Although COMSOL is installed on the SW cluster, users will need to provide their own license before they are able to use the software.
Any given COMSOL job requires 4 components to run, namely a license key (follows the format "CMC_#####.key"), a CMC_CADPASS_BATCH_COMSOL.sh licensing script, a job script, and an input .mph file. The CMC license key and CMC_CADPASS_BATCH_COMSOL.sh script should be obtained from CMC. If CMC asks for an IP address of the machine COMSOL will be run on, give them 22.214.171.124 (this is the external IP address of the SW cluster).
Using your own license
The CMC_CADPASS_BATCH_COMSOL.sh script requires editing before it can be used. These changes are designed to allow your job scripts to be run non-interactively. Please edit the line beginning with "ssh" and replace it with the following:
ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 443 -i $CMC_KEY -L 6601:lmserver-8:6601 -L 16601:lmserver-8:16601 cpass01.cmc.ca -l $CMC_AG
As a test, verify that your license is active. To do this, run CMC_CADPASS_BATCH_COMSOL.sh with the command "./CMC_CADPASS_BATCH_COMSOL.sh <yourUID>". This will open up a connection with CMC and fetch your license status. Your UID is the numeric portion of your COMSOL key. As an example, the UID of "CMC_12345.key" would be "12345".
An active license will show the following output (type "quit" to quit):
Warning: Permanently added '[cpass01.cmc.ca]:443,[126.96.36.199]:443' (RSA) to the list of known hosts. IP access services Status CMC_COMSOL_lmgrd CMC COMSOL lmgrd (CMC Data center) Active CMC_COMSOL_vendor CMC COMSOL vendor Active Enter a service name above, or 'help' for further instructions. appgate>
If you see dashes ("-") instead of "Active", you should get in touch with CMC and ensure your license gets activated. COMSOL jobs will fail with a licensing error until this is resolved.
Redirect temporary files
COMSOL will attempt to place a large number of temporary and configuration files in your home directory and /tmp (several GB per run). This is not recommended on compute clusters, as /tmp is not shared between nodes and can fill up quickly (causing COMSOL runs to crash with a disk error), and the files it places in one's home directory may use up a significant amount of a user's disk quota under /home. To avoid this, we suggest redirecting all COMSOL tempfiles to your scratch directory. Follow these directions to setup temp file redirection (replace hpc1234 with your user name):
mkdir -p /scratch/hpc1234/comsol_scratch mv ~/.comsol/* /scratch/hpc1234/comsol_scratch # moves any existing COMSOL tempfiles to your new scratch directory rmdir ~/.comsol # if the .comsol directory exists, delete it ln -s /scratch/hpc1234/comsol_scratch ~/.comsol
Assuming all required files are in the same directory, a typical COMSOL job might look like this (replace <Your_UID> with your UID number):
#!/bin/bash #SBATCH --job-name=COMSOL_job #SBATCH --mail-type=ALL #SBATCH --mail-user=myEmail@dress.ca #SBATCH -o COMSOL-job.out #SBATCH -e COMSOL-job.err #SBATCH -N 1 #SBATCH -n 1 #SBATCH -c 12 #SBATCH -t 30:00 #SBATCH --mem=24000 module load comsol (while true; do sleep 60 ; done) | ./CMC_CADPASS_BATCH_COMSOL.sh <Your_UID> & sleep 30 comsol -np $SLURM_CORES_PER_TASK batch -tmpdir $TMPDIR -inputfile inputFilename.mph -outputfile outputFilename
Of course, this script needs to be modified to fit the individual case. Specify your email address with the --mail-user option to get notified when a job starts and finishes. The -o and -e options serve to re-direct the screeen output from COMSOL and the system, respectively. The -N and -n option specify node and process numbers and need to stay at 1 for COMSOL. -c specifies the number of cores to be allocated and sets the environment variable SLURM_CORES_PER_TASK which is passed to COMSOL.
Please consult our [short guide to the SLURM scheduler] about how to run jobs using SLURM.
Once done creating this job script, submit the job with "sbatch yourJobScriptName.sh". If you've reached this point, congratulations! You can now run COMSOL jobs on Frontenac.
A start error occured on node 11: Could_not_obtain_license_for#Cluster Node application called MPI_Abort(MPI_COMM_WORLD, 1) - process 11
Check that you have registered and activated your hpc#### username with CMC.
Could not obtain license for COMSOL Multiphysics. License error -5. No such product exists.
All of the available seats for your license have been checked out and are in use.
A start error occured on node 0: License_error_-15_Cannot_connect_to_license_server_system
The CMC_CADPASS_BATCH_COMSOL.sh licensing script will silently fail (and not connect your job to the server) unless the CMC_#####.key file is in the working directory of the job. To change this behavior, edit CMC_CADPASS_BATCH_COMSOL.sh script to point directly to the location of your key. In this case, change the line beginning with CMC_KEY to the following:
My license only works for a single node! How can I schedule multiple jobs to one machine?
Add the following line to your job script. Keep in mind that this may make your jobs considerably more difficult to schedule, as they can only be scheduled on a single node. It is a very good idea to get in touch with CAC user support before doing this, as it might otherwise be extremely difficult to pick a suitable node.
#$ -l hostname=nodeName