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 |

1 Answer
1

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

7,67012424

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 |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f14004457%2ferror-loading-mpi-dll-in-mpi4py%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

1 Answer
1

active

oldest

votes

1 Answer
1

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

7,67012424

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

7,67012424

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

7,67012424

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

7,67012424

edited Jan 8 '13 at 15:47

answered Jan 8 '13 at 15:23

cgohlke

7,67012424

answered Jan 8 '13 at 15:23

cgohlke

7,67012424

answered Jan 8 '13 at 15:23

cgohlke

7,67012424

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 |

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Tukukkk