== Getting an account ==

You automatically have access to the Babylon machine if you are part of Dartmouth's Thayer School of Engineering. To request access to Amundsen, please send an email to Helene Seroussi.

== ssh configuration ==

Babylon is actually a cluster of 12 independent servers, so you need to first choose on which one you are going to log in. 
The status of the cluster usage can be found here : https://cluster-usage.thayer.dartmouth.edu/.

You can add the following lines to `~/.ssh/config` on your local machine:
{{{
#!sh
Host babylon babylon?.thayer.dartmouth.edu
   Hostname babylon?.thayer.dartmouth.edu
   User USERNAME

}}}
and replace `USERNAME` by your Dartmouth NetID, which is your username.

Once this is done, you can ssh discovery by simply doing:

{{{
#!sh
ssh babylonX 
}}}

with X the number of the machine you want to access

== Password-less ssh ==

This machine does not support public key authentification

== Environment ==

On babylon, add the following lines to `~/.bashrc`:
{{{
#!sh
export ISSM_DIR=PATHTOTRUNK
source $ISSM_DIR/etc/environment.sh
alias ma='matlab -nodesktop -nosplash -r "addpath $ISSM_DIR/src/m/dev; devpath;"'
}}}

''Log out and log back in'' to apply this change.

== Installing ISSM on babylon ==

Babylon has both Intel and GNU compilers. Installation should be done with the Intel compilers. You can follow the instructions on the website [http://issm.jpl.nasa.gov/download/unix/]. Choose Petsc v3.15 or later (install-3.15-babylon.sh). You should not need Python.

Use the following configuration script (adapt to your needs):

{{{
#!/bin/bash
./configure \
   CC=icc CXX=icpc F90=ifort FC=ifort \
   --prefix=${ISSM_DIR} \
   --with-numthreads=2 \
   --with-matlab-dir="/thayerfs/apps/matlab/" \
   --with-mpi-include="${ISSM_DIR}/externalpackages/petsc/install/include" \
   --with-mpi-libflags="-L${ISSM_DIR}/externalpackages/petsc/install/lib -lmpifort -lmpi" \
   --with-metis-dir="${ISSM_DIR}/externalpackages/petsc/install" \
   --with-parmetis-dir="${ISSM_DIR}/externalpackages/petsc/install" \
   --with-blas-lapack-dir="${ISSM_DIR}/externalpackages/petsc/install" \
   --with-scalapack-dir="${ISSM_DIR}/externalpackages/petsc/install" \
   --with-mumps-dir="${ISSM_DIR}/externalpackages/petsc/install" \
   --with-petsc-dir="${ISSM_DIR}/externalpackages/petsc/install" \
   --with-triangle-dir="${ISSM_DIR}/externalpackages/triangle/install" \
   --with-m1qn3-dir="${ISSM_DIR}/externalpackages/m1qn3/install" \
   --enable-debugging \
   --enable-development
}}}