Compile and execute CLaMS programs on JUROPA

Compilation

All used libraries and module files are linked to:

• /lustre/jhome47jicg11/jicg1108/clams_lib
  /lustre/jhome47jicg11/jicg1108/clams_mod

The CLaMS makefiles are adjusted for compilation of CLaMS programs on JUROPA with the Intel compiler (mkincl/config/config.Linux_ifc).

The netCDF version 3.6.3 is used. For using netCDF 4 see Used Libraries (netCDF3/netCDF4).

The CLaMS programs can be compiled with:

• gmake useComp=ifc [useMPI=true] progname

Create batch script

Write a batch script including the mpiexec command for the just compiled executable:

• #MSUB -l nodes=<no of nodes>:ppn=<no of procs/node>
  #MSUB -l walltime=<hh:mm:ss>
  #MSUB -e <full path for error file>
  #MSUB -o <full path for output file>
  
  ### start of jobscript
  cd $PBS_O_WORKDIR
  echo "workdir: $PBS_O_WORKDIR"
  NP=$(cat $PBS_NODEFILE | wc -l) # nodes*ppn
  echo "running on $NP cpus ..."
  mpiexec -np $NP <executable>

Job Limits

Batch jobs

• max. number of nodes: 256 (default: 1)
• max. wall-clock time: 12 hours (default: 30 min)

Interactive jobs:

• max. number of nodes: 2 (default: 1)
• max. wall-clock time: 30 min (default: 10 min)

Submit job

Submit the job with:

• msub <jobscript>

On success msub returns the job ID of the submitted job.

Useful commands

• checkjob -v <jobid>
  get detailed information about a job

• showq [r]
  show status of all (running) jobs

• canceljob <jobid>
  cancel a job

• mjobctl -q starttime <jobid>
  show estimated starttime of specified job

• mjobctl --help
  show detailed information about this command

Interactive Session

• Allocate interactive partition with X11 forwarding:

  msub -I -X -l nodes=#:ppn=8

  possible number of nodes: 1 or 2
• Start your applications
• Deallocate interactive partition with:

  exit