Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Patent
1997-02-03
1999-09-07
Swann, Tod R.
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
711147, G06F 1300
Patent
active
059502282
ABSTRACT:
In a distributed shared memory system, clusters of symmetric multi-processors are connected to each other by a network. Each symmetric multi-processor includes a plurality of processors, a memory having addresses, and an input/output interface to interconnect the processors. A software implemented method enables data sharing between the clusters of symmetric multi-processors using variable sized quantities of data called blocks. A set of the addresses of the memories are designated as virtual shared addresses to store shared data, and a portion of the virtual shared addresses are allocated to store a shared data structure as one or more blocks. The size of a particular allocated block can vary for different shared data structures. Each block includes an integer number of lines, and each line includes a predetermined number of bytes of shared data. Directory information of a particular block is stored in the memory of a processor designed as the home of the block. The directory information includes the size of the particular block, the identity of the processor that last modified the data in the particular block and the identity of all processors having a copy of the block.
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Yeung,Donald and Kubiatowicz, John and Agarwal, Anant; Laboratory for Computer Science, MIT, 1996; MGS: A Multigrain Shared Memory System, pp. 1-4.
Erlichson, Andrew and Nuckolls, Neal and Chesson, Greg and Hennessy, John, Computer Systems Lab, Stanford U and Silicon Graphics, Inc., Mt. View, CA; 1996; SoftFLASH: Analyzing the Performance of Clustered Distributed Virtual Shared Memory, p. 11.
Aggarwal Anshu
Gharachorloo Kourosh
Scales Daniel J.
Cesari Robert A.
Digital Equipment Corporation
Langjahr David
Swann Tod R.
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