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Fencing direct memory access data transfers in a parallel active messaging interface of a parallel computer

United States Patent

8,527,672
September 3, 2013
View the Complete Patent at the US Patent & Trademark Office
Fencing direct memory access (`DMA`) data transfers in a parallel active messaging interface (`PAMI`) of a parallel computer, the PAMI including data communications endpoints, each endpoint including specifications of a client, a context, and a task, the endpoints coupled for data communications through the PAMI and through DMA controllers operatively coupled to segments of shared random access memory through which the DMA controllers deliver data communications deterministically, including initiating execution through the PAMI of an ordered sequence of active DMA instructions for DMA data transfers between two endpoints, effecting deterministic DMA data transfers through a DMA controller and a segment of shared memory; and executing through the PAMI, with no FENCE accounting for DMA data transfers, an active FENCE instruction, the FENCE instruction completing execution only after completion of all DMA instructions initiated prior to execution of the FENCE instruction for DMA data transfers between the two endpoints.
Blocksome; Michael A. (Rochester, MN), Mamidala; Amith R. (Yorktown Heights, NY)
International Business Machines Corporation (Armonk, NY)
12/ 940,300
20120117281
November 5, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Contract No. B554331 awarded by the Department of Energy. The Government has certain rights in this invention.