COMSOL

To load the default version of COMSOL module, use  module load comsol . To select a particular software version, use   module load comsol/version . For example, use  module load comsol/52a  to load COMSOL version 5.2a. 

When you log into owens.osc.edu you are actually logged into a linux box referred to as the login node. To gain access to the mutiple processors in the computing environment, you must submit your analysis to the batch system for execution. Batch jobs can request mutiple nodes/cores and compute time up to the limits of the OSC systems. Refer to Queues and Reservations and Batch Limit Rules for more info. 

Interactive Batch Session

For an interactive batch session, one can run the following command:

sinteractive -A <project-account> -N 1 -n 28 -t 1:00:00 -L comsolscript@osc:1

which gives you 28 cores ( -N 1 -n 28 ) with 1 hour ( -t 1:00:00 ). You may adjust the numbers per your need.

Non-interactive Batch Job (Serial Run)

Assume that you have had a comsol script file  mycomsol.m  in your working direcory ( $SLURM_SUBMIT_DIR ). Below is the example batch script ( job.txt ) for a serial run: 

#!/bin/bash
#SBATCH --time=1:00:00
#SBATCH --nodes=1 --ntasks-per-node=1
#SBATCH -L comsolscript@osc:1
#SBATCH --account=<project-account>
#
# The following lines set up the COMSOL environment
#
module load comsol
#
# Use TMPDIR for best performance
cp -p mycomsol.m $TMPDIR
cd $TMPDIR
#
# Run COMSOL
#
comsol batch mycomsol
#
# Now, copy data (or move) back once the simulation has completed
#
cp -p * $SLURM_SUBMIT_DIR

Non-interactive Batch Job (Parallel Run for COMSOL 6.0 and Later)

Below is the example batch script for a parallel job using COMSOL 6.0 or later versions:

#!/bin/bash
#SBATCH --time=1:00:00
#SBATCH --nodes=2 --ntasks-per-node=4 --cpus-per-task=7
#SBATCH -L comsolscript@osc:1
#SBATCH --account=<project-account>

module load comsol
echo "--- Copy Input Files to TMPDIR and Change Disk to TMPDIR"
cp input_cluster.mph $TMPDIR
cd $TMPDIR

echo "--- COMSOL run"
comsol batch -mpibootstrap slurm -inputfile input_cluster.mph -outputfile output_cluster.mph
echo "--- Copy files back"
cp output_cluster.mph output_cluster.mph.status ${SLURM_SUBMIT_DIR}
echo "---Job finished at: 'date'"
echo "---------------------------------------------"

Note:

• Use the "-mpibootstrap slurm" option to take the resource specification from the SBATCH directives, thus eliminating the -nnhost, -nn, and -np options.  For more details see https://www.comsol.com/support/knowledgebase/1001
• Copy files from your directory to $TMPDIR.
• Provide the name of the input file and output file.

OLD Non-interactive Batch Job (Parallel Run for COMSOL 4.3 and Later)

As of version 4.3, it is not necessary to start up MPD before launching a COMSOL job. Below is the example batch script ( job.txt ) for a parallel run using COMSOL 4.3 or later versions:

#!/bin/bash
#SBATCH --time=1:00:00
#SBATCH --nodes=2 --ntasks-per-node=28
#SBATCH -L comsolscript@osc:1
#SBATCH --account=<project-account>

module load comsol
echo "--- Copy Input Files to TMPDIR and Change Disk to TMPDIR"
cp input_cluster.mph $TMPDIR
cd $TMPDIR

echo "--- COMSOL run"
comsol -nn 2 batch -mpirsh ssh -inputfile input_cluster.mph -outputfile output_cluster.mph
echo "--- Copy files back"
cp output_cluster.mph output_cluster.mph.status ${SLURM_SUBMIT_DIR}
echo "---Job finished at: 'date'"
echo "---------------------------------------------"

Note:

• Set nodes to 2 and ppn to 28 ( --nodes=2 --ntasks-per-node=28). You can change the values per your need.
• Use "-mpirsh ssh" option for multi-node jobs
• Copy files from your directory to $TMPDIR.
• Provide the name of the input file and output file.

Avaliable COMSOL modules with OSC's academic license

Note: Last updated 02/05/24

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