The resources available for LIP users are a mix of servers from different generations and brands, as seen on the following table. The feature name tag may be used on the --constraint sbatch option to request a specific CPU type.

For example, suppose we want to target only Intel processors, then we would include the --constraint=intel option on our root example:

[uname@pauli01 mdir]$ cat MyMacro.sh
#!/bin/bash
# --------------------------------------------------------------------- #

# Select partition, or queue. The LIP users should use "lipq" partition
#SBATCH -p lipq

# Transfer input files to the execution machine
# INPUT = MyMacro.c

# Transfer output files back to submission machine
# OUTPUT= graph_with_law.pdf

# Request Intel processor
#SBATCH --constraint=intel

# --------------------------------------------------------------------- #
# Load environment
module load root/6.18.04

# Execute macro
root -b -q MyMacro.c

[uname@pauli01 mdir]$ sbatch MyMacro.sh

For example the Gate application may crash if executed on an old AMD Opteron CPU, in this case we would provide --constraint=intel option to target only Intel CPUs.

Another example, suppose we would like to target the best performant CPU nehalem, then we can simply request --constraint=nehalem.

Nodes have features assigned that stand for the supported CPU types like the ones found on the table above. For the time being only CPU type features are available but other caracteristics will be available in the near future. The request will be satisfied only by nodes having the features matching the job constraints.

Multiple constraints may be specified with AND, OR or comma, the OR operator is equivalent to comma. Check the sbatch manual page for more details: man sbatch. If no constraints are specified then the job will be eligeble to run on all CPUs or servers.