. It applies to a 5 year old binary of mpi4py that was linked to OpenMPI.

– cgohlke
Jul 11 '18 at 6:47

Makes sense, but do you have an idea as to how to fix it now?

– Toke Faurby
Jul 11 '18 at 10:15

I don't have windows to try, but maybe trying 'conda install mpi4py' might solve your problem. Similar workaround for linux: stackoverflow.com/a/38332136/1716869

– GrigorisG
Jan 4 at 11:08

add a comment |

Using Mpi4py 1.3 with python 3.5 on Windows 10, I can run import mpi4py successfully but not from mpi4py import MPI. To fix it, just reinstall MPI via MPI. This works for me.

answered Feb 27 at 14:33

R_Z

111

add a comment |

Using Mpi4py 1.3 with python 3.5 on Windows 10, I can run import mpi4py successfully but not from mpi4py import MPI. To fix it, just reinstall MPI via MPI. This works for me.

answered Feb 27 at 14:33

R_Z

111

add a comment |

Using Mpi4py 1.3 with python 3.5 on Windows 10, I can run import mpi4py successfully but not from mpi4py import MPI. To fix it, just reinstall MPI via MPI. This works for me.

answered Feb 27 at 14:33

R_Z

111

Using Mpi4py 1.3 with python 3.5 on Windows 10, I can run import mpi4py successfully but not from mpi4py import MPI. To fix it, just reinstall MPI via MPI. This works for me.

answered Feb 27 at 14:33

R_Z

111

answered Feb 27 at 14:33

R_Z

111

answered Feb 27 at 14:33

R_Z

111

answered Feb 27 at 14:33

R_Z

111

add a comment |

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