bachelor-thesis/chapters/thesis/appendix02_timing.sh

#!/bin/bash
#

# Activate Bash Strict Mode
set -euo pipefail

main() {
    {
        echo -e "URL\tRuns\tStDev\tMin (ms)\tAvg (ms)\tMax (ms)"
        for url in ${@:2}; do
            get_statistics $url $1
        done
    } #| column -s $'\t' -t
}

get_statistics() {
    # Initialice the variables
    local min=1000000000
    local max=0
    local dur=0
    local durQ=0

    # repeat for the defined counts the url calling
    for i in $(seq 1 $2); do
        local gp=$(($(get_posts $1)/1000000)) # from ns to ms
        if [[ $gp -gt $max ]]
            then max=$gp
        fi
        if [[ $gp -lt $min ]]
            then min=$gp
        fi
        dur=$(( $dur + $gp ))
        durQ=$(( $durQ + $(($gp * $gp)) ))
    done

    local avg=$(($dur/$2))
    local avgPow=$(($avg * $avg))
    local stdev=$( echo "sqrt(($durQ / $2) - $avgPow)" | bc )

    # output the statistic values
    echo -e "$1\t$2\t$stdev\t$min\t$avg\t$max"
}

get_posts() {
    # Call the url with measure time
    local start=$(date +%s%N)
    curl --silent --show-error $1 > /dev/null
    local stop=$(date +%s%N)
    local dur=$(($stop-$start))
    echo $dur
}

# the main domain
hostname="https://briefedition.wedekind.h-da.de"

# the Array of the Urls
url_arr=(
    "$hostname/index.xhtml"
    "$hostname/view/document/list.xhtml"
    "$hostname/view/correspondent/list.xhtml"
    "$hostname/view/person/list.xhtml"
)
 
# Execute all the URLs for 10 rounds
main 10 ${url_arr[@]}