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Optimized collectives using a DMA on a parallel computer

United States Patent

February 8, 2011
View the Complete Patent at the US Patent & Trademark Office
Optimizing collective operations using direct memory access controller on a parallel computer, in one aspect, may comprise establishing a byte counter associated with a direct memory access controller for each submessage in a message. The byte counter includes at least a base address of memory and a byte count associated with a submessage. A byte counter associated with a submessage is monitored to determine whether at least a block of data of the submessage has been received. The block of data has a predetermined size, for example, a number of bytes. The block is processed when the block has been fully received, for example, when the byte count indicates all bytes of the block have been received. The monitoring and processing may continue for all blocks in all submessages in the message.
Chen; Dong (Croton On Hudson, NY), Gabor; Dozsa (Ardsley, NY), Giampapa; Mark E. (Irvington, NY), Heidelberger; Phillip (Cortlandt Manor, NY)
International Business Machines Corporation (Armonk, NY)
11/ 768,645
June 26, 2007
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Contract. No. B554331 awarded by Department of Energy. The Government has certain rights in this invention.