Changes between Version 1 and Version 2 of Doc/ComputingCenters/LSCE

Timestamp:

03/24/14 16:16:55 (10 years ago)

Author:

trac

Comment:

--

Doc/ComputingCenters/LSCE

@@ +1 @@
+{{{
+#!html
+<h1>How to use the IPSL models and tools at LSCE</h1>
+}}}
+----
+[[PageOutline(1-2,Index du chapitre,,numbered)]]
+
+The LSCE computing environment is detailed here: [https://w3.lsce.ipsl.fr/informatique/util/index.php]. You can only access this webpage via the LSCE network.
+
+ * The interactivity
+
+ The network includes a cluster for the interactive mode. This cluster is considered as a unique machine called '''asterix.lscelb.extra.cea.fr''' which can be shorten into '''asterix.lscelb'''.
+
+The direct access to the cluster is only possible from the LSCE or from the CCRT machines. The cluster can be accessed via ssh and xdmcp protocols.
+
+ * The computing cluster
+
+   The LSCE has a small computing cluster. See its users' manual here: [https://w3.lsce.ipsl.fr/informatique/util/calcul/batch.php]. This cluster is considered as a unique machine called  ''obelix.lscelb.extra.cea.fr'' which can be shorten into '''obelix.lscelb'''.
+
+## Modipsl and compiling ##
+'''By default the compiling is meant to function in MPI parallel mode.''' The compiler is `ifort` (''Intel'' compiler). The '''lxiv8''' target in modipsl/util/AA_make.gdef is used on obelix. To this day, only ORCHIDEE is installed on obelix. [[BR]]
+
+
+You must modify the makefile '''to run in sequential mode'''. To do so change the following lines in modipsl/util/AA_make.gdef
+{{{
+#-Q- lxiv8    F_C = mpif90 -c -cpp
+#-Q- lxiv8    F_O = -DCPP_PARA -O3 $(F_D) $(F_P) -I$(MODDIR) -module $(MODDIR)
+#-Q- lxiv8    F_L = mpif90
+}}}
+
+in 
+
+{{{
+#-Q- lxiv8    F_C = ifort -c -cpp
+#-Q- lxiv8    F_O = -O  $(F_D) $(F_P) -I$(MODDIR) -module $(MODDIR)
+#-Q- lxiv8    F_L = ifort
+}}}
+ 
+Then recreate the makefile with ./ins_make and compile as usual. 
+
+## libIGCM and environment ##
+
+libIGCM can be used on the LSCE computing cluster. 
+
+The default shell at LSCE is `tcsh`, which syntax is different from the `ksh` syntax used by libIGCM. To configure your environment correctly in order to correctly run  libIGCM in `ksh`, the easiest is to copy the files `/home/users/igcmg/.bashrc` in your `$HOME`.
+
+## Example of parallel MPI job ##
+Here is an example of a simple job to run the orchidee_ol executable. All input files and the executable must be in the directory before running the executable. 
+{{{
+######################
+## OBELIX      LSCE ##
+######################
+#PBS -N MyTest
+#PBS -m a
+#PBS -j oe
+#PBS -q medium
+#PBS -o Script_Output_SECHSTOM.000001
+#PBS -S /bin/ksh
+#PBS -v BATCH_NUM_PROC_TOT=4
+#PBS -l nodes=1:ppn=4
+
+cd $PBS_O_WORKDIR
+mpirun -np ${BATCH_NUM_PROC_TOT} orchidee_ol
+}}}
+
+
+To submit it you need to use the command '''qsub''', and you can follow your simulation with the command '''qstat -u login'''