OpenMPI Raspberry Pi

Downloading OpenMPI and getting it up and running on a Raspberry Pi

This was done using CentOS on the RPi. You'll need some type of internet connection.

sudo yum install wget
wget "Link of what you want to download"

I used this link: https://www.open-mpi.org/nightly/master/ . Hover your mouse over the tarball at the top with the extension .gz.tar and in the bottom left hand corner you'll see a full link for this download. Put it in quotes in front of wget.

mv /home/tarballName /home/whatEverDirectoryYouWish      (It might not be necessary to move this file)
gunzip openmpi-master-X-Y.tar.gz
tar -xvf openmpi-master-X-Y.tar

If you have to change the date on the Pi:

timedatectl set-time 'YYYY-MM-DD HH:MM:SS'

________________________________________________________________________________________________

To enable dynamic linking and run tests: Both of these commands might take some time

./configure
sudo make install    
sudo yum install {Packages}

Attempt to install all these packages: gcc, libtool automake autoconf, open-ssl, openssl, openssl-devel, gcc-g++, gcc-c++, gcc-fortran, man, gdb

cd intoTheTarballFolder
cd examples
mpicc hello_c.c -o hello_c
./hello_c
ldd ./hello_c

which mpirun
mpirun -np 3 {optionalCommands} ./hello_c

optionalCommands: --display-map, --oversubscribe (Allows you to add more jobs than there are cores)

____________________________________________________________________________________________________________

To enable static linking and run tests: Both of these commands might take some time

./configure --enable-static
sudo make install
sudo yum install zlib-static
sudo yum install glibc-static

cd intoTheTarballFolder
cd examples
mpicc -static hello_c.c -o hello_c
./hello_c
ldd ./hello_c

which mpirun
mpirun -np 3 {optionalCommands} ./hello_c

optionalCommands: --display-map, --oversubscribe (Allows you to add more jobs than there are cores)