Ibex#

To login you need to ssh into the login node. A ssh client should be installed on your workstation/laptop. For users with MacOS and Linux operating system, please open the Terminal application paste command below replacing your username for Shaheen III. For Windows users, you will need a application with ssh client installed within it. Please follow instruction in this video tutorial . Refer to Shaheen III for instructions on how to login to Shaheen III.

Logging into Ibex#

SSH command to login to Ibex CPU login node#

ssh -X username@ilogin.ibex.kaust.edu.sa

SSH command to login to Ibex GPU login node#

ssh -X username@glogin.ibex.kaust.edu.sa

Submitting your first Jobscripts#

All KSL systems use SLURM for scheduling jobs for batch processing. Ibex example jobscripts ————————— The jobscript below submits a job to SLURM for running an example workload on Ibex CPU compute nodes. Note that Ibex nodes are shared and you must specify the resources you require in terms of cores or CPUs and/or memory, and wall time.

Copy the jobscript below and paste it in a file named e.g. cpu_ibex.slurm in your home directory.#

#!/bin/bash
#SBATCH --time=00:10:00
#SBATCH --nodes=1
#SBATCH --ntasks=4

srun -n ${SLURM_NTASKS}  /bin/hostname

The above jobscript can now be submitted using the sbatch command.

sbatch cpu_ibex.slurm

For submitting a job with GPUs, the jobscript must define the number of GPUs required and on how many nodes. The example below requests two NVIDIA V100 GPUs on a single node with a total of 8 CPUs and a total of 100GB of memory.

Copy the jobscript below and paste it in a file named e.g. gpu_ibex.slurm in your home directory.#

#!/bin/bash
#SBATCH --time=00:10:00
#SBATCH --gpus=2
#SBATCH --gpus-per-node=2
#SBATCH --cpus-per-task=8
#SBATCH --ntasks=1
#SBATCH --memory=100G

module load cuda

srun -n ${SLURM_NTASKS} -c ${SLURM_CPUS_PER_TASK} nvidia-smi

The above jobscript can now be submitted using the sbatch command.

sbatch gpu_ibex.slurm

KSL has written a convenient utility called Jobscript Generator. Use this template to create a jobscript and copy-paste it in a file in your SSH terminal on Shaheen III or Ibex login nodes.

If you get an error in regarding account specification, please with the your username and error and the jobscript.