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#!/bin/bash

#SBATCH --partition medium40standard96:test        # adjust partition as needed
#SBATCH --nodes 1                        # more than 1 node can be used
#SBATCH --tasks-per-node 4096              # one task per CPU core, adjust for partition

# set memory available per core
MEM_PER_CORE=4525    # must be set to value that corresponds with partition
                     # see https://www.hlrn.de/doc/display/PUB/Multiple+concurrent+programs+on+a+single+node

# Define srun arguments:
srun="srun -n1 -N1 --exclusive --mem-per-cpu $MEM_PER_CORE"
# --exclusive     ensures srun uses distinct CPUs for each job step
# -N1 -n1         allocates a single core to each task

# Define parallel arguments:
parallel="parallel -N 1 --delay .2 -j $SLURM_NTASKS --joblog parallel_job.log"
# -N                number of argument you want to pass to task script
# -j                number of parallel tasks (determined from resources provided by Slurm)
# --delay .2        prevents overloading the controlling node on short jobs
# --resume          add if needed to use joblog to continue an interrupted run (job resubmitted)
# --joblog          creates a log-file, required for resuming

# Run the tasks in parallel
$parallel "$srun ./task.sh {1}" ::: {1..100}
# task.sh          executable(!) script with the task to complete, may depend on some input parameter
# ::: {a..b}       range of parameters, alternatively $(seq 100) should also work
# {1}              parameter from range is passed here, multiple parameters can be used with
#                  additional {i}, e.g. {2} {3} (refer to parallel documentation)