function usage {
        echo "$0 [duration(s)] [concurrency]"
        exit 1
}

if [ $# != 2 ] ; then
        usage
        exit 1;
fi

duration=$1
concurrency=$2

f1="1byte_"$concurrency".txt"
echo $f1
f2="0.4k_"$concurrency".txt"

./test_8c.sh $f1 $duration $concurrency 1byte_file 10000 2>&1 &
pid1=$!
./test_8c.sh $f2 $duration $concurrency 410byte_file 10004 2>&1 &
pid4=$!
wait -f $pid1
wait -f $pid2
printf "[OK]\n"