#!/bin/bash

# Author: Steve Barnes (steve@echo.id.au)

# A simple mpstat test to verify cpu load is being measured

t_Log "Running $0 - a simple mpstat test to verify cpu load is being measured"

output_file=$(mktemp)

trap "rm -f ${output_file}" EXIT

n_cpu=$(nproc)

load=$((${n_cpu}/2))

if [ "${load}" -eq 0 ]; then

 load=1

fi

/usr/bin/mpstat 1 5 >${output_file} 2>&1 &

# Time for iostat booting

sleep 1

# Give the CPU something to chew on

for i in $(seq 1 ${load}); do 

  sha1sum /dev/zero &

done

# Give mpstat a chance to log our task

sleep 6

killall sha1sum

cpu_user_percent=$(awk '$4 ~ /[0-9]\./ {$4>a ? a=$4 : $4} END {print int(a)}' ${output_file})

if [ "$cpu_user_percent" -eq 0 ]; then

  t_Log "FAIL: ${0}: no cpu activity registered"

  cat ${output_file}

  t_CheckExitStatus 1

fi

t_CheckExitStatus 0