By Joachim Beer
This monograph offers a unique execution version for the parallel execution of ordinary sequential Prolog. during this execution version Prolog process calls may be successfully pipelined, and the writer exhibits how even absolutely deterministic Prolog courses should be successfully mapped onto the proposed structure. The layout relies on a hugely optimized summary Prolog particular guideline set. a different function of this paintings is a worldly type scheme for Prolog variables which considerably reduces the overhead for unification with occur-check. To help the version an structure which include a round pipeline of self sufficient processors has been designed. This pipeline has been designed to paintings as a co-processor to a UNIX dependent notebook. not like different makes an attempt to execute sequential Prolog in parallel, the proposed version doesn't limit using any of the normal Prolog language positive aspects. The ebook provides an entire account of the execution version, the procedure structure, and the summary Prolog guideline set.
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Extra info for Concepts, Design, and Performance Analysis of a Parallel Prolog Machine
If a structure within a clause head is being bound to a variable, the structure needs to be created. However, if the structure is matched with an already existing structure no new structure is created. There is only one set of instructions (established when the clause is compiled) that represent the structure. These 'structure instructions' can be executed in two modes- 'READ' mode (create the structure) and 'WRITE' mode (match the structure with an existing one). In the proposed new model the 'structure instructions' can also be executed in a 'WRITE_SAFE' mode.
A detailed account of the processor-processor communication and their synchronization will be given later. Even though the main purpose of the pipeline buffer is to serve as a communication buffer between processors, the remaining cells not used for the transfer of control information and arguments can be used by the processors as a local scratch pad. 3 Execution Model The basic idea of the proposed parallel execution model for sequential Prolog is to execute the procedure calls in an overlapping pipeline fashion.
A1] unify V,A2 unify W,A3 stop The old environment is deallocated before the procedure to solve the last goal is invoked. This is just the definition of tail recursion optimization; however, in our paxticular execution model it might still be necessary to access the old environment to initialize the argument registers. (In this case the values of the variables X, Y, and Z - which might be part of the just deallocated environment have to be passed to the next processor). However, the next processor allocates a new environment (maybe re-using the just discarded storage space) and stores unification results in its environment, thereby potentially destroying information still needed.