bash script to max out cp load

cpu_load.sh

#! /usr/bin/env bash

function cpuConsumingFunc {
  echo 'worker started'
  dd if=/dev/urandom | bzip2 -9 >> /dev/null;
}

function fulload {
    x=0
    while [ $x -lt $1 ]; do
        cpuConsumingFunc &
        let x=x+1
    done
};

echo "----- Starting CPU load"
fulload $1;
echo "Press enter to stop CPU load"
read;
echo "----- CPU load stopped"
killall dd