Using an X11 Virtual Frame Buffer to run GUI jobs in batch mode on the HPC.

#!/bin/bash
#SBATCH --time=00:10:00
#SBATCH --ntasks=1
#SBATCH --cpus-per-task=16
#SBATCH --mem=10G
#SBATCH --job-name Pandemic-OpenMP

cd ${SLURM_SUBMIT_DIR}

# Have X11 find an open display number and communicate the number
# though a temporary file to set the environment variable.
display_file=.tmp_display.txt
Xvfb -displayfd 1 -auth /dev/null  1>$display_file 2> /dev/null &
sleep 5
export DISPLAY=:`cat $display_file`
echo "DISPLAY set to $DISPLAY"
rm $display_file

# Benchmark program with different numbers of processes
export OMP_NUM_THREADS=16
time ./Pandemic.c-openmp
export OMP_NUM_THREADS=8
time ./Pandemic.c-openmp
export OMP_NUM_THREADS=4
time ./Pandemic.c-openmp
export OMP_NUM_THREADS=2
time ./Pandemic.c-openmp
export OMP_NUM_THREADS=1
time ./Pandemic.c-openmp
echo done

# Report job statistics
scontrol show job $SLURM_JOB_ID

#!/bin/bash
#SBATCH --time=00:10:00
#SBATCH --ntasks=16
#SBATCH --cpus-per-task=1
#SBATCH --mem=10G
#SBATCH --job-name Pandemic-MPI

cd ${SLURM_SUBMIT_DIR}
module swap GNU Intel
module load OpenMPI

# Have X11 find an open display number and communicate the number
# though a temporary file to set the environment variable.
display_file=.tmp_display.txt
Xvfb -displayfd 1 -auth /dev/null  1>$display_file 2> /dev/null &
sleep 5
export DISPLAY=:`cat $display_file`
echo "DISPLAY set to $DISPLAY"
rm $display_file

# Benchmark program with different numbers of processes
time mpirun -n 16 -x DISPLAY=$HOSTNAME:$DISPLAY ./Pandemic.c-mpi
time mpirun -n 8 -x DISPLAY=$HOSTNAME$DISPLAY ./Pandemic.c-mpi
time mpirun -n 4 -x DISPLAY=$HOSTNAME$DISPLAY ./Pandemic.c-mpi
time mpirun -n 2 -x DISPLAY=$HOSTNAME$DISPLAY ./Pandemic.c-mpi
time mpirun -n 1 -x DISPLAY=$HOSTNAME$DISPLAY ./Pandemic.c-mpi

# Report job statistics
scontrol show job $SLURM_JOB_ID