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

Blocksome, Michael A.; Mamidala, Amith R.

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

Patent · Tue Sep 03 00:00:00 EDT 2013

OSTI ID:1092898

Blocksome, Michael A.; Mamidala, Amith R.

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.

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Research Organization:: International Business Machines Corp., Armonk, NY (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: B554331

Assignee:: International Business Machines Corporation (Armonk, NY)

Patent Number(s):: 8,527,672

Application Number:: 12/940,300

OSTI ID:: 1092898

Country of Publication:: United States

Language:: English

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