my $start_time = [Time::HiRes::gettimeofday()];
.
.
.
my ($user, $system, $child_user, $child_system) = times;
print "wall clock time was ", Time::HiRes::tv_interval($start_time), "\n",
    "user time for $$ was $user\n",
    "system time for $$ was $system\n",
    "user time for all children was $child_user\n",
    "system time for all children was $child_system\n";