Update ICON.md

ICON.md

@@ -102,8 +102,9 @@ ICON can be downloaded and used under a [personal non-commercial research licens
     (mypy36) [serafin@jet01 icon-2.6.6]$ mkdir jet
     (mypy36) [serafin@jet01 icon-2.6.6]$ cd jet/
     (mypy36) [serafin@jet01 jet]$ ln -s ../configure .
-    (mypy36) [serafin@jet01 jet]$ /jetfs/home/serafin/ICON/icon-2.6.6/config/univie/jet.ifort.sh
+    (mypy36) [serafin@jet01 jet]$ srun --mem=20G ../config/univie/jet.ifort.sh
     ```
+    Why the `srun --mem=20G`? Because this way the configuration script runs on the compute nodes of `jet` and has enough memory to run simple test programmes (actually, it could work with a lot less than 20G). This is necessary because the configuration script makes some tests to see if the MPI environment (in particular `mpirun`) works correctly; with the default settings on `jet`, this is the case only on the compute nodes.
 
 1. Compile the code by running the following in the build directory (`-j8` is optional, it's only about running multiple compile jobs in parallel):
     ```sh