Data merging method and apparatus for shared memory multiprocess

Details Data merging method and apparatus for shared memory multiprocess Data merging method and apparatus for shared memory multiprocess

1996-11-25

1998-01-20

Harvey, Jack B.

3952003, 39520043, 39520044, 395523, 395474, G06F 1200

Patent

active

057108811

ABSTRACT:
In a shared memory multiprocessing computer system, multiple processors can cache copies of a shared data block in their local cache memories and independently modify their cached copies. The cached copies are later merged in a global memory with the shared data block. With each cached copy, a bitmask consisting of a plurality of flags associated with elements of the cached copy also is stored in the local memories. A local memory controller tracks which elements of the cached copies are modified by setting the bitmask flags associated with such elements. When merging, only modified elements of the cached copies are stored in the originating data block as indicated by the bitmask flags.

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Karp et al., "Data Merging for Shared Memory Multiprocessors", HP Laboratories Technical Report, Nov., 1992, pp. 1-21.

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