Error when installing mpi4py

Question

I'm trying to install mpi4py using pip install mpi4py, but I'm getting the following error:

error: Cannot find 'mpi.h' header. Check your configuration!!!

Earlier in the same error report I have,

clang: error: linker command failed with exit code 1 (use -v to see    invocation)

What might the problem be?

Thanks!

Tatianatatianas

What commands do you execute? Do you have MPI installed? – Ancilin

what is os x-specific about this? – Brodeur

Answer 1

As the error says, there are libraries missing. I solved it by installing libopenmpi-dev package

sudo apt-get install libopenmpi-dev

and then installed the mpi4py using pip

pip install mpi4py

Loudmouth

Note that this question was tagged osx and apt implies debian/ubuntu/related variants (but not saying this answer is bad) – Armidaarmiger

Please don't do sudo pip install XXX – Balkan

I am in a machine without sudo permissions. Yet I have conda. In that case, @9Dragons' answer solves it. conda install -c conda-forge mpi4py mpich – Flint

Answer 2

I met with the similar problem and fixed this by firstly

brew install mpich

And then

pip install mpi4py

Fix

Answer 3

you can do this:

brew install mpich

then

sudo find / -name mpicc

finally

env MPICC=/yourpath/mpicc pip3 install mpi4py

Karlmarxstadt

The second step was not necessary in my case. – Ingraft

Answer 4

None of the above solutions worked for me. I just use the conda install:

brew install mpich

conda install mpi4py

Baklava

Answer 5

If mpi4py cannot find mpi.h, then likely the problem is how you are pointing mpi4py to your existing mpi library.

$ python setup.py build --mpicc=/where/you/have/mpicc

Now, there there are a few special cases related to OS X. You should consult http://mpi4py.scipy.org/docs/usrman/install.html to see if any apply to you.

Brodeur

if you want to use pip, you can do: env MPICC=/path/to/mpicc/ pip install mpi4py – Vadim

Answer 6

in my case, all solutions above is failed but succeded by conda

conda install -c conda-forge mpi4py mpich

Overcritical

Answer 7

If somebody stumbles by and has the same problem I had:

I wanted to install mpi4py using pip as root:

sudo pip install mpi4py

I got the error message that mpi.h was missing during the installation. The path was set correctly, but only for my user, not for root. So if you run into trouble with missing libraries/headers during any installation, make sure the correct environment is also set up for root.

As I use mpi-selector to select which mpi implementation you use, I just had to run mpi-selector as root to set up everything correctly, and the installation succeeded.

Justicz

mpi.h is a header file and LD_LIBRARY_PATH is for libraries. The issue was more likely with your $PATH (e.g. mpicc and friends were not in your default path) – Toxoplasmosis

Answer 8

I have the similar issue, the following helps me as well.

sudo apt install libopenmpi-dev

Demulsify

Answer 9

This might help on Fedora 38:

sudo dnf install python3-mpi4py-mpich python3-mpi4py-openmpi # second one not necessary I guess
module load mpi/mpich-$(arch)
pip3 install mpi4py

Mentioned here = https://mpi4py.readthedocs.io/en/latest/install.html2

Bluebell

Answer 10

first post here and new to python , sorry if im off topic.

i finally installed mpi4py

1) by downloading the right version from here https://www.lfd.uci.edu/~gohlke/pythonlibs/#mpi4py

2) open cmd ,change directory to where the downloaded file is

3) pip install some-package.whl ( How do I install a Python package with a .whl file? )

Subchloride

Hi @Frikg, welcome to Stack Overflow. Indeed, your answer doesn't seem to be addressing the specific problem that the original poster had, and seems offtopic! – Henceforward

hi @Henceforward , you are right . I 've been searching for days to install it so i hope that someone who has the same issue with me will come across with my answer (title helps to easy find this post) :) – Subchloride