Difference between revisions of "Fluent Guide"

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(Rewrite interactive job commands. Remove unnecessary instructions line for connecting with SSH and running a serial job.)
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<!-- Administrator notes:
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`fluent -help` actually provides very limited information for command-line usage.
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The only place to read more documentation is the help in the Fluent GUI:
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So open a terminal in X2Go, load the fluent module, run `fluent`, click on the Help button > Help on Parallel Processing > Starting Parallel ANSYS Fluent on a Linux System
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-->
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=Module File=
 
=Module File=
−
First check the available fluent module
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First check the available fluent modules
 
  module avail fluent
 
  module avail fluent
 
To load fluent version 16.2:
 
To load fluent version 16.2:
 
  module load fluent/16.2
 
  module load fluent/16.2
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−
=Run Fluent with Slurm=
 
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[[HPC Getting Started#SSH access|SSH]] into the HPC Cluster to use SLURM.
 
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==Serial Job==
 
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Create a batch script, say, fluent.sh, with something similar to:
 
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#!/bin/bash
 
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#SBATCH -n 1 # only allocate 1 task
 
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#SBATCH -J fluent1 # sensible name for the job
 
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#SBATCH -o fluent_$J.out #the file to write the stdout for fluent job
 
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#SBATCH -e fluent_%J.err #the fiel to write the stderr for fluent job
 
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export FLUENT_GUI=off
 
−
 
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fluent 2d -g -i foo.txt
 
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Then, submit the job as:
 
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sbatch<fluent.sh
 
  
 
==Parallel Job==
 
==Parallel Job==
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  #!/bin/bash
 
  #!/bin/bash
 
  #SBATCH -N 2 # allocate 2 nodes for the job
 
  #SBATCH -N 2 # allocate 2 nodes for the job
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  #SBATCH -n 40 # total number of tasks. Or you can specify number of tasks per node as "#SBATCH --ntasks-per-node=20"
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  #SBATCH --ntasks-per-node=20
 
  #SBATCH --exclusive # no other jobs on the nodes while job is running
 
  #SBATCH --exclusive # no other jobs on the nodes while job is running
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#SBATCH -J fluentP1 # sensible name for the job
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  #SBATCH -o fluentP_$J.out # the file to write stdout for fluent job
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  #SBATCH -o fluentP_$J.out #the file to write the stdout for fluent job
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  #SBATCH -e fluentP_%J.err # the file to write stderr for fluent job
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  #SBATCH -e fluentP_%J.err #the fiel to write the stderr for fluent job
 
 
   
 
   
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export FLUENT_GUI=off
 
 
  if [ -z "$SLURM_NPROCS" ]; then
 
  if [ -z "$SLURM_NPROCS" ]; then
 
   N=$(( $(echo $SLURM_TASKS_PER_NODE | sed -r 's/([0-9]+)\(x([0-9]+)\)/\1 * \2/') ))
 
   N=$(( $(echo $SLURM_TASKS_PER_NODE | sed -r 's/([0-9]+)\(x([0-9]+)\)/\1 * \2/') ))
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  # run fluent in batch on the allocated node(s)
 
  # run fluent in batch on the allocated node(s)
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  fluent 2ddp -g -slurm -t$N -pnmpi -ssh -i foo.txt
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  fluent <span style=color:red>2ddp</span> -g -slurm -t$N -pnmpi -ssh -i <span style=color:red>foo.txt</span>
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Then, submit your job as:
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  sbatch< fluentP.sh
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Make sure to replace <span style=color:red>foo.txt</span> in the last line with the name of your job file.
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Then, submit your job with:
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  sbatch fluentP.sh
  
 
==Interactive Job==
 
==Interactive Job==
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For an interactive run of the Fluent, you can use this simple script, fluent-srun.sh:
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#!/bin/bash
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Start the interactive session on 1 node with 12 CPUs with fisbatch:
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HOSTSFILE=.hostlist-job$SLURM_JOB_ID
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fisbatch -N 1 -n 12 -p Westmere
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if [ "$SLURM_PROCID" == "0" ]; then
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    srun hostname -f > $HOSTSFILE
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The first parameter to fluent is the version (namely, <span style=color:red>2ddp</span> below).
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    fluent -t $SLURM_NTASKS -cnf=$HOSTSFILE -ssh 3d
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The version can be either 2d, 3d, 2ddp, or 3ddp; change it to whatever you need.
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    rm -f $HOSTSFILE
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The "dp" stands for "double precision".
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fi
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exit 0
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Run fluent with:
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To run an interactive session, use srun like this:
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$ srun -n <#procs> ./fluent-srun.sh
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fluent <span style=color:red>2ddp</span> -g -t $SLURM_NTASKS
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Type "exit" to end the session.
  
 
[[Category:Software]]
 
[[Category:Software]]

Revision as of 13:29, 2 March 2016


Module File

First check the available fluent modules 

module avail fluent

To load fluent version 16.2: 

module load fluent/16.2

Parallel Job

To run several tasks in parallel on one or more nodes, here is an example fluentP.sh batch script: 

#!/bin/bash
#SBATCH -N 2 # allocate 2 nodes for the job
#SBATCH --ntasks-per-node=20
#SBATCH --exclusive # no other jobs on the nodes while job is running
#SBATCH -o fluentP_$J.out # the file to write stdout for fluent job
#SBATCH -e fluentP_%J.err # the file to write stderr for fluent job

if [ -z "$SLURM_NPROCS" ]; then
  N=$(( $(echo $SLURM_TASKS_PER_NODE | sed -r 's/([0-9]+)\(x([0-9]+)\)/\1 * \2/') ))
else
  N=$SLURM_NPROCS
fi

echo -e "N: $N\n";

# run fluent in batch on the allocated node(s)
fluent 2ddp -g -slurm -t$N -pnmpi -ssh -i foo.txt

Make sure to replace foo.txt in the last line with the name of your job file.

Then, submit your job with: 

sbatch fluentP.sh

Interactive Job

Start the interactive session on 1 node with 12 CPUs with fisbatch: 

fisbatch -N 1 -n 12 -p Westmere

The first parameter to fluent is the version (namely, 2ddp below). The version can be either 2d, 3d, 2ddp, or 3ddp; change it to whatever you need. The "dp" stands for "double precision".

Run fluent with: 

fluent 2ddp -g -t $SLURM_NTASKS

Type "exit" to end the session.

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