System loadtest bash shell script that recursively forks itself. Generate CPU/memory/swap stress.

recursion_loadtest.sh

#!/bin/bash
script_name=$(basename $0)
script_version='0.1.0'
printf "* %s (%s)\n" "${script_name}" "${script_version}"
printf "System loadtest script that recursively forks itself\n"
printf "For maximum load:\n"
printf "\t * Raise maximum number of open files fs.file-max\n"
printf "\t * Raise user number of files soft/hard limits in /etc/security/limits.conf\n"
printf "**** CTRL + C to stop ****\n"
parent_process=${1:-$$}
function pkill_forks {
    set -o pipefail
    current_process=$$;
    if [[ ${current_process} == ${parent_process} ]]; then
        timeout 3 kill -15 $(pgrep "${script_name}" | grep -v ${parent_process}) 2>/dev/null || kill -9 $(pgrep "${script_name}" | grep -v ${parent_process}) 2>/dev/null & PID=$!; wait "${PID}";
        exit 0
    else
        { set +x; } 2>/dev/null
        exit 0
    fi  
}
trap pkill_forks SIGINT EXIT

$("$(CDPATH='' cd -- "$(dirname -- "$0")" && pwd -P)/${script_name}" "${parent_process}") 1>/dev/null 2>/dev/null