Build cgroups to isolate Gatling process

[dmlemeshko]

In order to minimise potential noise while running Kibana/ES and load executor (Gatling) on the same machine, we can limit CPU number that load executor can use.

Setup might look like:

# Isolate the Gatling process to the first 2 cores (2 physical cores)
sudo cset set --set=/benchmark --cpu=0-1
sudo cset proc --exec /benchmark mvn gatling:test -q -Dgatling.simulationClass=${simulationPackage}.${simulationClass}

Cleanup should be executed in the end:

function tearDown() {
    echo "Destroying cgroups"
    sudo cset set --destroy /benchmark
​
    echo "Setting CPU powersave governor"
    for (( cpu=0; cpu<=${CORE_INDEX}; cpu++ ))
    do
        sudo cpufreq-set -c ${cpu} --min ${MIN_FREQ} --max ${MAX_FREQ} --governor=powersave
    done
}