Title: Preventing messaging queue deadlocks in a DMA environment

Abstract

Embodiments of the invention may be used to manage message queues in a parallel computing environment to prevent message queue deadlock. A direct memory access controller of a compute node may determine when a messaging queue is full. In response, the DMA may generate and interrupt. An interrupt handler may stop the DMA and swap all descriptors from the full messaging queue into a larger queue (or enlarge the original queue). The interrupt handler then restarts the DMA. Alternatively, the interrupt handler stops the DMA, allocates a memory block to hold queue data, and then moves descriptors from the full messaging queue into the allocated memory block. The interrupt handler then restarts the DMA. During a normal messaging advance cycle, a messaging manager attempts to inject the descriptors in the memory block into other messaging queues until the descriptors have all been processed.

Inventors:

Blocksome, Michael A; Chen, Dong; Gooding, Thomas; Heidelberger, Philip; Parker, Jeff

Issue Date:

2014-01-14

Research Org.:

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

Sponsoring Org.:

USDOE

OSTI Identifier:

1117658

Patent Number(s):

8631086

Application Number:

12/241,514

Assignee:

International Business Machines Corporation (Armonk, NY)

Patent Classifications (CPCs):

G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

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G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

G06F15/17331 - {Distributed shared memory [DSM], e.g. remote direct memory access [RDMA]}

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DOE Contract Number:  

B554331

Resource Type:

Patent

Resource Relation:

Patent File Date: 2008 Sep 30

Country of Publication:

United States

Language:

English

Subject:

97 MATHEMATICS AND COMPUTING