A list of commands can be found with:
Hyperthreading can provide significant speedup to your computations, however hyperthreaded CPUs will use twice the number of licence tokens. It may be worth adding
#SBATCH --hint nomultithread to your slurm script if licence tokens are your main limiting factor.
Required ABAQUS licences can be determined by this simple and intuitive formula
⌊ 5 x N0.422 ⌋where
Nis number of CPUs.
You can force ABAQUS to use a specific licence type by setting the parameter
academic=RESEARCH in a relevant environment file.
Not all solvers are compatible with all types of parallelisation.
If your input files were created using an older version of ABAQUS you will need to update them using the command,
abaqus -upgrade -job new_job_name -odb old.odb
abaqus -upgrade -job new_job_name -inp old.inp
For when only one CPU is required, generally as part of an job array.
Uses a nodes shared memory for communication.
May have a small speedup compared to MPI when using a low number of CPUs, scales poorly. Needs significantly less memory than MPI.Hyperthreading may be enabled if using shared memory but it is not recommended.
Shared memory run with user defined function (fortran or C).
Function will be compiled at start of run.
You may need to chance the function suffix if you usually compile on windows.
Multiple processes each with a single thread.
Not limited to one node.
Each task could be running on a different node leading to increased communication overhead
This is the default method if
The GPU nodes are limited to 16 CPUs
In order for the GPUs to be worthwhile, you should see a speedup equivalent to 56 CPU's per GPU used. GPU modes will generally have less memory/cpus
User Defined Functions
User defined functions (UDFs) can be included on the command line with the argument
<filename> is the C or fortran source code.
Extra compiler options can be set in your local
The default compile commands are for
imkl, other compilers can be loaded with
module load, you may have to change the compile commands in your local
The ABAQUS environment file contains a number of parameters that define how the your job will run, some of these you may with to change.
These parameters are read,
../ABAQUS/SMA/site/abaqus_v6.env Set by NeSI and cannot be changed.
~/abaqus_v6.env (your home directory) If exists, will be used in all jobs submitted by you.
<working directory>/abaqus_v6.env If exists, will used in this job only.
You may want to include this short snippet when making changes specific to a job.
# Before starting abaqus
parameter=value" > "abaqus_v6.env"
# After job is finished.
Note: Hyperthreading off, testing done on small mechanical FEA model. Results highly model dependant. Do your own tests.