Mechanism to provide reliability through packet drop detection

Details Mechanism to provide reliability through packet drop detection Mechanism to provide reliability through packet drop detection

2011-01-25

2011-01-25

Nguyen, Thu Ha T (Department: 2453)

Electrical computers and digital processing systems: multicomput

Distributed data processing

C709S208000, C370S230000, C370S231000, C370S235000, C712S001000, C718S102000, C718S108000, C719S319000

Reexamination Certificate

active

07877436

ABSTRACT:
A method and a data processing system for completing checkpoint processing of a distributed job with local tasks communicating with other remote tasks via a host fabric interface (HFI) and assigned HFI window. Each HFI window has a send count and a receive count, which tracks GSM messages that are sent from and received at the HFI window. When a checkpoint is initiated by a master task, each local task forwards the send count and the receive count to the master task. The master task sums the respective counts and then compares the totals to each other. When the send count total is equal to the receive count total, the tasks are permitted to continue processing. However, when the send count total is not equal to the receive count total, the master task notifies each task of the job to rollback to a previous checkpoint or kill the job execution.

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patent: 7631128 (2009-12-01), Sgrosso et al.
patent: 2008/0069125 (2008-03-01), Reed et al.

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