| 1 | {{{ |
| 2 | #!html |
| 3 | <h1>How to use the IPSL models and tools at LSCE</h1> |
| 4 | }}} |
| 5 | ---- |
| 6 | [[PageOutline(1-2,Index du chapitre,,numbered)]] |
| 7 | |
| 8 | 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. |
| 9 | |
| 10 | * The interactivity |
| 11 | |
| 12 | 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'''. |
| 13 | |
| 14 | 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. |
| 15 | |
| 16 | * The computing cluster |
| 17 | |
| 18 | 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'''. |
| 19 | |
| 20 | ## Modipsl and compiling ## |
| 21 | '''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]] |
| 22 | |
| 23 | |
| 24 | You must modify the makefile '''to run in sequential mode'''. To do so change the following lines in modipsl/util/AA_make.gdef |
| 25 | {{{ |
| 26 | #-Q- lxiv8 F_C = mpif90 -c -cpp |
| 27 | #-Q- lxiv8 F_O = -DCPP_PARA -O3 $(F_D) $(F_P) -I$(MODDIR) -module $(MODDIR) |
| 28 | #-Q- lxiv8 F_L = mpif90 |
| 29 | }}} |
| 30 | |
| 31 | in |
| 32 | |
| 33 | {{{ |
| 34 | #-Q- lxiv8 F_C = ifort -c -cpp |
| 35 | #-Q- lxiv8 F_O = -O $(F_D) $(F_P) -I$(MODDIR) -module $(MODDIR) |
| 36 | #-Q- lxiv8 F_L = ifort |
| 37 | }}} |
| 38 | |
| 39 | Then recreate the makefile with ./ins_make and compile as usual. |
| 40 | |
| 41 | ## libIGCM and environment ## |
| 42 | |
| 43 | libIGCM can be used on the LSCE computing cluster. |
| 44 | |
| 45 | The default shell at LSCE is `tcsh`, which syntax is different from the `ksh` syntax used by libIGCM. To configure your environment correctly in order to correctly run libIGCM in `ksh`, the easiest is to copy the files `/home/users/igcmg/.bashrc` in your `$HOME`. |
| 46 | |
| 47 | ## Example of parallel MPI job ## |
| 48 | 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. |
| 49 | {{{ |
| 50 | ###################### |
| 51 | ## OBELIX LSCE ## |
| 52 | ###################### |
| 53 | #PBS -N MyTest |
| 54 | #PBS -m a |
| 55 | #PBS -j oe |
| 56 | #PBS -q medium |
| 57 | #PBS -o Script_Output_SECHSTOM.000001 |
| 58 | #PBS -S /bin/ksh |
| 59 | #PBS -v BATCH_NUM_PROC_TOT=4 |
| 60 | #PBS -l nodes=1:ppn=4 |
| 61 | |
| 62 | cd $PBS_O_WORKDIR |
| 63 | mpirun -np ${BATCH_NUM_PROC_TOT} orchidee_ol |
| 64 | }}} |
| 65 | |
| 66 | |
| 67 | To submit it you need to use the command '''qsub''', and you can follow your simulation with the command '''qstat -u login''' |