Installation linux

Installing the relax dependencies

The python-devel and scons packages are only required if the C modules need to be compiled for your system.

• Grace software is used for visualisation of 2D data sets.
• subversion is only if you wan't to checkout the source code.
• matplotlib is not a necessity, but is likely to be implemented later for extended plotting.

RHEL 5 and compatible distributions

For RPM-based Linux distributions with access to the YUM installer, first install the relax dependencies with:

yum install python
yum install python-devel
yum install numpy
yum install scipy
yum install scons
yum install wxPython
yum install grace
yum install subversion
yum install python-matplotlib

If you do not have root access but are in the sudo group, then add a sudo before each of the above commands.

Minfx and Bmrblib

Remember to check, if there are newer versions of minfx and bmrblib.
The minfx and bmrblib libraries can be installed on all Linux systems by typing:

cd $HOME/Downloads

wget http://download.gna.org/minfx/minfx-1.0.5.tar.gz
tar -xzf minfx-1.0.5.tar.gz
cd minfx-1.0.5
sudo python setup.py install
cd ..

wget http://download.gna.org/bmrblib/bmrblib-1.0.3.tar.gz
tar -xzf bmrblib-1.0.3.tar.gz
cd bmrblib-1.0.3
sudo python setup.py install
cd ..

mpi4py

Relax can run some optimizations with multi-processors. See the manual.
It needs openmpi-devel and the python package mpi4py.

Remember to check, if there are newer versions of mpi4py.
The mpi4py libraries can be installed on all Linux systems by typing or check instructions here.:

# Install openmpi-devel, to get 'mpicc'
sudo yum install openmpi-devel
# Check for mpicc
which mpicc
# If not found, try this fix, ref: http://forums.fedoraforum.org/showthread.php?t=194688
#For 32 computer.
sudo ln -s /usr/lib/openmpi/bin/mpicc /usr/bin/mpicc
# For 64 bit computer.
sudo ln -s /usr/lib64/openmpi/bin/mpicc /usr/bin/mpicc
# Source your shell settings, to find the executable, or restart your terminal.
source $HOME/.cshrc

# Then install mpi4py
cd $HOME/Downloads
wget https://bitbucket.org/mpi4py/mpi4py/downloads/mpi4py-1.3.1.tar.gz
tar -xzf mpi4py-1.3.1.tar.gz
cd mpi4py-1.3.1
python setup.py build
sudo python setup.py install

Testing the Python installation

Before installing relax, it is best to be sure that the Python modules are functional by importing them:

$ python
Python 2.6.6 (r266:84292, Oct 12 2012, 14:23:48)
[GCC 4.4.6 20120305 (Red Hat 4.4.6-4)] on linux2

>>> import wx
>>> wx.__file__
'...'

>>> import bmrblib
>>> bmrblib.__file__
'...'

>>> import minfx
>>> minfx.__file__
'...'

>>> import mpi4py
>>> mpi4py.__file__
'...'

Checking out a relax branch

If you would like to play with relax branch rather than the main relax downloads, the Subversion program should first be installed.
You can see the different branches here.
First the relax sources can be checked out of the source code repository and the C modules compiled:

Using subversion

To check out the relax_disp or trunk branch using the subversion client, simply type:

svn co svn://svn.gna.org/svn/relax/branches/relax_disp relax_disp
svn co svn://svn.gna.org/svn/relax/trunk relax_trunk

If this svn command does not work, try:

svn co http://svn.gna.org/svn/relax/branches/relax_disp relax_disp
svn co http://svn.gna.org/svn/relax/trunk relax_trunk

Compilation of the C modules

For the R1 and R2 and relaxation dispersion analyses, the relax C modules must be compiled. This is done using the scons program, by simply typing:

cd relax_disp
scons

You must be in the base relax directory for this to work.

In addition, if you would like to compile the relax user manual via LaTeX, you can also use scons. See the wiki page manual.:

Add to path - C_shell / Tcsh

cd relax_disp
echo "setenv PATH $PWD"':$PATH' >> $HOME/.cshrc

Restart the terminal, to load the new variables.

Start relax

Normal

# Normal
relax
# See help
relax -h
# In GUI mode
relax -g
# Execute script
relax -g

In multiprocessor mode

set RELAX=`which relax`
# Normal
mpirun -np N+1 $RELAX -multi='mpi4py'
# In gui
mpirun -np N+1 $RELAX -multi='mpi4py' -g

where N is the number of slaves you have. See the mpirun documentation for details - this is not part of relax.
This code runs in the GUI, the script UI and the prompt UI, i.e. everywhere.

TEST INSTALLATION

After an installation you should really run an Installation_test

Trouble shooting

The menu icons are missing in Linux.

On some Linux systems, the icons for the menu items are not shown. This was a decision taken by the Gnome developers at some point to keep the GUI minimal, though in recent versions this behaviour has been reverted.
If you suffer from this problem, to reactive the icons simply type in the shell:

gconftool-2 --type boolean --set /desktop/gnome/interface/menus_have_icons true