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ICLP
2009
Springer

A Tabling Implementation Based on Variables with Multiple Bindings

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A Tabling Implementation Based on Variables with Multiple Bindings
Suspension-based tabling systems have to save and restore computation states belonging to OR branches. Stack freezing combined with (forward) trailing is among the better-known implementation approaches for this purpose. Resuming a goal using this technique reinstalls the bindings for all the variables in the environment where the goal was suspended. In this paper we explore an alternative approach where variables can keep track of several bindings, associated with suspensions. Resuming a goal boils down to determining which suspension has to be resumed, in order to select, when dereferencing, the bindings which were active at the moment of suspending. We present the ideas behind this approach, highlight several advantages over other suspension-based implementations, and perform an experimental evaluation. We also recall the similarity between OR-parallelism and suspension-based implementations of tabling, and discuss similarities with the Version Vectors Method, among others.
Pablo Chico de Guzmán, Manuel Carro, Manuel
Added 22 Nov 2009
Updated 22 Nov 2009
Type Conference
Year 2009
Where ICLP
Authors Pablo Chico de Guzmán, Manuel Carro, Manuel V. Hermenegildo
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