Creating a Apptainer image 

NOTE, you need to be root to do this. Therefore you probably want to do this on your own machine.

Recipe for building a container

# Header
Bootstrap: docker        # container base from docker
From: ubuntu:18.04       # which version of the base image

Best-practice for reproducibility is not to use latest but to always specify which OS version to be pulled

Using the different parts of Kebnekaise

Since Kebnekaise consists of several different node types using them correctly takes a bit of getting used to.

Batch system examples

We have made a few examples of how to use the batch system, both from the command line and through a batch submit file.

Overview of the Batch system examples subpages:

Connecting from Linux/Unix

If you are connecting to HPC2N from a computer running Linux or Unix, you have a number of options. The most obvious and commonly used one is probably the built-in SSH client SSH. Several others exist, here are some of the more common ones:

Using the Intel Xeon Phi 7250 (KNL) nodes

Intel Xeon Phi x200, codename Knights Landing (KNL), is second generation MIC architecture product from Intel. At HPC2N 36 nodes, as a part of Kebnekaise, are equipped with Intel Xeon Phi 7250 CPUs. See our description of Intel Knight Landing for more information about the nodes.

At a high level there are three key aspects to achieving code performance on KNL:

Slurm GPU Resources (Kebnekaise)

NOTE: your project need to have time on the GPU nodes to use them, as they are considered a separate resource now. To use them you use the SLURM command mentioned below. For V100s there is no specific partition you need to give, but there is for the A100s - see below.

We have two types of GPU cards available on Kebnekaise, NVIDIA Tesla V100 (Volta) and NVIDIA A100 (Ampere).

To request GPU resources one has to include a GRES in the submit file. The general format is: