Installation of OpenMPI

OpenMPI is an open source MPI-2 implementation that is developed and maintained by a consortium of academic, research, and industry partners. Open MPI is therefore able to combine the expertise, technologies, and resources from all across the High Performance Computing community in order to build the best MPI library available.

You can download the last version from it's official page:

http://www.open-mpi.org/Prerequisites:

• It is necessary to have installed a C/C++/Fortran compiler before installing OpenMPI. Installing this on Ubuntu by package manager will automatically resolve this problem.

• It is necessary to have the “make” utility for manual installation. Quick install for Ubuntu (Debian, Linux/Unix)Here we will explain how to install it only for Ubuntu and similar OS. If you don't use it or you are not sure, please consider the next step, the manual installation. Necessary packages are: openmpi-bin:

Parallel code executor program (mpirun).Installs: openmpi-common libopenmpi1.3openssh-client, openssh-server:

Communicating programs (control and presentation routines)between processes.libopenmpi-dbg:

Debug information generator for MPI.libopenmpi-dev: Necessary to develop parallel programs based on MPI (mpicc command...).

Quick command:

sudo apt-get install openmpi-bin openmpi-common openssh-client openssh-server libopenmpi1.3libopenmpi-dbg libopenmpi-dev

Please note that if you are using Ubuntu, it will automatically install a C/C++ compiler, and it will check for compatibilities and installed components.

Manual install for any linux distributionStart downloading the last version of OpenMPI from it's official page:http://www.open-mpi.org/software/ompiHere you'll be able to downlad a version on tar.gz, tar.bz2 or on rpm. If your system supports rpmthis is the package you should download, if this is the case, you'll only have to install it without anyof the following steps (usually double-clicking).If your system does not support rmp, follow the next steps:

1.Decompress the downloaded file (should be called something like openmpi-x.x.x.tar.xxx,changing x.x.x for the version downloaded):tar -xvf openmpi-*

2.Go into the new folder created from the decompress.cd openmpi-*

3.Configure the installation file (making use of the superuser privileges of your system) and start preparing a cup of coffee, because this task usually takes between 5 and 10minutes.

It is necessary to add on the prefix the installation directory we want to use for OpenMPI. The normal thing to do would be to select the next directory “/home/<user>/.openmpi”../configure --prefix="/home/$USER/.openmpi"

4.Now is the time for the hard work, install it. For it, we'll make use of the “make” tool. This is a good moment for the coffee, this should take between 10 and 15 minutes, so let it work.

make 

sudo make install

5.All that is left to do is to include the path to our path environment the path“installation_directory/bin” and to the library environment variable“installation_directory/lib/”. If your system uses bash you'll have to use the commandexport.export PATH="$PATH:/home/$USER/.openmpi/bin"export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/$USER/.openmpi/lib/"1.If you want the exportation to be effective for the next sessions and terminals, you'll have to write the exports in the environment variable's file. By default it should be“/home/<user>/.bashrc” for bash users.echo export PATH="$PATH:/home/$USER/.openmpi/bin" >> /home/$USER/.bashrc echo export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/$USER/.openmpi/lib/">> /home/$USER/.bashrc

If everything went Ok, when you run the command mpirun it'll show the “how to use” message, thesame for mpicc.Some common errors•“I'm on an Ubuntu modern system or compatible and when I run the quick command to install it says it doesn't find openmpi-lib”If you are sure your OS should have this package, the error is surely because you don't have your repositories updated. A way of doing this is, if you are using “apt” (Advanced Packaging Tool),running the next command:sudo apt-get update•“On step 3, configure gave me an error.”If the error it gave is something like the next:

This is because you don't have installed any compiler. It's necessary to install all the compilers we want to use before installing OpenMPI. To use it with C and C++, we strongly recommend GNUgcc/g++ compiler version 4.4 or superior.•“When I run the command MPIRUN or MPICC an error tells me that no file was found”Please make sure the environmental variables configuration (Step 5 on manual installation). In case you made tha automatic installation, we recommend to restart the computer, if this doesn't work,you can always do step 5 manually. By default the paths are “/usr/include/openmpi/” for PATH and“/usr/lib/openmpi/lib” for LD_LIBRARY_PATH).

OpenMPI

1) tar zxvf openmpi-1.10.3.tar.gz

2) cd openmpi-1.10.3

3) gfortran and gcc case ./configure -prefix=/usr/local/openmpi CXX=g++ CC=gcc FC=gfortran Intel Compiler case ./configure -prefix=/usr/local/openmpi CXX=icpc CC=icc FC=ifort or ./configure -prefix=$HOME/openmpi CXX=icpc CC=icc FC=ifort or ./configure -prefix=/usr/local/openmpi CXX=g++ CC=gcc FC=ifort or ./configure -prefix=$HOME/openmpi CXX=g++ CC=gcc FC=ifort 4) make 5) sudo make all install make all install (-prefix=$HOME/openmpi case) 6) gedit $HOME/.bahsrc ---------- # openmpi-1.10.3 export MPIROOT=/usr/local/openmpi export PATH=$MPIROOT/bin:$PATH export LD_LIBRARY_PATH=$MPIROOT/lib:$LD_LIBRARY_PATH export MANPATH=$MPIROOT/share/man:$MANPATH