ImportError: DLL load failed: The specified module could not be found.

[sampath methuku]

form mpi4py import MPI
comm = MPI.COMM_WORLD

rank = comm.Get_rank()
N = 100000000
if rank == 0:
s = sum(range(N/2))
comm.send(s,dest=2,tag=11)
elif rank == 1:
s = sum(range(N/2+1,N))
comm.send(s,dest=2,tag=11)
elif rank == 2:
s1 = comm.recv(source=0, tag=11)
s2 = comm.recv(source=1, tag=11)
print (s1+s2)


i want find the sum of 10000000 numbers parallely . i am doing sum of
first half in core 1, second half in core 3
on core 2 summing the results of core 1 and 3
but on windows by running on python 3.2 i am getting following
error

from mpi4py import MPI
ImportError: DLL load failed: The specified module could not be found.


please give me the solution for this error

[Lisandro Dalcin]

You have not provided us any useful information to figure out what's
going on in your system... What MPI implementation are you using? What
compiler did you use to build mpi4py? Please note that I do not have
too much Windows expertise. Perhaps using this tool to figure out
what's the missing DLL will help you: http://www.dependencywalker.com/

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[michael...@gmail.com]

Hi there, I am having the same problem.

I have Open MPI v1.6.2-x64 and mpi4py v2.0.0 installed.

How would you recommend using the dependancywalker program to identify which DLLs are missing?

Should I point it to one of the OpenMPI executables?

Kind regards

Michael

[Aron Ahmadia]

How did you install mpi4py?  Is your LD_LIBRARY_PATH environment path set?  Can you try running the code without LD_LIBRARY_PATH set?

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[Lisandro Dalcin]

I guess you are using Windows, right? How did you install mpi4py? If
you used pip, then note that "pip install mpi4py" will install a
binary wheel built to work with Microsoft MPI v6 (but I guess using
the latest MSMPI v7 should work).

As both MPICH and OpenMPI have discontinued their support for the
Windows platform, I do not officially support building mpi4py with
these MPI implementations. It should be possible, but you are somewhat
at your own.

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[Michael Kruger]

Hi Lisandro.

Yes, I am on Windows and I installed mpi4py using pip.

So I tried to resolve the problem. First I noticed that I didn't have cl.exe anywhere on my computer so I installed Visual Studio Express to get access to this, and put in in my system path.

So now anywhere I am on my computer when I run "mpicc" in cmd I get:

Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

Copyright (C) Microsoft Corporation.  All rights reserved.

usage: cl [ option... ] filename... [ /link linkoption... ]

Which tells me I have access to openMPI and openMPI has access to cl.exe.

But still getting the "DLL not found" error in Python.

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Groete/Regards

Michael Kruger

[michael...@gmail.com]

Hi Aaron. I am not sure if the LD_LIBRARY_PATH is set, I am not exactly sure what it is even to be honost. Please see my reply to Lisandro for what I so far.

Regards.

On Tuesday, March 27, 2012 at 7:54:04 PM UTC+2, sampath methuku wrote:

[Yury V. Zaytsev]

On Wed, 2015-12-16 at 07:42 +0200, Michael Kruger wrote:
>
> Which tells me I have access to openMPI and openMPI has access to
> cl.exe.

So, any particular reason to stick to unsupported OpenMPI instead of
Microsoft MPI, given the fact that you're on Windows anyways?

--
Sincerely yours,
Yury V. Zaytsev

[Michael Kruger]

Hi Yury.

The only reason would be ignorance. I'm not yet very familiar with anything parallel processing.

I will check out Microsoft MPI, thanks for the suggestion!

Cheers.

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[Yury V. Zaytsev]

On Thu, 2015-12-17 at 08:41 +0200, Michael Kruger wrote:
>
> I will check out Microsoft MPI, thanks for the suggestion!

Ok, I see, in that case, I definitively recommend you

1) Uninstalling OpenMPI
2) Uninstalling mpi4py
3) Installing Microsoft MPI
4) Re-installing mpi4py with pip so that a wheel gets installed

In theory, after that, it should just work out of the box, even without
requiring a working compiler.

[Michael Kruger]

Great, that worked!

Thank you very much.

Regards

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