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1. The Free On-line Dictionary of Computing (30 December 2018)
data flow

    A data flow architecture or language performs a
   computation when all the operands are available.  Data flow is
   one kind of data driven architecture, the other is demand
   driven.  It is a technique for specifying fine-grain
   concurrency, usually in the form of two-dimensional graphs in
   which instructions that are available for concurrent execution are
   written alongside each other while those that must be executed in
   sequence are written one under the other.  Data dependencies
   between instructions are indicated by directed arcs.  Instructions
   do not reference memory since the data dependence arcs allow data
   to be transmitted directly from the producing instruction to the
   consuming one.

   Data flow schemes differ chiefly in the way that they handle
   re-entrant code.  Static schemes disallow it, dynamic
   schemes use either "code copying" or "tagging" at every point
   of reentry.

   An example of a data flow architecture is MIT's VAL
   machine.


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