times - return elapsed time for self and child processes
times
The times
function returns elapsed realtime since some point in the past (such as
system startup), user and system times for this process, and user and
system times used by child processes. All times are returned in clock
ticks.
($realtime, $user, $system, $cuser, $csystem) = POSIX::times();
Note: Perl's builtin times function returns four values, measured in seconds.