load_server_with_gzip.sh

#!/bin/bash

function usage {
        if [ ! -z "$1" ]; then
                echo $1
        fi
        echo "$(basename $0) [-h] [-n nb_gzip_files]"
        exit 0
}

while getopts 'n:h' opt; do
        case $opt in
                n)
                        OPTSFOUND=1
                        NBGZIPFILES=${OPTARG}
                        ;;
                h)
                        OPTSFOUND=1
                        usage
                        ;;
                \?)
                        usage "Invalid option"
                        ;;
        esac
done
shift $(( $OPTIND-1 ))

if [ -z "${NBGZIPFILES}" ]; then
        NBGZIPFILES=10
fi

DDOF=file2gzip.$$
DDCMD="dd if=/dev/urandom of=${DDOF} bs=1024 count=100000"
DISKFREE=$(df -mP . | tail -n 1 | awk '{print $4}')

DISKNEEDED=$[NBGZIPFILES*100]
if ((DISKNEEDED > DISKFREE)); then
        echo "Not enough disk space ${DISKNEEDED}m required"
        df -hP .
        exit 1
fi

echo "Dumping random file"
${DDCMD} &

DDPID=$!

while [ ! -z "$(ps -eaf | grep -v grep | grep ${DDPID})" ]
 do
        kill -USR1 ${DDPID}
        echo "----------------------"
        sleep 3
 done

for ((i=0;i<NBGZIPFILES;i++))
 do
        gzip -9 ${DDOF} -c > ${DDOF}.$i.gz &
 done

while [ ! -z "$(ps -eaf | grep -v grep | grep ${DDOF})" ]
 do
        clear
        uptime
        echo "----------------------------------------------------------------------"
        ls -lh ${DDOF}.*
        sleep 5
 done

rm -f ${DDOF}*