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Slurm Usage

**Quick Introduction**

A queue in Slurm is called a partition. User commands are prefixed with s.

**Useful Commands**

- sacct, sbatch, sinfo, sprio, squeue, srun, sshare, sstate, etc.
- sbatch: sends jobs to the Slurm queue
- sinfo: general info about Slurm
- squeue: inspect queue
- sinfo -lNe: more detailed info reporting with long format and nodes listed individually
- scancel 22: cancel job 22
- scontrol show job 2: show control info on job 2

**Examples:**

\# find the queue names:  
\[user@computer ~\]$ sinfo  
PARTITION AVAIL TIMELIMIT NODES STATE NODELIST  
basic\* up infinite 1 idle

\# test a job submission (don't run)  
sbatch --test-only slurm\_test.sh

\# run a job  
sbatch slurm\_test.sh

**Example Slurm job file:**

\#!/bin/bash  
\## SLURM REQUIRED SETTINGS  
\#SBATCH --partition=basic  
\#SBATCH --nodes=1  
\#SBATCH --ntasks=1  
\#SBATCH --cpus-per-task=1

\## SLURM reads %x as the job name and %j as the job ID  
\#SBATCH --output=%x-%j.out  
\#SBATCH --error=%x-%j.err

\# Output some basic info with job  
pwd; hostname; date;

\# requires ED2\_HOME env var to be set  
cd $ED2\_HOME/run

\# Job to run  
./ed2

**Another Example:**

\#!/bin/bash  
\#  
\#SBATCH -p basic # partition name (aka queue)  
\#SBATCH -c 1 # number of cores  
\#SBATCH --mem 100 # memory pool for all cores  
\#SBATCH -t 0-2:00 # time (D-HH:MM)  
\#SBATCH -o slurm.%N.%j.out # STDOUT  
\#SBATCH -e slurm.%N.%j.err # STDERR

\# code or script to run  
for i in {1..100000}; do  
echo $RANDOM >> SomeRandomNumbers.txt  
donesort SomeRandomNumbers.txt

**Python Example:**

The output goes to a file in your home directory called hello-python-\*.out, which should contain a message from Python.

\#!/bin/bash

\## SLURM REQUIRED SETTINGS1G  
\#SBATCH --nodes=1  
\#SBATCH --ntasks=1  
\#SBATCH --cpus-per-task=1

\## SLURM reads %x as the job name and %j as the job ID  
\#SBATCH --output=%x-%j.out  
\#SBATCH --error=%x-%j.err

\#SBATCH --job-name=hello-python # create a short name for your job  
\#SBATCH --time=00:01:00 # total run time limit (HH:MM:SS)

\## Example use of Conda:

\# first source bashrc (with conda.sh), then conda can be used  
source ~/.bashrc

\# make sure conda base is activated  
conda activate

\# Other conda commands go here

\## run python  
python hello.py

hello.py should be something like this:

print('Hello from Python!')

**Computer Facts:**

Find out facts about the computer for the job file

\# number of cores?  
grep 'cpu cores' /proc/cpuinfo | uniq

\# memory  
\[emery@bellows ~\]$ free -h
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