Browse Prior Art Database

Encoded Exclusive Data for Multiprocessing System

IP.com Disclosure Number: IPCOM000079700D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Nielsen, RE: AUTHOR

Abstract

In a multiprocessing system where each of several processors operate independently on data contained in Its associated cache, the integrity of the data may be maintained by broadcasting to the other processors that one processor has modified a block of data. Performance may be improved by preventing a broadcast where a processor's cache contains the exclusive copy of the data.

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Encoded Exclusive Data for Multiprocessing System

In a multiprocessing system where each of several processors operate independently on data contained in Its associated cache, the integrity of the data may be maintained by broadcasting to the other processors that one processor has modified a block of data.

Performance may be improved by preventing a broadcast where a processor's cache contains the exclusive copy of the data.

Table 1 describes the use of two bits, S and V, to detect when a cache contains the exclusive copy of a data block, D1. The flow chart provides a general indication of the logic decisions and sequences which must be made, in order to prevent First Store broadcasts based on a two processor system.

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