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C&IT Computing & Information Technology

How to Run a LS-DYNA Job

Follow these steps to run a LS-DYNA job.

1. Log in to the Grid.

2. From your home directory, copy the supporting tutorial file by typing: cp /wsu/el7/scripts/tutorial/tensile.k .

3. Create the job script. Type: vim jobscript

Press the i key to edit. The following is the contents of a sample job script, enter and edit it as necessary:

#!/bin/bash

# Job name

#SBATCH --job-name=lsdyna

# Submit to the primary QoS

#SBATCH -q primary

# Number of nodes

#SBATCH -N 1

# Request a node with intel

#SBATCH --constraint=intel

# Number of cores

#SBATCH -c 4

# Request memory

#SBATCH --mem=12G

# Mail when the job begins, ends, fails, requeues

#SBATCH --mail-type=ALL

# Where to send the email alerts

#SBATCH --mail-user=xxyyyy@wayne.edu

# Create an output file that will be output_<jobid>.out

#SBATCH -o output_%j.out

# Create an error file that will be error_<jobid>.out

#SBATCH -e errors_%j.err

# Set a maximum time limit

#SBATCH -t 4:0:0

ml ls-dyna

ls-dyna-d i=tensile.k ncpus=4 > outputfile.txt

Press the Esc key and type :wq and then Enter to save and quit.

4. Submit the job: sbatch jobscript

5. The job is submitted. You can check to see the status of the job and what node it is running on by typing: qme

Once the job runs the output can be found in the output.file.txt.

Troubleshooting

1. If you receive an error similar to the following:

*** Error 70021 (OTH 21)

Memory is set 83183390 words short

Memory size is 200000000

Increase the memory size by one of the following

where ##### is the number of words requested:

1) On the command line set - memory=#####

2) In the input file define memory with *KEYWORD

i.e., *KEYWORD ##### or *KEYWORD memory=#####

Then ls-dyna needs more memory. Add 83183390 to 200000000, which produces 283183390. Round up to the next highest value which will be 300000000 and use that for your memory value: i=tensile.k ncpus=4 memory=300000000 > outputfile.txt

Note: This may happen several times a LS-DYNA moves through your setup.

2. If you receive an error with the word Killed then a new job needs to be requested with more memory. To calculate the memory needed in GB for the above example go to this site: https://deviceanalytics.com/memcalc/

  • Select 64-bit
  • Enter 300000000 in the WORDS section
  • BYTES provides 2.24 which is 2.24 GB, you should then round up to 3 GB.

Modify the memory requested in this line to what is required: #SBATCH --mem=12G