Multiprocessor system having distributed shared resources and dynamic and selective global data replication
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United States of America Patent
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Dec 28, 1993
Grant Date -
N/A
app pub date -
Feb 25, 1991
filing date -
Mar 19, 1990
priority date (Note) -
Expired
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Abstract
Multiprocessor system having distributed shared resources and dynamical and selective global data replication in which a plurality of processors communicate each with the other through a sytem bus. Each CPU is provided with a local memory storing data used locally and global data shareable by a plurality of processes operative in differing CPUs and therefore replicated in the local memory of each CPU. The global data replication is performed, at page level, only when a global data page is effectively needed by a plurality of processes operative in differing CPUs and in those CPUs where the page is needed, the replication in the other CPUs being performed in a predetermined trash page of the local memory so that memory space required for replication is minimized, as is traffic on the system bus for global data replication and global data writes required for assuring global data consistency.
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