3.0 KiB
title, last_updated, keywords, summary, sidebar, permalink
| title | last_updated | keywords | summary | sidebar | permalink |
|---|---|---|---|---|---|
| ANSYS / CFX | 30 June 2020 | software, ansys, cfx5, cfx, slurm | This document describes how to run ANSYS/CFX in the Merlin6 cluster | merlin6_sidebar | /merlin6/ansys-cfx.html |
This document describes the different ways for running ANSYS/CFX
ANSYS/CFX
Is always recommended to check which parameters are available in CFX and adapt the below examples according to your needs.
For that, run cfx5solve -help for getting a list of options.
Running CFX jobs
PModules
Is strongly recommended the use of the latest ANSYS software ANSYS/2020R1-1 available in PModules.
module use unstable
module load ANSYS/2020R1-1
Non-interactive: sbatch
Running jobs with sbatch is always the recommended method. This makes the use of the resources more efficient. Notice that for
running non interactive Mechanical APDL jobs one must specify the -batch option.
Serial example
This example shows a very basic serial job.
#!/bin/bash
#SBATCH --job-name=CFX # Job Name
#SBATCH --partition=hourly # Using 'daily' will grant higher priority than 'general'
#SBATCH --time=0-01:00:00 # Time needed for running the job. Must match with 'partition' limits.
#SBATCH --cpus-per-task=1 # Double if hyperthreading enabled
#SBATCH --ntasks-per-core=1 # Double if hyperthreading enabled
#SBATCH --hint=nomultithread # Disable Hyperthreading
#SBATCH --error=slurm-%j.err # Define your error file
module use unstable
module load ANSYS/2020R1-1
SOLVER_FILE=/data/user/caubet_m/CFX5/mysolver.in
cfx5solve -batch -def "$JOURNAL_FILE"
One can enable hypertheading by defining --hint=multithread, --cpus-per-task=2 and --ntasks-per-core=2.
However, this is in general not recommended, unless one can ensure that can be beneficial.
MPI-based example
An example for running CFX using a Slurm batch script is the following:
#!/bin/bash
#SBATCH --job-name=CFX # Job Name
#SBATCH --partition=hourly # Using 'daily' will grant higher priority than 'general'
#SBATCH --time=0-01:00:00 # Time needed for running the job. Must match with 'partition' limits.
#SBATCH --nodes=1 # Number of nodes
#SBATCH --ntasks=44 # Number of tasks
#SBATCH --cpus-per-task=1 # Double if hyperthreading enabled
#SBATCH --ntasks-per-core=1 # Double if hyperthreading enabled
#SBATCH --hint=nomultithread # Disable Hyperthreading
#SBATCH --error=slurm-%j.err # Define a file for standard error messages
##SBATCH --exclusive # Uncomment if you want exclusive usage of the nodes
module use unstable
module load ANSYS/2020R1-1
JOURNAL_FILE=/data/user/caubet_m/CFX/myjournal.in
cfx5solve -batch -def "$JOURNAL_FILE" -part $SLURM_NTASKS
In the above example, one can increase the number of nodes and/or ntasks if needed and combine it
with --exclusive whenever needed. In general, no hypertheading is recommended for MPI based jobs.
Also, one can combine it with --exclusive when necessary.