By Robert Courts
Communications of the ACM,
September 1988,
Vol. 31 No. 9, Pages 1128-1138
10.1145/48529.48536
Comments
Modern Lisp systems make heavy use of a garbage-collecting style of memory management. Generally, the locality of reference in garbage-collected systems has been very poor. In virtual memory systems, this poor locality of reference generally causes a large amount of wasted time waiting on page faults or uses excessively large amounts of main memory. An adaptive memory management algorithm, described in this article, allows substantial improvement in locality of reference. Performance measurements indicate that page-wait time typically is reduced by a factor of four with constant memory size and disk technology. Alternately, the size of memory typically can be reduced by a factor of two with constant performance.
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