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Title: State recovery and lockstep execution restart in a system with multiprocessor pairing

System, method and computer program product for a multiprocessing system to offer selective pairing of processor cores for increased processing reliability. A selective pairing facility is provided that selectively connects, i.e., pairs, multiple microprocessor or processor cores to provide one highly reliable thread (or thread group). Each paired microprocessor or processor cores that provide one highly reliable thread for high-reliability connect with a system components such as a memory "nest" (or memory hierarchy), an optional system controller, and optional interrupt controller, optional I/O or peripheral devices, etc. The memory nest is attached to a selective pairing facility via a switch or a bus. Each selectively paired processor core is includes a transactional execution facility, whereing the system is configured to enable processor rollback to a previous state and reinitialize lockstep execution in order to recover from an incorrect execution when an incorrect execution has been detected by the selective pairing facility.
Authors:
; ;
Publication Date:
OSTI Identifier:
1117840
Report Number(s):
8,635,492
13/027,932
DOE Contract Number:
B554331
Resource Type:
Patent
Resource Relation:
Patent File Date: 2011 Feb 15
Research Org:
International Business Machines Corporation, Armonk, NY, USA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING