What are batch licenses and how can I use them?

Description

What are Batch Licenses?

The license file for COMSOL Multiphysics® contains a list of license features that correspond to the different COMSOL products and software components. With a single Floating Network License, you will see that in the license file there are two lines with license features corresponding to each product: the regular license feature and one ending in BATCH. For example, for COMSOL Multiphysics® there are COMSOL and COMSOLBATCH, and for the RF Module there are RF and RFBATCH.

The purpose of the batch licenses is to enable users to only use a single Floating Network License for simultaneously running batch jobs on a more powerful computer (or a cluster) and working with a model in the COMSOL Multiphysics® user interface (UI) on their local computer.

How Do I Use Batch Licenses?

Depending on how you launch your jobs on a computer or cluster, the approach to make sure that the batch licenses are used varies.

From the UI

If you have a Cluster Computing node or a Cluster Sweep node in your study, there is a check box called Use batch license. Selecting that check box will ensure that the batch licenses are used when the study is computed.

From the Command Line

Add the -usebatchlic option to the COMSOL command.

comsol batch -usebatchlic -inputfile model.mph -outputfile out.mph -batchlog model.mph.log

In a Submission Script

Add the -usebatchlic option to the COMSOL command.

#!/bin/bash  
# slurmsubmit.sh    

#SBATCH --nodes=2  
#SBATCH --ntasks-per-node=2  
#SBATCH --exclusive  
#SBATCH -D "/srv/data/comsol61/bin"  
#SBATCH -o "${HOME}/logs/slurm.out"  
#SBATCH -e "${HOME}/logs/slurm.err"  

# To use the batch license, add the -usebatchlic option to the COMSOL command:
comsol batch -usebatchlic -mpibootstrap slurm -inputfile model.mph -outputfile out.mph -batchlog model.mph.log

Note on Version Compatibility

When a model is built and solved on different computers, it is recommended to use the same COMSOL version and update (build number) on both machines. If this is not possible, then the model can instead be saved right before solving. The Cluster Computing and Cluster Sweep nodes handle this automatically. On the command line or in a script, this can be done manually:

comsol batch -usebatchlic -norun -inputfile model.mph

comsol batch -usebatchlic -inputfile model.mph ...

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