class Benchmark::Tms

user, system and real elapsed time.
If +format+ is not given, FORMAT is used as default value, detailing the

%n:: Replaced by the label string, as reported by Tms#label (Mnemonic: n of "*n*ame")
%r:: Replaced by the elapsed real time, as reported by Tms#real
%t:: Replaced by the total CPU time, as reported by Tms#total
%Y:: Replaced by the children's system CPU time, as reported by Tms#cstime
%U:: Replaced by the children's user CPU time, as reported by Tms#cutime
%y:: Replaced by the system CPU time, as reported by #stime (Mnemonic: y of "s*y*stem")
%u:: Replaced by the user CPU time, as reported by Tms#utime.

accepts the following extensions:
like that passed to Kernel.format. In addition, #format
a formatted string, according to a +format+ string
Returns the contents of this Tms object as

def format(format = nil, *args)
  str = (format || FORMAT).dup
  str.gsub!(/(%[-+.\d]*)n/) { "#{$1}s" % label }
  str.gsub!(/(%[-+.\d]*)u/) { "#{$1}f" % utime }
  str.gsub!(/(%[-+.\d]*)y/) { "#{$1}f" % stime }
  str.gsub!(/(%[-+.\d]*)U/) { "#{$1}f" % cutime }
  str.gsub!(/(%[-+.\d]*)Y/) { "#{$1}f" % cstime }
  str.gsub!(/(%[-+.\d]*)t/) { "#{$1}f" % total }
  str.gsub!(/(%[-+.\d]*)r/) { "(#{$1}f)" % real }
  format ? str % args : str
end