function parallel ()
{
    echo "parallel [${a_platform[*]}] executing '$@'"
    local i=0
    local e=${#a_platform[@]}
    local c;
    while [ ${i} -lt ${e} ]; do
    c=${a_platform[${i}]}
    ${@} ${c} &
    echo "parallel [${c}] [$((i+1))/${e}] started"
    i=$(( i + 1 ));
    done;
    echo "parallel [${a_platform[*]}] waiting '$@'"
    wait
}