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# Slurm

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Slurm (also referred as Slurm Workload Manager or slurm-llnl) is an open-source workload manager designed for Linux clusters of all sizes, used by many of the world's supercomputers and computer clusters. It provides three key functions. First it allocates exclusive and/or non-exclusive access to resources (computer nodes) to users for some duration of time so they can perform work. Second, it provides a framework for starting, executing, and monitoring work (typically a parallel job) on a set of allocated nodes. Finally, it arbitrates contention for resources by managing a queue of pending work.

## Installation

Install the slurm-llnlAUR package found in the AUR. It pulls in mungeAUR, an authentication service, as a dependency. It is started as a requirement through slurmd's systemd service and encrypts the connection between the various hosts. Therefore make sure that all nodes in your cluster have the same key in `/etc/munge/munge.key`.

The package itself has many more optional dependencies, though Slurm has to be recompiled to make use of them, after they have been installed.

## Setup

The configuration files for slurm-llnl reside under `/etc/slurm-llnl`. Prior to starting any slurm-services, it has to be configured properly by creating a config file at `/etc/slurm-llnl/slurm.conf`. Client and server may use the same configuration file, which can either be generated at the official website or by copying `/etc/slurm-llnl/slurm.conf.example` to `/etc/slurm-llnl/slurm.conf` and adapting it to ones liking.

By default the Slurm user, which was introduced to your system in the installation process, has `64030` as UID and GID, this simplifies the setup on multiple systems. UID and GID matches the one used in Debian, therefore they may be used side-by-side, but remember that binaries are not in the same directories on each and every distribution.

### Client (compute node) configuration

On the client-side one may now safely start/enable `slurmd.service`.

### Server (head node) configuration

Start/enable `slurmctld.service`.

Additionally you may want to start/enable `slurmdbd.service`, which handles a SQL database for easier management thereby logging somewhat essential process information.

Note: Additional arguments may be passed to the program by adapting `/etc/default/slurm-llnl` though still utilizing the power of systemd. This file is handled as the environment file for the various services and simply passes any arguments on to the program.

## See also

- Slurm tutorials — Introduction to the Slurm Workload Manager for users and system administrators, plus some material for Slurm programmers
- Quick Start Administrator Guide — Getting started guide
- Slurm to manage jobs — Convenient Slurm Commands
- Running Jobs — How Slurm is used at Harvard university

Category:

- Distributed computing