LS-DYNA FAQ

We provide modules to setup the basic environment for using LS-DYNA on our systems. This includes adding LS-DYNA commands to your PATH variable and setting the necessary environment variables for the LS-DYNA license. If you do not wish to use the modules environment, the following environment variables MUST be set for LS-DYNA licensing to function properly on hydra:

For ksh/bash shells:

export LSTC_FILE=/usr/local/lstc/LSTC_FILE 
export LSTC_LICENSE=network 
export LSTC_LICENSE_SERVER=sclserver-private

For csh/tcsh shells:

setenv LSTC_FILE /usr/local/lstc/LSTC_FILE 
setenv LSTC_LICENSE network 
setenv LSTC_LICENSE_SERVER sclserver-private

Commands for LS-DYNA

System(s)	Version	Command
hydra	MPI, Single Precision	ls-dyna-mpi
hydra	MPI, Double Precision	ls-dyna-mpi_d
hydra	OpenMP, Single Precision	ls-dyna
hydra	OpenMP, Double Precision	ls-dyna_d

Command Line Options for LS-DYNA

Option	Description
i=inputfile	Specifies the name of the input file.
o=outputfile	Specifies the name of the output file.
ncpu=X	Specifies X cpus for shared memory LS-DYNA. Note, this option should be used only with the OpenMP version of LS-DYNA.
memory=XXX memory=XXXm	Specifies NNN words of memory. The argument for this option may also be specified in megawords as XXXm. A word is 4 KB while a megaword is 4 MB for LS-DYNA single precision. For double-precision LS-DYNA, a word is 8 KB while a megaword is 8 MB.

Serial Example With LS-DYNA

This is an example of using single-precision LS-DYNA using 100 megawords (400 MB):

ls-dyna i=input.k o=outputfile memory=100m

Examples Using LS-DYNA with Multiple CPUs

These examples assume that you have already loaded the appropriate environment module for LS-DYNA or have manually set up your environment for LS-DYNA properly.

This is an example of using single-precision LS-DYNA using 4 MPI tasks and 100 megawords (400 MB) per MPI task on hydra with the ksh shell:

poe ls-dyna-mpi i=input.k o=outputfile ncpu=4 memory=100m

This is an example of using single-precision LS-DYNA using 4 OpenMP threads and up to 100 megawords (400 MB) on hydra with the ksh shell:

export OMP_NUM_THREADS=4
# This environment variable is mandatory for OpenMP LS-DYNA on AIX
export AIXTHREAD_SCOPE=S                             
ls-dyna i=input.k o=outputfile ncpu=4 memory=100m