systolic array
<architecture, parallel> (By analogy with the regular pumping of blood by
the heart) An arrangement of processors in an array (often rectangular) where
data flows synchronously across the array between neighbours, usually with
different data flowing in different directions. H. T. Kung and Charles Leiserson
publish the first paper describing systolic arrays in 1978 [reference?].
Each processor at each step takes in data from one or more neighbours (e.g.
North and West), processes it and, in the next step, outputs results in the
opposite direction (South and East).
An example of a systolic algorithm might be matrix multiplication. One matrix is
fed in a row at a time from the top of the array and is passed down the array,
the other matrix is fed in a column at a time from the left hand side of the
array and passes from left to right. Dummy values are then passed in until each
processor has seen one whole row and one whole column. At this point, the result
of the multiplication is stored in the array and can now be output a row or a
column at a time, flowing down or accross the array.
See also Ruby, SISAL.
(1998-07-01)
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