International Business Machines Corporation

Vincent L Ip

Ali Y Duale

Shailesh Ratilal Gami

Dennis W Wittig

Theodore Joseph Bohizic

Mark H Decker

A method for a method for testing the validity of shared data in a multiprocessing system is disclosed. The method comprises receiving at a first central processing unit a list of fetch and store instructions associated with blocks in a shared memory location. The list includes a data value, a central processing unit identifier and a relative order associated with the instructions. In addition, one of the data values associated with one of the instructions was stored by a memory-to-memory, memory-to-register or register-to-memory operation. Further, one of the central processing unit identifiers associated with one of the instructions is an identifier corresponding to one of a plurality of central processing units that have access to the shared memory location including the first central processing unit. A fetch operation is performed at a block in the shared memory location from the first central processing unit. Fetched data is received at the first central processing unit in response to the performing, where the fetched data was stored by one of the plurality of central processing units. The method verifies that the fetched data conforms to a block concurrency rule in response to the list and that the fetched data conforms to a serialization rule in response to the list.

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New York, NY, United States of America

Vincent L Ip