sim3x

2.  Motivation

   One of the main reasons for using UUIDs is that no centralized
   authority is required to administer them (although one format uses
   IEEE 802 node identifiers, others do not).  As a result, generation
   on demand can be completely automated, and used for a variety of
   purposes.  The UUID generation algorithm described here supports very
   high allocation rates of up to <b>10 million per second per machine</b> if
   necessary, so that they could even be used as transaction IDs