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Synchronizing compute node time bases in a parallel computer

United States Patent

January 27, 2015
View the Complete Patent at the US Patent & Trademark Office
Synchronizing time bases in a parallel computer that includes compute nodes organized for data communications in a tree network, where one compute node is designated as a root, and, for each compute node: calculating data transmission latency from the root to the compute node; configuring a thread as a pulse waiter; initializing a wakeup unit; and performing a local barrier operation; upon each node completing the local barrier operation, entering, by all compute nodes, a global barrier operation; upon all nodes entering the global barrier operation, sending, to all the compute nodes, a pulse signal; and for each compute node upon receiving the pulse signal: waking, by the wakeup unit, the pulse waiter; setting a time base for the compute node equal to the data transmission latency between the root node and the compute node; and exiting the global barrier operation.
Chen; Dong (Croton on Hudson, NY), Faraj; Daniel A. (Rochester, MN), Gooding; Thomas M. (Rochester, MN), Heidelberger; Philip (Cortlandt Manor, NY)
International Business Machines Corporation (Armonk, NY)
13/ 693,894
December 4, 2012
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.